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Academic literature on the topic 'Tensile tests'

Author: Grafiati

Published: 4 June 2021

Last updated: 19 October 2024

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Journal articles on the topic "Tensile tests"

Liu, Jie, Gangyuan Jiang, Taoying Liu, and Qiao Liang. "The Influence of Loading Rate on Direct and Indirect Tensile Strengths: Laboratory and Numerical Methods." Shock and Vibration 2021 (November 29, 2021): 1–17. http://dx.doi.org/10.1155/2021/3797243.

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To investigate different responses of direct and indirect tensile strengths to loading rate, direct and indirect tension tests were performed on sandstone, rust stone, and granite specimens. Typical load curves indicate that a peak tensile stress frequently appears before the second peak stress, used to calculate the tensile strength in indirect tension tests. As expected, increase in the loading rate increases the tensile strength. In addition, the calculated tensile strengths of the indirect tension tests are frequently higher. Interestingly, the increase ratio of the tensile strength with the increase in the loading rate in indirect tension tests is higher. To verify the above results, crack propagation and stress evolution in direct and indirect tension tests were dynamically monitored using PFC 3D. For direct tension tests, specimens fail at the peak tension point, corresponding to the tensile strength. However, for indirect tension tests, minor cracks, composing of continuous microcracks, form before the peak stress and accompany with the decreased slope of the compression curve. At the peak point, tensile stresses significantly concentrate at the crack tips and further cause large-scale crack propagation. In addition, the initiation stress instead of the peak tensile stress is closer to the tensile strength, obtained from the direct tests for the same loading rate.

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HAYASHI, Takeharu, Yoshinori EBIHARA, Hirohiko WATANABE, and Tatsuhiko ASAI. "Attempt to Stability Improvement on FEA of Tensile Tests, Tension-Compression Tests and Stress Relaxation Tests." Journal of Smart Processing 4, no. 4 (2015): 207–14. http://dx.doi.org/10.7791/jspmee.4.207.

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Szeliga, Danuta, Jerzy Gawad, Maciej Pietrzyk, and Roman Kuziak. "Inverse Analysis of Tensile Tests." steel research international 76, no. 11 (November 2005): 807–14. http://dx.doi.org/10.1002/srin.200506099.

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Gassaa, Ramzi, Larbi Hemmouche, Riad Badji, Lionel Gilson, Luc Rabet, and Oussama Mimouni. "Effect of rotational speed and copper interlayer on the mechanical and fracture behaviour of friction stir spot welds of 5754 aluminium alloy." Metallurgical Research & Technology 120, no. 1 (2023): 118. http://dx.doi.org/10.1051/metal/2023014.

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The application of joining processes requires advanced mechanical tests to control the joints’ quality. Generally, welded sheets are verified using tensile shear tests. However, few studies also recommend conducting tension peel and cross-tension tests. The present work evaluates the mechanical behaviour of 5754 aluminium sheets jointed by friction stir spot welding (FSSW). The influence of the rotational speed on joint strength was first compared to riveted assemblies. Then, sheets welded with pure copper interlayers were compared to the precedents. The results indicated that, without an interlayer, lower and intermediate rotational speeds lead to higher mechanical strength under tensile shear tests compared to riveted assembly. However, it performed worse under tension peel and cross-tension tests at all studied rotational speeds. By adding copper, the strength of welded sheets is globally improved under tensile shear tests. Nevertheless, under tension peel and cross-tension tests, it performed worse, although a slight improvement was observed for increasing rotational speeds. Two different failure morphologies and four fracture modes were observed regarding the different tested samples. Microhardness tests were also conducted, to relate the influence of the studied parameters on the joint’s strength.

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Urriolagoitia-Sosa, G., J. F. Durodola, and N. A. Fellows. "Determination of Tensile and Compressive Stress Strain Curves from Bend Tests." Applied Mechanics and Materials 1-2 (September 2004): 133–38. http://dx.doi.org/10.4028/www.scientific.net/amm.1-2.133.

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A new inverse method has been developed for the simultaneous derivation of tensile and compressive stress strain behaviour from bending tests only. This new procedure can be applied to materials having asymmetric tensile and compressive stress strain behaviour and also materials that have been previously strain hardened (Bauschinger Effect). This paper presents results obtained using the new method and compares them with experimentally obtained tensile and compressive stress strain curves. The agreement of the derived stress strain data in tension and compression is encouraging.

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Stanciu, Mariana Domnica, Horațiu Teodorescu Drăghicescu, and Ioan Călin Roșca. "Mechanical Properties of GFRPs Exposed to Tensile, Compression and Tensile–Tensile Cyclic Tests." Polymers 13, no. 6 (March 15, 2021): 898. http://dx.doi.org/10.3390/polym13060898.

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Currently there are many applications for the use of composites reinforced with fiberglass mat and fabrics with polyester resin: automotive, aerospace, construction of wind turbines blades, sanitary ware, furniture, etc. The structures made of composites have a complex geometry, can be simultaneously subjected to tensile–compression, shear, bending and torsion. In this paper we analyzed the mechanical properties of a polyester composite material reinforced with glass fiber (denoted GFRP) of which were carried out two types of samples: The former contains four layers of plain fabric (GFRP-RT500) and the second type contains three layers of chopped strand mat (GFRP-MAT450). The samples were subjected to tensile, compression and tensile–tensile cyclic loading. The results highlight the differences between the two types of GFRP in terms of initial elastic modulus, post yield stiffness and viscoelastic behavior under cyclic loading. Thus, it was observed that the value of the modulus of elasticity and the value of ultimate tensile stress are approximately twice higher in the case of GFRP-RT500 than for the composite reinforced with short fibers type GFRP-MAT450. The tensile–tensile cyclic test highlights that the short glass fiber-reinforced composite broke after the first stress cycle, compared to the fabric-reinforced composite in which rupture occurred after 15 stress cycles. The elasticity modulus of GFRP-RT500 decreased by 13% for the applied loading with the speed of 1 mm/min and by 15% for a loading speed of 20 mm/min.

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Kobayashi, Hidetoshi, Masashi Daimaruya, Osamu Shiozaki, and Yuji Yabe. "Lateral Compression Tests and Tensile Tests for Ceramic Tubes." Transactions of the Japan Society of Mechanical Engineers Series A 61, no. 588 (1995): 1797–803. http://dx.doi.org/10.1299/kikaia.61.1797.

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Hagengruber, Tyler, Mahmoud Reda Taha, Esteban Rougier, Earl Knight, and John Stormont. "Failure in Confined Brazilian Tests on Sandstone." Applied Sciences 11, no. 5 (March 4, 2021): 2285. http://dx.doi.org/10.3390/app11052285.

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Strength of rocks in the confined tension region, where the minimum principal stress is tensile, has only infrequently been measured and is not well understood. Quasi-static confined Brazilian tests under a range of confining stresses (2.76 to 27.58 MPa) where used to determine the strength of sandstone in the confined tension region. The test results indicate that the strength in the confined tension region was a strong function of the intermediate principal stress: increasing the intermediate principal stress significantly increased the strength of the sandstone. The strength data were well fit by the Mogi–Coulomb criterion, which accounts for the intermediate principal stress. Unconfined Brazilian strength data were not well fit to the Mogi–Coulomb criterion derived from the confined Brazilian test data, consistent with a transition from tensile to shear processes dominating failure with increasing confining pressure. Observations of post-failure fracture surfaces reveal more indication of shear processes with increasing confining pressure. Numerical simulations from combined finite-discrete element method are compared to the experimental results and reflect similar conditions for failure compared to the experimental tests in the confined tension region.

