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Zeitschriftenartikel zum Thema „Test specimens“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 29. Juli 2025

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1

Bahadir, Fatih, and Fatih Süleyman Balik. "Seismic Performance Improvement of 3D Reinforced Concrete Frames with Different Strengthening Applications." Applied Mechanics and Materials 789-790 (September 2015): 1140–44. http://dx.doi.org/10.4028/www.scientific.net/amm.789-790.1140.

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This study used test frames were purposely detailed and constructed with observed deficiencies in investigated dormitory buildings of Turkey. In this study, four reinforced concrete frames were produced two storeys, one bay and 3D in 1/6 geometric scale was tested. Since the studied frame was the external frame of the structure, brick infill wall with a window opening was also included. The first specimen was the reference specimen and contained no strengthening and no brick wall. The second specimen was contained brick wall. The third specimen was strengthened with internal steel panel. Final

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Deng, Jun. "Test Methods for Mechanical Properties of Structural Adhesives." Advanced Materials Research 97-101 (March 2010): 814–17. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.814.

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One of the greatest drawbacks to predicting the behaviour of bonded joints has been the lack of reliable data on the mechanical properties of adhesives. In this study, methods for determining mechanical properties of structural adhesive were discussed. The Young’s modulus, Poisson’s ratio and tensile strength of the adhesive were tested by dogbone specimens (bulk form) and butt joint specimens (in situ form). The shear modulus and shear strength were test by V-notched specimens (bulk form) and thick adherend lap-shear (TALS) joint specimens (in situ form). The test results show that the elasti

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Komorek, Andrzej, Jan Godzimirski, and Marek Rośkowicz. "Analysis of a New Shape of Test Specimen for Block Shear Impact Test." Materials 13, no. 7 (2020): 1693. http://dx.doi.org/10.3390/ma13071693.

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This paper reports and discusses an experimental comparison of metal specimens for impact strength research of adhesive connections with different shapes of the upper element. The top element of the specimen of the cuboid shape was replaced with a disc-shaped element. The experimental investigations were supplemented with dynamic numerical calculations of the tested cases. The results of the experimental studies indicate that the material applied to the produce of the top element of the block specimen deformed plastically as a result of applying the load, which further hinders the interpretati

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Parvez, Mohammad Masud, Yitao Chen, Sreekar Karnati, Connor Coward, Joseph W. Newkirk, and Frank Liou. "A Displacement Controlled Fatigue Test Method for Additively Manufactured Materials." Applied Sciences 9, no. 16 (2019): 3226. http://dx.doi.org/10.3390/app9163226.

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A novel adaptive displacement-controlled test setup was developed for fatigue testing on mini specimens. In property characterization of additive manufacturing materials, mini specimens are preferred due to the specimen preparation, and manufacturing cost but mini specimens demonstrate higher fatigue strength than standard specimens due to the lower probability of material defects resulting in fatigue. In this study, a dual gauge section Krouse type mini specimen was designed to conduct fatigue tests on additively manufactured materials. The large surface area of the specimen with a constant s

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Karcher, Donald S., and Christopher M. Lehman. "Clinical Consequences of Specimen Rejection: A College of American Pathologists Q-Probes Analysis of 78 Clinical Laboratories." Archives of Pathology & Laboratory Medicine 138, no. 8 (2014): 1003–8. http://dx.doi.org/10.5858/arpa.2013-0331-cp.

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Context.—Clinical laboratory specimens may be rejected as unsuitable for analysis for a variety of reasons and specimen rejection may have significant clinical consequences. Objective.—To quantify the clinical consequences of specimen rejection and determine the impact of laboratories' policies and practices on these consequences. Design.—Participants prospectively reviewed consecutive blood and urine specimens submitted to the chemistry and/or hematology laboratories to identify rejected specimens. For each rejected specimen, the patient's age, specimen type, testing priority, rejection reaso

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Tiernan, Peter, and Alan Hannon. "Optimisation of Cruciform Test Specimen for Biaxial Tensile Testing of Sheet Metal." Advanced Materials Research 264-265 (June 2011): 114–22. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.114.