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Zhang, Longfei, Xiang Lan, Kechuan Wu, and Wenzheng Yu. "Tests and Seismic Response Analysis of Guided-Rail-Type Anti-Tensile Rubber Bearing." Buildings 14, no. 4 (April 3, 2024): 992. http://dx.doi.org/10.3390/buildings14040992.

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When subjected to seismic activity, tall isolated buildings with a high aspect ratio are susceptible to overturning as a result of the failure of rubber isolation bearings under tension. In order to address this issue, a guided-rail tension device (GR) has been developed to enhance the tensile strength of rubber bearings. Furthermore, a novel guided-rail isolation rubber bearing (GR&RB) has been proposed as a potential solution. Quasi-static tests have been conducted to investigate the mechanical properties of the GR, as well as the GR&LNR600 and LNR600. Additionally, numerical finite element analysis has been employed to study the seismic response of the GR&RB under El Centro seismic action in a high-rise building with an aspect ratio of approximately 4. The experimental results suggest that the inclusion of GRs has a limited effect on the horizontal mechanical attributes of rubber isolation bearings. Nevertheless, it simultaneously enhances their tensile strength, demonstrating a significant augmentation of 4.23 times. Moreover, the mechanical behavior of the GR aligns with the Hook model. The numerical analysis suggests that the utilization of GR&RB can mitigate the tensile stress levels of rubber isolators. Furthermore, it is recommended to augment the elastic tensile stiffness of the GR while reducing the open value to enhance the tensile efficiency, with the potential to attain up to 75% efficiency in tensile performance.

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Nafisi, Ashkan, Douglas Mocelin, Brina M. Montoya, and Shane Underwood. "Tensile strength of sands treated with microbially induced carbonate precipitation." Canadian Geotechnical Journal 57, no. 10 (October 2020): 1611–16. http://dx.doi.org/10.1139/cgj-2019-0230.

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During large earthquake events where bending moments within soil cements are induced, the tensile strength of cemented soil may govern the deformational behavior of improved ground. Several studies have been conducted to assess the tensile strength of artificially cemented sands that use Portland cement or gypsum; however, the tensile strength of microbially induced carbonate precipitation (MICP)-treated sands with various particle sizes measured through direct tension tests has not been evaluated. MICP is a biomediated improvement technique that binds soil particles through carbonate precipitation. In this study, the tensile strength of nine specimens were measured by conducting direct tension tests. Three types of sand (coarse, medium, and fine) were cemented to reach a heavy level of cementation (e.g., shear wave velocity of ∼900 m/s or higher). The results show that the tensile strength varies between 210 and 710 kPa depending on sand type and mass of carbonate. Unconfined compressive strength (UCS) tests were performed for each sand type to assess the ratio between tensile strength and UCS in MICP-treated sands. Scanning electron microscopy (SEM) images and surface energy measurements were used to determine the predominant failure mode at particle contacts under tensile loading condition.

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Dissertations / Theses on the topic "Tensile tests"

Bonthron, Björn, and Christian Jonsson. "Geogrids in cold climate : Temperature controlled tensile tests & Half-scale installation tests at different temperatures." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-63204.

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Due to the findings of extensive damage on geogrids used in a road embankment in northern Sweden, the Swedish Transport Administration (TRV) started to investigate the reason of these damages. Since the geogrids were installed at low temperature, below 0°C, it was suspected that the damages were connected the low temperature. To analyse whether low temperatures have an influence on the extent of installation damages, both a half-scale setup and temperature controlled tensile tests have been carried out on geogrids. In total five different types of geogrids have been tested; 3 extruded polypropylene geogrids, 1 woven PET geogrid, and 1 welded PET geogrid. All geogrids had an aperture size of approximately 35 mm and specified tensile strength of approximately 40 kN/m. The Half-scale tests was conducted by building a small road embankment inside a freeze container, at the Luleå University of Technology (LTU). The embankment contained crushed aggregate, type 0-70 mm, and geogrids. The purpose of the half-scale test was to simulate installation of geogrids at different temperatures and thereby investigate whether low temperatures have an influence on the rate of installation damages. The half-scale test was done for each type of geogrid at the temperatures: +20°C, -20°C and -30°C. First, the geogrid was covered by 150 mm of crushed aggregate. Then a vibratory plate (160 kg) was used to compact the crushed aggregate. After each installation, the crushed aggregate was removed carefully by vacuum suction. The geogrid was removed and then analysed by visual control and tensile tests conducted according to ISO 10319:2008 (wide width tensile test). Results from the half-scale tests indicate that 2 out of 5 of the tested geogrids were affected by the testing procedure. The results indicate that: - one of the geogrids of polyprophylene (here referred to as G2) was more damaged at lower temperatures compared to installation at +20° C. - the geogrid of woven PET (here referred to as G5) was less damaged at lower temperatures compared to installation at +20° C. Results for the other geogrids are either inconsistent or shows no significant variation of the measured parameters as function of temperature. Hence, these results cannot be interpreted as damage during installation. Temperature controlled tensile tests were done by tensile testing single strands from the geogrids to failure, inside a temperature controlled chamber. The purpose of these tests was to investigate how the strength properties of the geogrids are affected by low temperature. The test was repeated 5 times for each geogrid and temperature (+20°C, 0°C, -10°C and -20°C). Force and strain was measured during the tests. The results from the temperature controlled tensile tests show that the maximum strain decreases with lower temperature for all tested geogrids. The maximum strain decreased by 16% - 49% when the temperature dropped from +20°C to -20°C. The results show that the tensile strength increases with lower temperature for all tested geogrids except for the welded PET geogrid (here referred to as G1). For G1 the tensile strength decreased by approximately 7% at a temperature drop from +20°C to -20°C. For the woven PET geogrid (G5) and the polypropylene geogrids (G2-G3) the tensile strength increased between 13%-45% at a temperature drop from +20°C to -20°C. The E-modulus increased at lower temperature for all tested geogrids. The secant E-modulus at 2% strain increased by 13%-71% at a temperature drop from +20°C to -20°C. Summarized conclusions from the tests: Strength properties changed for all tested geogrids as the temperature decreased. All tested geogrids got stiffer at lower temperatures. The magnitude of the effects is different for different geogrids. The tensile strength increased with lower temperature for all tested geogrids except for the welded PET geogrid, which got lower tensile strength at lower temperature. The half-scale test indicates that the amount of installation damages at geogrids can be dependent of the temperature at installation. However, these indications can only be seen at two out of five tested geogrids. The effect cannot be connected to a specific step in the installation procedure and cannot be explained by the results from the temperature controlled tensile tests. The results from the half-scale test have a statistically low reliability since only one installation for each temperature and geogrid type was done. The compaction equipment used during the test was small, and had low compaction energy compared to a vibratory roller compactor commonly used in construction work. With respect to the discussion above, further studies should be focusing on developing the half-scale test. It is suggested that the test is scaled up to a full-scale test in order to simulate a real installation as close as possible. The test should also be conducted several times for each geogrid at each temperature in order to enable statistical analyses.