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One of the most restricting aspects of the biaxial tensile test for sheet metal is the design of the cruciform specimen. Although specimens of the cruciform type have previoussly been investigated quite extensively, no standard geometry for the cruciform specimen exists. Using a specifically designed pantograph apparatus for operation in a standard tensile testing machine, various cruciform specimens were analysed experimentally. Finite element modelling of the specimens was also conducted to establish optimum specimen geometry. Through a process of optimisation, a standard cruciform specimen

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Mizuno, Satoshi, Toshifumi Kakiuchi, and Yoshihiko Uematsu. "Fatigue Test of Small Sized AZ31 Magnesium Alloy Using Micropillar Specimen." Key Engineering Materials 525-526 (November 2012): 165–68. http://dx.doi.org/10.4028/www.scientific.net/kem.525-526.165.

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The bending fatigue tests were performed using the small sized specimens of AZ31 magnesium alloy fabricated by the focused ion beam (FIB) processing to investigate the scale effect on the fatigue behavior. For the fatigue test of the small sized specimens, the fatigue testing apparatus was constructed by the piezo actuator and the high-resolution microscope for controlling the very small displacement. The specimen was micropillar-shaped with the rectangular cross section of 3μm x 8μm and the height of 40μm. The fatigue strengths of the small sized specimens were higher than those of the bulk s

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Mughal, Z., E. Luff, O. Okonkwo, and C. E. J. Hall. "Test, test, test – a complication of testing for coronavirus disease 2019 with nasal swabs." Journal of Laryngology & Otology 134, no. 7 (2020): 646–49. http://dx.doi.org/10.1017/s0022215120001425.

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AbstractBackgroundCoronavirus disease 2019, a highly transmissible respiratory infection, has created a public health crisis of global magnitude. The mainstay of diagnostic testing for coronavirus disease 2019 is molecular polymerase chain reaction testing of a respiratory specimen, obtained with a viral swab. As the incidence of new cases of coronavirus disease 2019 increases exponentially, the use of viral swabs to collect nasopharyngeal specimens is anticipated to increase drastically.Case reportThis paper draws attention to a complication of viral swab testing in the nasopharynx and descri

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Menu, Bruce, Marc Jolin, and Benoit Bissonnette. "Studies on the Influence of Drying Shrinkage Test Procedure, Specimen Geometry, and Boundary Conditions on Free Shrinkage." Advances in Materials Science and Engineering 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/9834159.

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Although considerable progress has been made in enhancing the use and interpretation of free ring shrinkage test, little is known about the impact of the test procedure, the specimen geometry, the surface area-to-volume (S/V) ratio exposed to drying, and the boundary conditions (sealing configuration) on the measured shrinkage. This paper highlights recent findings illustrating the influence of the test procedure, the S/V ratio exposed to drying, the geometry of specimen, and the boundary conditions. A series of experimental results are presented from free shrinkage on ring test specimens to i

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Chinnaraj, Rajesh Kumar, Minjeong Kim, Bogyu Choi, et al. "Evaluation of Reusable Thermal Protection System Materials Using a High-Velocity Oxygen Fuel Torch." Materials 17, no. 21 (2024): 5229. http://dx.doi.org/10.3390/ma17215229.

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We studied a candidate TPS (thermal protection system) material for reusable re-entry space vehicle applications. The material was based on a high-temperature-resistant material called Cerakwool. A total of six specimens were fabricated with substrate densities of 0.45 g/cm3, 0.40 g/cm3, and 0.35 g/cm3, with two specimens for each density. All specimens were coated with high-emissivity TUFI (toughened unpiece fibrous insulation), with coating thicknesses ranging from 445 to 1606 µm. The specimens were tested using an HVOF (high-velocity oxygen fuel) material ablation test facility. For each de

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Akça, Boğaçhan, Süleyman Bahadır Keskin, and Aysu Göçügenci. "Predictability of concrete damage level by non-destructive test methods." Challenge Journal of Concrete Research Letters 12, no. 4 (2021): 138. http://dx.doi.org/10.20528/cjcrl.2021.04.004.

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Non-destructive methods have many advantages over traditional test methods, especially since it does not damage the specimen, it can be used multiple times on the same specimen. These advantages also provide a great benefit in terms of following the property development in concrete as the same specimens are used which eliminates the variations related to the specimens. In this study, it is aimed to determine the damaged amount of concrete produced with different binders by electrical bulk resistivity, resonance frequency, and ultrasonic pulse velocity methods. Firstly, concretes containing dif

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Varga, Dorottya, and Attila Szlancsik. "Investigation of Miniaturized Tensile Test Specimens Manufactured by Casting." Defect and Diffusion Forum 443 (June 3, 2025): 99–105. https://doi.org/10.4028/p-d7wlz8.

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The mechanical properties of solder joints are critical for the reliability and performance of miniaturized electronic devices, as these joints provide both electrical connections and mechanical support. This study investigates the effect of specimen size on the mechanical properties of a lead-free solder alloy, Innolot, with an emphasis on microstructural differences and their impact on tensile behavior. Miniaturized and large tensile test specimens were prepared, characterized, and tested to simulate real-life application conditions. Microstructural analysis revealed that miniaturized specim

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Yeoh, O. H. "Some Geometric Considerations for Rubber—Metal Bond Test Specimens." Rubber Chemistry and Technology 79, no. 2 (2006): 320–37. http://dx.doi.org/10.5254/1.3547940.

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Abstract Most methods for predicting fatigue lives of rubber components rely heavily on experimental studies that involve specimens subjected to essentially uniform states of deformation. But, in service, rubber components often fail at or near rubber-metal bonds where the state of deformation is far from uniform. Before experimental studies of fatigue failure in the vicinity of rubber-metal bonds, it is prudent to perform an analysis of the specimen geometry to make sure it has been optimized. This paper reports on finite element analyses of cylindrical rubber-metal bond test specimens recomm

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Choi, Rihwa, Sang Gon Lee, and Eun Hee Lee. "Patient Population and Test Utilization for Thyroid Function in Local Clinics and Hospitals in Korea." Diagnostics 12, no. 7 (2022): 1638. http://dx.doi.org/10.3390/diagnostics12071638.

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We evaluated the utilization and characteristics of thyroid function test (TFT) results, including serum thyroid stimulating hormone (TSH), free thyroxine (free T4), and total triiodothyronine (total T3) in Korean adults who visited local clinics and hospitals between 2018 and 2020. We obtained TFT results for 69,575 specimens from 47,685 adult Korean patients (4878 men and 42,807 women) with a mean age of 42.7 (standard deviation of 13.2) years. Among them, 23,581 specimens were tested for TSH only, 38,447 specimens were tested for TSH and free T4 (including 17,978 specimens without total T3)

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Meneghetti, Giovanni, Carlo Dengo, and Fulvio Lo Conte. "Bending fatigue design of case-hardened gears based on test specimens." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 11 (2017): 1953–69. http://dx.doi.org/10.1177/0954406217712278.

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Different design methods against bending fatigue are reported in ISO 6336 standard. The standard suggests primarily the method based on reference test gears and provides the relevant fatigue curves. Additionally, the standard suggests the use of specimens (instead of gears) to generate the reference fatigue curves, but it also advices that specimen-based methods can be used when gears are not available and that specimens are particularly useful for comparing fatigue performances of gear materials relative to one another. The purpose of the present paper is to evaluate the accuracy of the speci

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Tayebali, Akhtarhusein A., John A. Deacon, and Carl L. Monismith. "Development and Evaluation of Dynamic Flexural Beam Fatigue Test System." Transportation Research Record: Journal of the Transportation Research Board 1545, no. 1 (1996): 89–97. http://dx.doi.org/10.1177/0361198196154500112.

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Although both mix variables and environmental variables are known to affect the fatigue response of asphalt-aggregate mixes, other factors—including specimen fabrication procedure and test equipment and procedures—are equally important. The development of a dynamic flexural beam fatigue test system is described, and the effects of specimen compaction method and equipment type on the precision of in situ fatigue lives of asphalt-aggregate mixes predicted by using laboratory strain-life relationships are discussed. Results indicate a coefficient of variation of 41 percent in fatigue life for the

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Davidson, B. D., R. Kruger, and M. König. "Three Dimensional Analysis and Resulting Design Recommendations for Unidirectional and Multidirectional End-Notched Flexure Tests." Journal of Composite Materials 29, no. 16 (1995): 2108–33. http://dx.doi.org/10.1177/002199839502901602.