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Vorakunpinij, Adisak. "The effect of paper structure on the deviation between tensile and compressive responses." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/7058.

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López, Martínez Juan Ángel. "CHARACTERISATION OF THE TENSILE BEHAVIOUR OF UHPFRC BY MEANS OF FOUR-POINT BENDING TESTS." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/79740.

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Combining the most recent technologies in concrete, Ultra-High-Performance Fibre-Reinforced Concrete (UHPFRC) arises as a promising material for the near future. UHPFRC have shown how flexible concrete can be to adapt to the ever-changing social and environmental demands. With its high flexibility composition and its mechanical properties, UHPFRC is full of both unexplored and unexploited possibilities. Engineers should take responsibility for this task. However, it is fair to acknowledge that this is not an easy task and it requires the development of reliable and widely accepted design standards provided by the scientific community. A major concern about durability, long-lasting structures and reduction of maintenance cost, as well as the development of new concrete technologies, improved knowledge of fibre effect and a huge growth in the fibre industry accompanied by fibre price reduction have led, among other factors, to the development of new types of concrete whose mechanical behaviour substantially differs from conventional fibre-reinforced concrete. This is why current characterisation methodologies and design standards must be reviewed and adjusted to these newer materials. However, design standard revision cannot disregard former milestones achieved thanks to decades of hard work. It must offer an integrated view in which new types of concrete comprise existing ones in a broader group, because at the end of the day and despite having newer and improved properties, new types of concrete are still concrete. That is how it should be understood and how it must be reflected in newer codes and standards. The work presented herein is focused on one of these recently developed materials that embraces major advanced technologies in concrete: Ultra-High-Performance Fibre-Reinforced Concrete (UHPFRC). This work is specifically focused on those crucial requirements for the development and widespread use of it, such as constitutive tensile characterisation and classification. This work includes a deep revision of the uniaxial tensile behaviour of concrete and its development as fibre technology has evolved. In addition, traditional characterisation standard methods as well as those recently developed for its specific use on UHPFRC are reviewed and called into question. Throughout the document, the development of different methodologies to determine the uniaxial constitutive tensile behaviour of UHPFRC from bending tests are shown, together with a simplified characterisation proposal specially developed for being included in a standard. All developed methodologies presented herein are checked and validated. These methods are specifically designed for their application on experimental results obtained from a special type of four-point bending test, whose standardisation proposal for UHPFRC is also shown. Finally, a classification proposal is presented as a function of more relevant UHPFRC tensile parameters necessary for design that can be directly obtained from the standard characterisation test method suggested. Proposed classification encompasses the existing classification for conventional reinforced and fibre-reinforced concrete. In it, both plain concrete and fibre-reinforced concrete are presented as a particular case of a more general tensile constitutive response for concrete. Standard methodology and classification proposed are in accordance with the evolution of concrete and unify historic milestones achieved by the international research community.
El Hormigón de Muy Alto Rendimiento (HMAR) combina los últimos avances tecnológicos en hormigón y se erige como un material prometedor para el futuro. El HMAR ha demostrado su gran capacidad para adaptarse a las cada vez más exigentes demandas sociales y medioambientales. Con un gran abanico de posibilidades en su dosificación para conseguir las propiedades mecánicas deseadas, el HMAR es un material lleno de posibilidades aún sin explorar y sin explotar. Los ingenieros tienen la responsabilidad de esta tarea. Sin embargo, es justo reconocer que no se trata de una tarea fácil y que requiere de un desarrollo previo de códigos de diseño adecuados y ampliamente aceptados por parte de la comunidad científica. La aparición de nuevas tecnologías, el mayor conocimiento sobre la aportación de las fibras así como su industrialización y bajada de precios, las mayores preocupaciones sobre la durabilidad estructural, incremento de la vida útil o la reducción de los costes de mantenimiento, entre otros factores, han derivado en el desarrollo de nuevas tipologías de hormigones cuyo comportamiento mecánico difiere de manera sustancial de los tradicionales hormigones con fibras. Es por ello que tanto la readaptación de las metodologías de caracterización como las metodologías de diseño deben ser reformuladas. Y esto debe hacerse de manera no disruptiva, es decir, manteniendo la línea de los hitos alcanzados en los hormigones con fibras convencionales de manera que queden integrados en metodologías de caracterización y de diseño que los engloben, porque al fin y al cabo, y aunque con nuevas y mejores propiedades mecánicas, los nuevos hormigones siguen siendo hormigones. Así debe ser entendido y así debe quedar reflejado en las nuevas normativas. El presente trabajo se centra en uno de esos nuevos materiales desarrollados con el avance de las nuevas tecnologías como es el HMAR. En especial, este documento se centra en ese aspecto tan fundamental para el desarrollo de nuevos hormigones como es la caracterización mecánica y la tipificación. Este trabajo incluye una revisión del comportamiento mecánico uniaxial a tracción del hormigón y de su evolución con la aparición de las diferentes tecnologías. Además, se revisan y se ponen en cuestión los sistemas tradicionales de caracterización, así como los nuevos sistemas desarrollados en los últimos años para su empleo específico en el HMAR. A lo largo del documento se desarrollan diferentes metodologías para la obtención del comportamiento constitutivo a tracción del HMAR, así como la propuesta de una metdología simplificada de caracterización especialmente diseñada para ser incluida en una norma, todas ellas debidamente validadas. Estas metodologías son de aplicación específica a los resultados experimentales obtenidos mediante un ensayo a cuatro puntos sin entalla, cuya propuesta de estandarización para el HMAR ha sido también desarrollada. Finalmente, se presenta una propuesta de tipificación de acuerdo a los parámetros más relevantes del comportamiento a tracción del HMAR que son necesarios para el diseño y que pueden ser directamente obtenidos del ensayo de caracterización propuesto. Esta clasificación engloba a la clasificación existente para el hormigón armado convencional y los actuales hormigones con fibras, de manera que se presenta la actual definición de hormigón con fibras como un caso particular de estos nuevos hormigones, respetando al máximo la evolución de este material y aunando los logros conseguidos por la comunidad científica.
Dins de les combinacions de les tecnologies més recents en el formigó, el formigó de molt alt rendiment (UHPFRC) sorgeix com un material prometedor per al futur pròxim. L'UHPFRC ha demostrat poder ser un formigó flexible per adaptar-se a les sempre canviants demandes socials i mediambientals. Amb una gran flexibilitat en la seua composició i les seues propietats mecàniques, l`UHPFRC està ple de possibilitats de ser explorades i explotades. Els enginyers han de prendre la responsabilitat d'aquesta tasca. No obstant això, és just reconèixer que això no serà fàcil i requerirà el desenvolupament de normes de disseny fiables i àmpliament acceptades per la comunitat científica. Hi ha una gran preocupació al voltant de la durabilitat, la vida útil de les estructures i la reducció del cost de manteniment, juntament amb el desenvolupament de noves tecnologies de formigó, un millor coneixement de l'efecte de la fibra i un enorme creixement en la indústria de la fibra acompanyat per la reducció del preu de la fibra, han conduït, entre altres factors, al desenvolupament de nous tipus de formigons, el comportament mecànic dels quals es diferencia substancialment dels formigons reforçats amb fibres convencionals. És per això que les metodologies de caracterització actuals i les normes de disseny han de ser revisades i ajustades a aquests nous materials. No obstant això, la revisió del codis de disseny no pot prescindir de les antigues fites aconseguides gràcies a dècades de treball dur. S'ha d'oferir una visió integrada en la qual els nous tipus de formigons integren els ja existents en un grup més ampli, ja que, al cap i la fi i malgrat tenir propietats noves i millorades, els nous tipus de formigons són encara un tipus de formigó. Així es com s'hauria d'entendre i reflectir-se en els nous codis i normes. El treball presentat en aquest document es centra en un d'aquests materials que s'han desenvolupat recentment i que abasta les principals tecnologies avançades en el formigó: el Formigó de Molt Alt Rendiment Reforçat amb Fibres (UHPFRC). Aquest treball se centra específicament en els requisits fonamentals per al desenvolupament i l'ús generalitzat d'aquest, com ara la caracterització i classificació del comportament constitutiu a tracció. Aquest treball inclou una revisió profunda del comportament a tracció uniaxial del formigó i els seus canvis al temps que la tecnologia de les fibres ha evolucionat. A més, els mètodes tradicionals estàndard de caracterització, així com els recentment desenvolupats per al seu ús específic en l'UHPFRC són revisats i qüestionats. Al llarg del document, es mostra el desenvolupament de diferents metodologies per a determinar el comportament constitutiu a tracció uniaxial de l'UHPFRC, juntament amb una proposta de caracterització simplificada especialment desenvolupada per poder ser inclosa en normativa. Totes les metodologies desenvolupades presentades en aquest document han estat comprovades i validades. Aquests mètodes estan dissenyats específicament per a la seva aplicació en els resultats experimentals obtinguts a partir d'un tipus especial d'assaig de flexió a quatre punts, a més també s'inclou una proposta d'estandardització per a l'UHPFRC. Finalment, es presenta una proposta de classificació en funció dels paràmetres més rellevants del comportament a tracció de l'UHPFRC que són necessaris per al disseny i que es poden obtindre directament del mètode d'assaig estàndard suggerit per a la caracterització de l'UHPFRC. La classificació proposada té amb compte la classificació existent per al formigó armat convencional i el reforçat amb fibres. En ella, tant el formigó en massa com el formigó reforçat amb fibres es presenten com un cas particular d'una resposta constitutiva a tracció més general per al formigó. La metodologia estàndard i la classificació proposada estan d'acord amb l'evolució de formigó i unifica l
López Martínez, JÁ. (2017). CHARACTERISATION OF THE TENSILE BEHAVIOUR OF UHPFRC BY MEANS OF FOUR-POINT BENDING TESTS [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/79740
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Clayton, Russell Adrian. "Investigation of stabilized Berea Red soil with emphasis on tensile and cyclic triaxial tests." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/8319.