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Results are presented from a theoretical investigation of the effects of stacking sequence on the energy release rate in laminated composite end-notched flexure test specimens. Deflections and energy release rates of unidirectional and multidirectional ENF specimens are obtained by classical laminated plate theory, shear deformable plate theory, and three dimensional finite element analyses. It is shown that the distribution of energy release rate varies across the front of an initially straight delamination. The percentage of mode II and mode III energy release rates for the specimen, as well

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Liu, Jia, Fengshan Ma, Jie Guo, Tongtong Zhou, Yewei Song, and Fangrui Li. "Numerical Simulation of Failure Behavior of Brittle Heterogeneous Rock under Uniaxial Compression Test." Materials 15, no. 19 (2022): 7035. http://dx.doi.org/10.3390/ma15197035.

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Rocks have formed heterogeneous characteristics after experiencing complex natural geological processes. Studying the heterogeneity of rocks is significant for rock mechanics. In this study, a linear parallel bond model with Weibull distribution in two-dimensional particle flow code (PFC2D) is adopted to study the mechanical characteristics and brittle failure mode of granite rock specimens with different heterogeneity. Firstly, we selected several combinations of key micro-parameters of the parallel bond model. Then, we subjected them to a Weibull distribution to satisfy heterogeneity, respec

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Doerffel, Christoph, Gábor Jüttner, and Roland Dietze. "Micro Test Specimens for Compound Engineering with Minimum Material Needs." Materials Science Forum 825-826 (July 2015): 928–35. http://dx.doi.org/10.4028/www.scientific.net/msf.825-826.928.

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The use of micro test specimens is a good way to characterize micro injection molding processes and the resulting material properties. The material properties of microparts may differ from standard injection molding parts, due to an overrepresentation of the surface layers with high fiber orientation and divergent morphology. In order to characterize the distribution and agglomeration of fibers and particles for the manufacturing of micro injection molding parts of functionalized polymer compounds, it is essential to manufacture the test specimens and the part using the same process. The distr

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Agung, Mataram, Rizal Samsul, and Zamheri Ahmad. "COMPOSITE MATRIX POLYESTER REINFORCE FIBRESKIN GELAM; PREPARATION AND MECHANICAL PROPERTIES." AUSTENIT 7, no. 1 (2015): 7–12. https://doi.org/10.5281/zenodo.4547530.

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Gelam (melaleuca leucandendra) is one plant that is widely available in South Sumatra potential into cellulose extraction. His plant is widely used for building materials and wood products processed the rest of the powder timber furniture industry. While, the skin of this plant is not used for anything. In fact, from  the structure of the skin that have fiber, skin of gelam  has the potential to be a valuable product, one of them with a matter in the form of composite reinforcement. While today's technology demands urgent environmental friendly technology product makers, especial

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Xu, Jia Xiong. "Analysis of Displacement Field of Asphalt Mixture in Uniaxial Compression Test." Applied Mechanics and Materials 423-426 (September 2013): 1055–58. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.1055.

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In this paper, digital imaging technology is used to research the specimen deformation in asphalt mixture unconfined compressive strength test. We compare of the differences in the average vertical strain with a narrower range of local under three groups different specimens conditions, diameter height ratio of 1:1 specimens which are of specification and end untreateddiameter height ratio of 1:1 specimens which are wax to seal the deal and diameter height ratio of 1:1.5 specimens which are end untreated. We discover that the first two states can be easier to achieve the relatively stable state

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Liew, Li-Anne, David T. Read, and Nicholas Barbosa. "Bend testing of micro-scale bulk metal specimens using a chip-scale test instrument." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2015, DPC (2015): 000827–64. http://dx.doi.org/10.4071/2015dpc-tp36.

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We describe bend testing on micro-scale specimens of 302 stainless steel, using a MEMS test instrument. Bend testing is a common way of measuring the flexural stiffness of structural materials across many size scales, from thin laminate sheets to large weldments. Whereas the stiffness of a material under tensile loading is given by the Young's Modulus, the flexural stiffness, or the stiffness in bending, is much lower. In the past two decades, conventional materials testing machines and the specimens themselves have undergone miniaturization for the purpose of evaluating the mechanical propert

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Pei, Junjie, Jinchang Zhao, and Shaoqing Niu. "Shape Effect and Accuracy Analysis of Rock Tensile Strength Test." Applied Sciences 15, no. 5 (2025): 2477. https://doi.org/10.3390/app15052477.

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To investigate the influence of shape effects on the tensile strength of rocks, splitting tests were conducted on disc specimens with the same thickness-to-diameter ratio but different diameters using physical similarity simulation and numerical simulation experiments. Additionally, finite element analysis software was employed to perform numerical simulation tests on two types of dumbbell-shaped specimens involved in direct tensile tests of rocks. This study revealed that when the thickness-to-diameter ratio is fixed at 0.5, the splitting tensile strength decreases gradually as the specimen d

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Seah, Yew Heng Sherman, and Eng Choon Leong. "Effects of geometry of soil specimens on the formation of desiccation cracks." E3S Web of Conferences 544 (2024): 01010. http://dx.doi.org/10.1051/e3sconf/202454401010.

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Desiccation cracks in soils are important in engineering structures that need hydraulic integrity such as earth dams, and containment facilities. At the element test level, such cracks are a hindrance when the volume change of the soil specimen needs to be measured during the test. One such test is the volumetric shrinkage test where the volume of the soil specimen needs to be continuously determined together with its mass change as the soil specimen dries. The soil specimen may deform non-uniformly. Previously hazardous and cumbersome methods using mercury or wax are needed to determine the v

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Handana, M. A. P., B. Surbakti, D. D. Harisdani, R. Karolina, and D. Fahreza. "Tensile strength of various bamboo species tested with different shape of test specimens." Journal of Physics: Conference Series 2421, no. 1 (2023): 012026. http://dx.doi.org/10.1088/1742-6596/2421/1/012026.

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Abstract Bamboo has a different tensile strength at the bottom, middle and top, both at the node and internode part of the bamboo. Tensile strength obtained by tension test with several standard testing methods that use different specimen shapes in the testing process. This study compared standard test methods that use dog bone-shaped specimens and strip-shaped specimens to see the correction of the tensile strength of bamboo from the same culm but tested differently. The test specimens are carried out from the area of Asahan Regency (including Tanjung Balai City), Batubara Regency, and Simalu

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Zelepugin, Sergey A., Nadezhda V. Pakhnutova, Olga A. Shkoda, and Evgenii N. Boyangin. "Experimental Study of the Microhardness and Microstructure of a Copper Specimen Using the Taylor Impact Test." Metals 12, no. 12 (2022): 2186. http://dx.doi.org/10.3390/met12122186.

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One commonly used method for characterizing the dynamic characteristics of materials is the Taylor impact test. This method measures the dynamic yield strength of cylindrical specimens and determines material model constants required for the numerical simulation of the behavior of materials subjected to high-velocity deformation. The purpose of this work is to investigate the microhardness and microstructure of copper specimens at different impact velocities using the Taylor impact test. This paper describes experiments performed on copper specimens (OFHC 99.9%, M1) using a single-stage light-

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Lee, Kangjin, Sonja Pape, Cassie Castorena, and Y. Richard Kim. "Evaluation of Small Specimen Geometries for Asphalt Mixture Performance Testing and Pavement Performance Prediction." Transportation Research Record: Journal of the Transportation Research Board 2631, no. 1 (2017): 74–82. http://dx.doi.org/10.3141/2631-09.

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The use of small specimen geometries in asphalt mixture performance testing to enable the testing of as-built pavement layers has been gaining attention in recent years. Small specimens could also improve the testing efficiency of laboratory-fabricated specimens by allowing the extraction of multiple test specimens per gyratory-compacted sample. Rigorous assessment of the small specimen geometries is required before the use of such geometries is standardized. In this study, small specimens were evaluated for dynamic modulus and simplified viscoelastic continuum damage fatigue. Three specimen g

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Watanabe, Satoru, Yoshiki Ishida, Daisuke Miura, Taira Miyasaka, and Akikazu Shinya. "Development of a Weight-Drop Impact Testing Method for Dental Applications." Polymers 12, no. 12 (2020): 2803. http://dx.doi.org/10.3390/polym12122803.

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For evaluating the impact strength of dental materials, the Izod test or Charpy test has been used, but specimen preparation for these tests is difficult due to the adjustment of a notch on them. By contrast, a weight-drop impact test does not require notched specimens. Therefore, it might be possible to measure the impact strength more accurately than conventional methods. This study aimed to establish appropriate conditions for applying the weight-drop impact test on small specimens of acrylic resin. To determine the most reliable impact fracture energy of acrylic resins, different diameters

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Taggart, E. William, Carrie L. Byington, David R. Hillyard, John E. Robison, and Karen C. Carroll. "Enhancement of the AMPLICOR Enterovirus PCR Test with a Coprecipitant." Journal of Clinical Microbiology 36, no. 11 (1998): 3408–9. http://dx.doi.org/10.1128/jcm.36.11.3408-3409.1998.