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Includes bibliographical references.
This dissertation investigates the soil mechanical properties of a sample of Berea Red soil and the most suitable methods of treatment to improve it. Special attention has been paid to lime stabilization and different curing techniques. Gradings, special indicators and California Bearing Ratios were determined on both natural and lime stabilized Berea Red soil. Consolidometer tests were performed on natural and lime or cement stabilized soil at various densities to establish the compressibility and collapse potential. A computer controlled Indirect Tensile Testing with data logging facilities was developed in apparatus order that some of the soil mechanical properties of Berea Red soil may be determined. Natural and stabilized Berea Red soil was tested in a monotonic and cyclic triaxial apparatus to determine the short and long stress strain characteristics.

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Brown, David Roger. "An assessment of the compaction behaviour of pharmaceutical compacts by means of complementary mechanical tests." Thesis, University College London (University of London), 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336444.

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Eriksen, Lars. "Combined EBSD-Investigations and In-situ Tensile Tests of a Direct Metal Deposited Ti6Al4V-Alloy." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22438.

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Two blocks made of Ti6Al4V material produced by Norsk Titanium Components ned Direct Metal Deposition (DMD) production technology were delivered for this investigation. The main difference between the blocks was the different waiting time implemented in the production parameters. The different waiting time implied that the material were allowed to cool to a deisred Interpass Temperature (IT). The blocks are referred to as T200 and T600 after their lowest IT of <200 degrees celsius and 500-700 degrees celsius, respectively. Sintef Manufacturing Raufoss reported elongations of 5% and 8% in the deposition-direction of the two blocks, which was lower than the 10% elongation obtained for the building-direction. The objective was to find any explanations for the impaired ductility in the deposition-direction, and why T200 have a lower elongation than T600. To reveal differences in micro- macrostructure and deformation-mechanisms between the blocks was combined EBSD+In-situ. tensile tests the main tool. Complementary studies with optical microscopy of etched in-situ specimens were also performed.The work started with an extensive macroetching of different planes relative to the deposition-direction. This revealed a 3D-image of the epitaxially growing solidification structure of columnar prior beta grains. Measurements of grain size and morphology did not indicate significant differences between the blocks. Later was EBSD selected to prior beta grain boundaries for specimens at the center of the blocks. Measurements of the thickness of primary alfa phase also indicated small differences between the blocks. From this it was concluded that the different ITs lead to small differences in solidification structure and the amount of primary alfa phase in the center of the blocks.The EBSD + in-situ tensile tests were carried out for specimens fabricated from the blocks in the deposition direction, such that investigation could be performed in the XZ-plane. The force was applied parallel to the deposition direction X. The in-situ specimens in block T200 had a slightly higher position in the block giving a finer microstructure because of faster cooling rates. The T200 specimens also contained to deposition layers in contrast to only one in T600 specimens. This made a direct comparison difficult. However, from the four in-situ specimens investigated was the following concluded: specimens from T200 deformed more homogeneously on a macroscale. Correspondingly was more activity observed at prior beta grain boundaries for T600. The more active grain boundaries in T600 may result from the different cooling rates from the peak temperature. Slower cooling rates will give smaller prior beta grains decorated with more homogeneous alfa phase along the boundaries of T600 specimens. The frequently reported detrimental mismatch between soft and hard HCP-grains in titanium alloys were also observed. However, the orientation and morphology of these grains seems to play an important role. Cracks growing along prior beta grains were always located at the side having a non-Burgers orientation relationship. The lamellar basketweave microstructure also seem quite effective to stop cracks from growing further, because of the plates having distinct orientations.This work has also uncovered the transition in microstructure between the substrate plate and first deposition layer. The microstructure develops from a very fine bimodal plate structure, through a equiaxed region with small amounts of primary alfa phase, to early stages of the columnar beta grain configuration. The first columnar beta grains are very small in size compared to higher up in the block, and they contains very small amounts of primary alfa phase. However, the basketweave microstructure develops relatively close to the substrate plate.

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García, Cabrera Miguel. "Structural Material Investigation of Horse Hoof." Thesis, Högskolan i Skövde, Institutionen för teknik och samhälle, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-8309.

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This research focuses on a study of the material parameters of horse hoof. The study of the problem with the factors that affect to the fastening of the shoe is not performed. Three different tests are carried out to obtain the behavior of the horn wall of the horse hoof in different ways, under physiological conditions and variation of hydration level. The first one is a tensile test to obtain both the force/displacement relation and the stress/strain relation and the parameters derived from them. The second is a hardness test to determine how the material resists to several kinds of permanent-shape changes when a force is applied.Finally, a microscopic study is performed to analyze the fracture surface after testing the specimens. A meticulous analysis of the results and a broad comparison with several researches are performed. The end of the thesis work suggests future works needed to solve the problem.

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Zhang, Juan. "A novel fuzzy digital image correlation algorithm for non-contact measurement of the strain during tensile tests." Thèse, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/8205.

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Cette thèse a pour objet la mesure de déformations sans contact lors d'un essai de traction à l'aide de la méthode de corrélation d'images numériques DIC (Digital Image Correlation). Cette technologie utilise le repérage d'un motif aléatoire de tachetures pour mesurer avec précision les déplacements sur une surface donnée d'un objet subissant une déformation. Plus précisément, un algorithme DIC plus efficace a été formulé, appliqué et validé. La présente thèse comporte cinq parties consacrées au développement et à la validation du nouvel algorithme DIC: (a) la formulation mathématique et la programmation, (b) la vérification numérique, (c) la validation expérimentale, par essai de traction, en comparant les mesures DIC à celles obtenues par des jauges de déformation, (d) l'étude d'un procédé d'atomisation novateur pour générer de façon reproductible le motif de tachetures pour un repérage plus exact, et (e) l'analyse des sources d'erreur dans les mesures DIC. Plus précisément, l'algorithme DIC a servi à analyser, à titre d'exemple d'application, les propriétés mécaniques du polyméthyl métacrylate utilisé pour la reconstruction du squelette. Avec l'algorithme DIC, les images d'un objet sont acquises pendant la déformation de celui-ci. On applique ensuite des techniques d'optimisation non linéaire pour suivre le motif de tachetures à la surface des objets subissant une déformation en traction avant et après le déplacement. Ce procédé d'optimisation demande un choix de valeurs de déplacement initiales. Plus l'estimation de ces valeurs de déplacement initiales est juste, plus il y a de chances que la convergence du processus d'optimisation soit efficace. Ainsi, cette thèse présente une technique de traitement novatrice reposant sur une logique floue incluant aussi l'approximation des valeurs initiales du déplacement pour démarrer un processus itératif d'optimisation, ayant pour résultat une reproduction plus exacte et efficace des déplacements et des déformations. La formulation mathématique du nouvel algorithme a été développée et ensuite mise en œuvre avec succès dans le langage de programmation MATLAB. La vérification de l'algorithme a été faite à l'aide d'images de synthèse simulant des déplacements de corps rigides et des déformations de traction uniformes. Plus particulièrement, les images de déplacement simulaient (1) des déplacements de 0, 1 - 1 pixel en translation, (2) des angles de rotation de 0, 5 - 5°, et (3) de grandes déformations en traction de l'ordre de 5000 à 300000µE déformation, respectivement. Les processus de vérification ont démontré que le taux d'exactitude du nouvel algorithme DIC est supérieur à 99% en ce qui concerne les mesures des différents types et niveaux de déplacements simulés. Une validation expérimentale a été menée afin d'examiner l'efficacité de la nouvelle technique dans des conditions réalistes. Des échantillons de PMMA normalisés, respectant la norme ASTM F3087, ont été produits, inspectés et soumis à une charge de traction jusqu'à la rupture. La déformation de la surface des échantillons a été mesurée au moyen (a) du nouvel algorithme DIC, et (b) des techniques utilisant des jauges de déformation de type rosette. La force maximale moyenne et la limite de résistance mécanique des quatre échantillons étaient de 880 ± 110 N et 49 ± 7 MPa, respectivement. La limite moyenne de déformation mesurée par la jauge de déformation et provenant de l'algorithme DIC étaient de 15750±2570 et 19890±3790 µs déformation, respectivement. Des déformations d'un tel ordre sont courantes pour les matériaux polymériques, et jusqu'à maintenant, la technique DIC n'n’était pas développée pour faire des mesures de déformations aussi importantes. On a constaté que l'erreur relative de la mesure DIC, par rapport à la technique de la jauge de déformation, s'élevait à 26 ± 8%. Par ailleurs, le module de Young moyen et le coefficient de Poisson moyen mesurés en utilisant des jauges de déformations étaient de 3, 78 ± 0, 07 G Pa et 0, 37 ± 0, 02, alors qu'ils étaient de 3, 16 ± 0, 61 GPa et 0, 37 ± 0, 08, respectivement lorsque mesurés avec l'algorithme DIC. L'écart croissant entre les mesures de déformation DIC et celles obtenues au moyen de jauges de déformation est probablement lié à la distorsion graduelle du motif de tachetures à la surface des échantillons de traction. Par la suite, on a introduit un facteur de correction de 1, 27 afin de corriger l'erreur systématique dans les mesures de déformation provenant de l'algorithme DIC. La limite de déformation des mesures DIC a été rajustée à 15712±357 µs déformation avec un taux d'erreur moyen relatif de -0, 5 ± 7, 1 %, comparé aux déformations mesurées par la jauge de déformation. Le module de Young moyen et le coefficient moyen de Poisson de l'algorithme DIC et des mesures obtenues par la jauge de déformation ont par ailleurs été rajustés à 3, 8 ± 0, 4 GPa et 0, 368 ± 0, 025, respectivement. Au moyen d'un procédé d'atomisation, des taches de peinture ont été générées de façon reproductible sur la surface d'un objet. Une approche expérimentale de planification factorielle a été utilisée pour étudier le motif de tachetures (répartition et gradient de l'échelle des tons de gris) pour mesurer l'exactitude de l'algorithme DIC. Plus particulièrement, neuf motifs de tachetures différents ont été générés au moyen du procédé d'atomisation et testés pour la translation et la rotation de corps rigides. Les résultats ont révélé que l'erreur moyenne relative parmi les neuf motifs de tachetures variait de 1, 1 ± 0, 3% à -6, 5 ± 3, 6%. Le motif de tachetures préféré, lequel se démarquait par une large gamme de taches claires et de valeurs de tons de gris, a produit une erreur relative de 1, 1 ± 0, 3%. Une analyse des erreurs et des sources d'erreurs relatives de la mesure de l'algorithme DIC a été menée. Ti-ois catégories de sources d'erreurs, incluant l'algorithme lui-même, les paramètres du processus (taille des sous-ensembles, nombre de pixels calculés) et l'environnement physique (uniformité des échantillons, motifs de tachetures, effet thermique de la caméra CCD et distorsion de la lentille, erreur de non-linéarité dans le circuit de la jauge de déformation) ont fait l'objet d'une étude et de discussions. Enfin, des solutions ont été amenées afin d'aider à réduire les erreurs systématiques et aléatoires en lien avec les trois catégories de sources d'erreurs susmentionnées. Pour terminer, un nouvel algorithme DIC permettant une approximation plus juste de l'estimation initiale, entraînant par conséquent une convergence efficace et précise de l'optimisation a été développé, programmé, mis en oeuvre et vérifié avec succès pour ce qui est des déformations importantes. La validation expérimentale a fait ressortir une erreur systématique inattendue des mesures DIC lorsque comparées aux mesures obtenues au moyen de la technique des jauges de déformation. Plus l'échantillon se déformait, plus l'erreur augmentait proportionnellement. Par conséquent, la distorsion graduelle des tachetures sur la surface de l'objet était probablement la cause de l'erreur. L'erreur étant systématique, elle a été corrigée. Le procédé d'atomisation a permis de générer des tachetures de façon reproductible sur la surface d'un objet. Grâce aux mesures DIC, le comportement mécanique des polymères soumis à des déformations importantes, comme le polyméthyl métacrylate servant à la reconstruction du squelette, peut être étudié et une fois maîtrisé, servir à l'élaboration de matériaux plus efficaces.
Abstract : The present thesis is focused on the non-contact and efficient strain measurement using the Digital Image Correlation (DIC) method, which employs the tracking of random speckle pattern for accurate measurement of displacements on a surface of an object undergoing deformation. Specifically, a more efficient DIC algorithm was successfully developed, implemented, and validated. This thesis consists of five parts related to the novel DIC algorithm: (a) the development and implementation, (b) the numerical verification, (c) the experimental validation, for tensile loading, by comparing to the deformation measurements using the strain gauge technique, (d) the investigation of a novel atomization process to reproducibly generate the speckle pattern for accurate tracking, and (e) the analysis of the error sources in the DIC measurements. Specifically, the DIC algorithm was used to exemplarily examine the mechanical properties of polymethyl methacrylate (PMMA) used in skeletal reconstruction. In the DIC algorithm, images of an object are captured as it deforms. Nonlinear optimization techniques are then used to correlate the speckle on the surface of the objects before and after the displacement. This optimization process includes a choice of suitable initial displacement values. The more accurate the estimation of these initial displacement values are, the more likely and the more efficient the convergence of the optimization process is. The thesis introduced a novel, fuzzy logics based processing technique, approximation of the initial values of the displacement for initializing iterative optimization, which more accurately and efficiently renders the displacements and deformations as results. The mathematical formulation of the novel algorithm was developed and then successfully implemented into MATLAB programming language. The algorithmic verification was performed using computer-generated images simulating rigid body displacements and uniform tensile deformations. Specifically, the rigid motion images simulated (1) displacements of 0.1-1 pixel for the rigid body translation, (2) rotation angles of 0.5-5 ̊ for rigid body rotation and (3) large tensile deformations of 5000-300000µɛ, respectively. The verification processes showed that the accuracy of the novel DIC algorithm, for the simulated displacement types and levels above 99%. The experimental validation was conducted to examine the effectiveness of the novel technique under realistic testing conditions. Normalized PMMA specimens, in accordance to ASTM F3087, were produced, inspected and subjected to tensile loading until failure. The deformation of the specimen surface was measured using (a) the novel DIC, and (b) strain gauge rosette techniques. The mean maximum force and ultimate strength of four specimens were 882.2±108.3 N and 49.3±6.2 MPa, respectively. The mean ultimate deformation from the gauge and DIC groups were 15746±2567µɛ and 19887±3790µɛ, respectively. These large deformations are common in polymeric materials, and the DIC technique has thus far not been investigated for large deformation. The relative mean error of the DIC measurement, in reference to those of the strain gauge technique, was found to be up to 26.0±7.1%. Accordingly, the mean Young's modulus and Poisson's ratio of strain gauge measurement were 3.78±0.07 GPa and 0.374±0.02, and of the DIC measurements were 3.16±0.61 GPa and 0.373±0.08, respectively. The increasing difference of the DIC strain measurements relative to those of the strain gauge technique is likely related to the gradual distortion of the speckle pattern on the surface of the tensile specimen. Subsequently, a Correction Factor (CF) of 1.27 was introduced to correct for the systematic error in the deformation measurements of the DIC group. The corrected ultimate deformation of the DIC measurements became 15712±357µɛ with the relative mean error of -0.5±7.1%, if compared to those measurements of the strain gauge techniques. Correspondingly, the mean Young's Modulus and Poisson's ratio of the DIC and of the strain gauge measurements became 3.8±0.4 GPa and 0.368±0.025, respectively. Using an atomization process, paint speckles were reproducibly generated on the surface of an object. A factorial design of experiments was used to investigate the speckle pattern (grey value distribution and gradient) for the DIC measurement accuracy. Specifically, nine different speckle patterns were generated using the atomization process and tested for rigid body translation and rotation. The results showed the relative mean errors among the nine speckle patterns varied from 1.1±0.3% to -6.5±3.6%. The preferred speckle pattern, which was characterized by a wide range of sharp speckle and of grey values, produced a mean error of 1.1±0.3%. The analysis of errors and relating sources in the DIC measurement was conducted. Three categories of sources including algorithmic sources, processing parameters sources (subset size, number of pixels computed) and physical environment sources (specimen uniformity, speckle pattern, self-heating effect of the CCD camera and lens distortion of the camera, non-linearity error in strain gauge circuit) were investigated and discussed. Finally, the solutions were provided in order to help reduce the systematic and random errors relating to the aforementioned three categories of sources for errors. In conclusion, a novel DIC algorithm for a more accurate approximation of the initial guess and accordingly for an efficient and accurate convergence of the optimization was successfully formulated, developed, implemented and verified for relatively large deformations. The experimental validation surprisingly showed a systematic error of the DIC measurements, if compared to the measurements of the strain gauge technique. The larger the deformation applied to the specimen, the larger the error gradually became. Therefore, the gradual distortion of the speckles on the surface of the object was likely the underlying cause of the error. The error was systematic and therefore corrected. The atomization process allowed generating reproducible speckles on the surface of an object. Using the DIC measurements, the mechanical behavior of polymers, undergoing large deformations, such as polymethyl methacrylate used in skeletal reconstruction can be investigated and, once understood, the knowledge gained can help develop more effective materials.

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Bathini, Udaykar. "A Study of Microstructure, Tensile Deformation, Cyclic Fatigue and Final Fracture Behavior of Commercially Pure Titanium and a Titanium Alloy." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1281973687.

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Forde, Kohler Lois J. "The effects of ophiostoma piliferm on wood pulp : investigation." Thesis, Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/5982.

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Books on the topic "Tensile tests"

Center, Langley Research, ed. Manual for LDEF tensile tests. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1985.

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1935-, Adams Donald Frederick, and United States. National Aeronautics and Space Administration., eds. Static tensile and tensile creep testing of five ceramic fibers at elevated temperatures. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1989.

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F, Adams Donald, Zimmerman Richard S, and Ames Research Center, eds. Static tensile and tensile creep testing of four boron nitride coated ceramic fibers at elevated temperatures: Final report. Moffett Field, Calif: NASA Ames Research Center, 1989.

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United States. National Aeronautics and Space Administration., ed. Rhenium material properties. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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Center, Langley Research, ed. Baseline tensile tests of composite materials for LDEF exposure. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1987.

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Poon, C. Tensile fracture of notched composite laminates. Ottawa, Ont: National Research Council Canada, 1991.

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Ossa, William. Material characterization of superplastically formed titanium (Ti-6Al-2Sn-4Zr-2Mo) sheet. Hampton, Va: Langley Research Center, 1987.

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Moore, Thomas J. Tensile strength of simulated and welded butt joints in W-Cu-composite sheet. Cleveland, Ohio: Lewis Research Center, 1994.

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C, Goldsby Jon, DiCarlo James A, and United States. National Aeronautics and Space Administration., eds. Tensile creep and stress-rupture behavior of polymer derived SiC fibers. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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Book chapters on the topic "Tensile tests"

Gooch, Jan W. "Tensile Property Tests." In Encyclopedic Dictionary of Polymers, 733. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11629.

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John, Vernon. "Tensile, Compressive and Shear Tests." In Testing of Materials, 21–48. London: Macmillan Education UK, 1992. http://dx.doi.org/10.1007/978-1-349-21969-8_3.

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Weber, André, Christian Caspari, and Matthias Pahn. "Tensile Tests at GFRP Rebars." In Lecture Notes in Civil Engineering, 918–27. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-88166-5_80.

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Sakino, Yoshihiro, Toshio Kuroda, and You-Chul Kim. "Tensile Behavior of Zr-Based Bulk Metallic Glass in High-Speed Tensile Tests." In Ceramic Transactions Series, 43–47. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470917145.ch7.

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Invernizzi, Stefano, Oscar Borla, Giuseppe Lacidogna, and Alberto Carpinteri. "Piezonuclear Evidences from Tensile and Compression Tests on Steel." In Acoustic, Electromagnetic, Neutron Emissions from Fracture and Earthquakes, 83–97. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16955-2_7.

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Look, Katharina, Peter Heek, and Peter Mark. "Direct Tensile Tests of Supercritical Steel Fibre Reinforced Concrete." In RILEM Bookseries, 132–42. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-83719-8_12.

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Zhang, Wenbo, Rong Sui, Ruling Lin, Cunbian Li, Huidan Zhang, Zhen Wang, and Mingyan Bai. "Analysis of Tensile Tests on High-Performance Fiber Fabrics." In Lecture Notes in Electrical Engineering, 393–99. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-7139-4_54.

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Yu, Haian, Lei Zhang, Shuai Su, and Kun Huang. "Experimental and Numerical Studies on Shear and Tensile Behavior of Horizontal Connecting Joints for Improved Precast Concrete Bearing Wall Structure." In Novel Technology and Whole-Process Management in Prefabricated Building, 208–30. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-5108-2_23.

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AbstractAn improved precast bearing wall structure was proposed, with light weight gauge steel members embedded in the wall, forming full length hole for dowels passing through, which can provide higher speed and lower cost construction method, especially for low rise buildings. The shear and tensile behavior of the horizontal joints for the novel precast bearing wall structure were studied through experimental and numerical investigation in this paper. Three identical specimens for horizontal joints shear and tensile tests separately were tested. The shear test specimens were designed from the wall-slab-wall connection part while the tensile test specimens were designed from the wall-foundation connection part. The whole experimental process from crack generation to joints failure was investigated in detail and the load-displacement curves were provided and analysed. Based on experimental results, the finite element models of both type specimens are verified and calibrated using ABAQUS. The shear and tensile failure mechanism of horizontal joints is presented and the recommendations to increasing the horizontal joints strength capacity and ductile performance are proposed, which may provide practical guidance for future engineering practice.

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Rincent, Jean-Jacques Henri. "The Fatigue Phenomenon." In Ground Anchors, 77–80. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-4414-5_13.

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AbstractDuring testing, we noted the influence of cyclic loads on tie-rod load losses. In a number of tests, we measured the deformations induced in the tie rods by the loads of railway trains. During direct tensile tests, we observed strand failures in tie rods subjected to these loads.

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Reed, R. P., and R. L. Durcholz. "Cryostat and Strain Measurement for Tensile Tests to 1.5°K." In Advances in Cryogenic Engineering, 109–16. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4757-0513-3_16.

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Conference papers on the topic "Tensile tests"

Chevallier, Anouk, Ali Zarei, Olli Tanhuanpää, Markus Kakkonen, Lassi Sukki, Florian Boutenel, Violaine Guicheret, Vincent Placet, Pasi Kallio, and Cédric Clévy. "Assessment of Direct Microrobotic Gripping for Single Flax Fibre Tensile Tests." In 2024 International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS), 1–6. IEEE, 2024. http://dx.doi.org/10.1109/marss61851.2024.10612737.

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Hill, Susan I. "Dynamic Tensile Tests on Foams." In SAE 2001 World Congress. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2001. http://dx.doi.org/10.4271/2001-01-0471.

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Modlinski, Robert, Robert Puers, and Ingrid De Wolf. "Micro-tensile tests to characterize MEMS." In 2007 IEEE 20th International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2007. http://dx.doi.org/10.1109/memsys.2007.4433103.

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Bilici, Temel, Nermin Topaloglu, Ozgur Tabakoglu, Hamit Kalaycioglu, Adnan Kurt, Alphan Sennaroglu, and Murat Gulsoy. "Welding by Thulium laser system: Tensile strength tests." In 2010 15th National Biomedical Engineering Meeting (BIYOMUT 2010). IEEE, 2010. http://dx.doi.org/10.1109/biyomut.2010.5479809.

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Cuando-Espitia, Natanael, F. M. Sánchez-Arévalo, and J. Hernández-Cordero. "Enhanced backscattering measurements in bovine pericardium tensile tests." In Latin America Optics and Photonics Conference. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/laop.2014.lth4a.22.

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Grant, Barbara, Giancarlo Pigozzi, Stephan Frank, Ralph Spolenak, P. M. Champion, and L. D. Ziegler. "Tensile Tests on Few-Layer Graphite∕Polymer Composite." In XXII INTERNATIONAL CONFERENCE ON RAMAN SPECTROSCOPY. AIP, 2010. http://dx.doi.org/10.1063/1.3482619.

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Wu, G., N. Dhanaraj, L. Cooley, D. Hicks, E. Hahn, D. Burk, W. Muranyi, et al. "TENSILE TESTS OF NIOBIUM MATERIAL FOR SRF CAVITIES." In TRANSACTIONS OF THE CRYOGENIC ENGINEERING CONFERENCE—CEC: Advances in Cryogenic Engineering. AIP, 2010. http://dx.doi.org/10.1063/1.3422440.

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Anashkin, O. P., V. E. Kilin, A. V. Krivykh, D. N. Diev, A. S. Dinisilov, V. I. Shcherbakov, and V. I. Tronza. "Tensile tests of ITER TF conductors jacket materials." In ADVANCES IN CRYOGENIC ENGINEERING: Transactions of the International Cryogenic Materials Conference - ICMC, Volume 58. AIP, 2012. http://dx.doi.org/10.1063/1.4712087.

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Sun, Wei, Guangqing Zhang, Xiaojia Xue, and Wenbin Chen. "Rock Tensile Properties and Modification of Tensile Strength Criterion Under Confining Pressure." In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0587.

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ABSTRACT To reveal the influence of confining pressure on the tensile properties of rock, Brazilian disc tests for tight sandstone and granite under different confining pressures were carried out. The tensile failure characteristics were analyzed, and the tensile strength-confining pressure curves were obtained. The maximum tensile stress criterion was modified considering the influence of confining pressure, which was incorporated into ABAQUS, and characteristics of hydraulic fractures under different in-situ stress conditions were studied. The results reveal that (1) under the confining pressure of 0-25 MPa, the failure mode of tight sandstone changes from tensile failure to tensile-shear failure, while granite only exhibits tensile failure; (2) under the tensile failure mode, the relationship between tensile strength and confining pressure is linear, and the confining pressure has a more significant influence on granite; (3) the modified maximum tensile stress criterion is expressed as multiple sets of nested vertical planes in the principal stress space; (4) ignoring the influence of confining pressure on tensile strength, the breakdown pressure is underestimated, the fracture length is overestimated, and the maximum fracture width is underestimated. INTRODUCTION The tensile failure of rocks in hydraulic fracturing occurs under the in-situ stress environment, which belongs to confined tensile failure (Chen et al., 2023). Conventional rock tensile tests have gradually expanded to confined rock tensile tests. The confined direct tensile test is an experimental method in which the specimen is directly tensioned under confining pressure. You et al. (2006) conducted direct tensile tests under confining pressure by bonding the cylindrical specimen to the squeeze head. The results showed that the tensile strength decreases with the increase of confining pressure, and the Griffith criterion in the tensile stress region is not valid for rocks. However, the failure surfaces were not in the middle of the test piece, but closer to the end. Liu et al. (2019) compared the results of triaxial tension and triaxial compression tests of cylindrical sandstone specimens. It is considered that confining pressure can improve the compressive strength of sandstone and reduce its tensile strength, and the impact on the former is greater than the latter. Because of the uncertainty of the failure section of the cylindrical specimen, the direct tensile tests of the dog-bone specimen were carried out (Ma et al., 2018; Lan et al., 2019; Tarokh et al., 2022). Compared with the cylindrical specimen, the sections of the dog-bone specimen are primarily located in the middle of the specimen. With the increase of the confining pressure, the specimen section gradually inclines. The failure mode transits from tensile failure to tension-shear failure. The confined hollow cylinder tensile test is an experimental method of obtaining tensile strength by hydraulic fracturing. A significant positive correlation between rock tensile strength and confining pressure (Zhang et al., 2020; Li et al., 2019). Li et al. (2019) indicated that increasing confining pressure can decrease rock brittleness, enhance its toughness, and increase the energy required for microcracks to continue expanding. This results in an increase in macroscopic tensile strength and fracture toughness of rocks. The confined Brazilian disc test is widely used to obtain tensile strength indirectly. Mighani et al. (2015) suggested that confining pressure hinders the nucleation of microfractures, resulting in an increase in tensile strength as the confining pressure increases. Li et al. (2020) obtained the tensile failure envelope through multistage Brazilian disc tests on sandstone. Li et al. (2018) used the copper jacket to wrap Brazilian disc specimens to isolate fluid and rock. The experimental results indicate that the inclination of the failure surface increases with the increase of confining pressure, and the failure mode changes from tensile failure (low confining pressure) to shear failure (high confining pressure). Hagengruber et al. (2021) demonstrated an increase in the intermediate principal stress can significantly enhance the strength of sandstone, and as the confining pressure increases, the characteristics of shear failure gradually become more apparent. Wu et al. (2016) indicated the dynamic tensile strength increased with the increase of the confining pressure. Moreover, under equivalent levels of confining pressure, the dynamic tensile strength of rock increases with the loading rate.

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Igi, Satoshi, Takahiro Sakimoto, Nobuhisa Suzuki, Ryuji Muraoka, and Takekazu Arakawa. "Tensile Strain Capacity of X80 Pipeline Under Tensile Loading With Internal Pressure." In 2010 8th International Pipeline Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ipc2010-31281.

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This paper presents the results of experimental and finite element analysis (FEA) studies focused on the tensile strain capacity of X80 pipelines under large axial loading with high internal pressure. Full-pipe tensile test of girth welded joint was performed using high-strain X80 linepipes. Curved wide plate (CWP) tests were also conducted to verify the strain capacity under a condition of no internal pressure. The influence of internal pressure was clearly observed in the strain capacity. Critical tensile strain is reduced drastically due to the increased crack driving force under high internal pressure. In addition, SENT tests with shallow notch specimens were conducted in order to obtain a tearing resistance curve for the simulated HAZ of X80 material. Crack driving force curves were obtained by a series of FEA, and the critical global strain of pressurized pipes was predicted to verify the strain capacity of X80 welded linepipes with surface defects. Predicted strain showed good agreement with the experimental results.

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Reports on the topic "Tensile tests"

Cunningham, B., and F. Gagliardi. 900-24 Mock Tensile Tests. Office of Scientific and Technical Information (OSTI), December 2007. http://dx.doi.org/10.2172/926389.

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Swinson, W. F., R. L. Battiste, A. L. Wright, G. T. Yahr, and J. P. Robertson. Pressure reversal study through tensile tests. Office of Scientific and Technical Information (OSTI), December 1997. http://dx.doi.org/10.2172/292812.

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Schulthess, Jason. Elevated Temperature Tensile Tests on DU–10Mo Rolled Foils. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1183495.

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Schulthess, Jason. Elevated temperature tensile tests on DU-10Mo rolled foils. Office of Scientific and Technical Information (OSTI), May 2018. http://dx.doi.org/10.2172/1466662.

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Yoosef-Ghodsi and Zimmerman. L51879 Effect of Y-T Ratio on Mechanical Damage Tolerance for Strain-Limit Pipeline Design. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), March 2008. http://dx.doi.org/10.55274/r0011057.

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This work investigates the effect of the yield-to-tensile strength ratio (Y/T) has on the mechanical damage tolerances of steel pipelines subject to high strain loading conditions. The work includes full-scale tests and the development of an analytical model for calculating longitudinal tensile strain capacity. The tests were designed to simulate the type of loading that occurs in a pipeline subjected to a �significant ground movement event, and they involved pressurized tension tests on short, full pipe sections that contained artificially-manufactured, circumferentially-oriented dent-gouge defects. A total of 26 tests were performed on pipe specimens with Y/T values ranging from 0.81 to 0/93 and Charpy toughness ranging from 64 to 115 J.

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Wolf, Lawrence J. Tensile Tests for Quality Control of Injection Molded Composite Posts. Office of Scientific and Technical Information (OSTI), August 1990. http://dx.doi.org/10.2172/1119332.

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Busching, Herbert W., Walter J. Rossiter, and Robert G. Mathey. Suggested approaches for revisions of preliminary performance criteria for tensile and tensile fatigue strength tests of bituminous membrane roofing. Gaithersburg, MD: National Bureau of Standards, 1986. http://dx.doi.org/10.6028/nbs.ir.86-3347.

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Shives, T. Robert, and Samuel R. III Low. Tensile tests of type 305 stainless steel mine sweeping wire rope. Gaithersburg, MD: National Institute of Standards and Technology, 1989. http://dx.doi.org/10.6028/nist.ir.89-4174.

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Schulthess, Jason L. Elevated Temperature Tensile Tests on DU10Mo Rolled Foils TEV-2194 R1. Office of Scientific and Technical Information (OSTI), May 2018. http://dx.doi.org/10.2172/1547069.

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Badcock, C. D., and R. Madhavan. PR-106-521-R02 Pipe Collapse under Combined Axial Tension and External Pressure. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), August 1987. http://dx.doi.org/10.55274/r0011756.

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This report documents the work accomplished during the course of a three year period. The main objective of this study was to investigate the collapse of thick-walled tubes under combined axial tension and pressure. A combined analytic and experimental approach was adopted. The D/t range of interest was 10-40. A number of collapse tests were conducted using small diameter tubing. Careful measurements of geometrical and material parameters were carried out before each collapse test. Tension-pressure collapse envelopes were obtained for tubes of different D/t. Collapse tests involving different loading paths as well as initially ovalized tubes were carried out. Specimen of lower DIt values tested at very high tensile loads showed a lack of collapse failure within the load-displacement capability of the setup.

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