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The incorporation of a commercially available coprecipitant into the AMPLICOR enterovirus PCR test specimen preparation enhanced the sensitivity and reproducibility of this assay. Fifty-five previously tested archived cerebrospinal fluids (CSF) specimens were tested in a blind study in duplicate with and without Pellet Paint coprecipitant (Novagen, Inc., Madison, Wis.). Of these specimens, 26 had previously been determined to be positive and 29 had previously been determined to be negative. All previously positive CSF specimens were positive when Pellet Paint was used and only 18 were positive

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Stanley, P., and C. Karroum. "An evaluation of mechanical strength test specimens for brittle materials." Journal of Strain Analysis for Engineering Design 27, no. 2 (1992): 101–11. http://dx.doi.org/10.1243/03093247v272101.

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Several alternative test specimens for the determination of the fracture strength of a brittle material have been studied. These include a ring-supported ball-loaded thin circular disc, a disc symmetrically supported on three equispaced balls and loaded at the centre through a fourth ball, a cylinder under axial compressive point-loading, and a ‘pure shear’ beam specimen. The stress distributions in these specimens have been determined photoelastically and the stress data used to interpret fracture test data for batches of each specimen made from reactor-grade graphite. The stochastic nature o

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Chen, Jian, Yong Hao Fang, and Cheng Hui Zhu. "Effect of Shape and Size of Concrete Specimens on Test Result of Chloride Migration Coefficient." Applied Mechanics and Materials 395-396 (September 2013): 520–23. http://dx.doi.org/10.4028/www.scientific.net/amm.395-396.520.

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The chloride migration coefficients of concrete specimens with different shapes and different sizes were tested with modified rapid chloride migration test. The results indicate that the shape and thickness of concrete specimens slightly affect the test results of chloride migration coefficient of concrete specimens; When the size of the diffusion face of the specimen is larger than the electrode plates of the cell, the measured chloride migration coefficient will be a little smaller. The thickness, thus the electrode space also has effect on the test results, the thicker the specimen, the sma

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Muraya, P. M. "Homogeneous test specimens from gyratory compaction." International Journal of Pavement Engineering 8, no. 3 (2007): 225–35. http://dx.doi.org/10.1080/10298430701289323.

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Dinnis, Alan R., and J. Thomas M. Stevenson. "Test specimens for SEM voltage contrast." Microelectronic Engineering 3, no. 1-4 (1985): 203–10. http://dx.doi.org/10.1016/0167-9317(85)90029-2.

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Garcia, Victor M., and Alejandro Miramontes. "Understanding Sources of Variability of Overlay Test Procedure." Transportation Research Record: Journal of the Transportation Research Board 2507, no. 1 (2015): 10–18. http://dx.doi.org/10.3141/2507-02.

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“Fatigue cracking” is defined as the accumulation of reflective cracking on hot-mix asphalt (HMA) layers under the repeated application of vehicular loads combined with climatic effects. Several highway agencies have either implemented or considered implementing the overlay tester (OT) to evaluate the fatigue cracking resistance of HMA specimens as a function of the number of cycles that the specimen may resist during the test until a reflective crack appears and propagates. The repeatability of the number of cycles to failure measured with the OT is considered as one of the main challenges in

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Adebayo, Adeyinka, Joseph Temitope Stephen, and Gbenga Joshua Adeyemi. "Effects of Local Cooling Media on the Mechanical Properties of Heat Treated Mild Steel." European Journal of Engineering Research and Science 3, no. 4 (2018): 27. http://dx.doi.org/10.24018/ejers.2018.3.4.655.

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This paper reports the effects of local cooling media (groundnut oil, palm oil, shea butter and air) on the mechanical properties of heat treated mild steel. Tensile test, hardness test and microstructural analysis were carried out on the heat treated and as-purchased specimens. The results show significant differences in the mechanical properties of the heat treated specimens. The hardness profile showed higher values for palm oil-cooled, shea butter-cooled, and the groundnut oil-cooled specimens in an increasing of order respectively when compared with as-purchased specimen with 194.9 VHN, w

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Adebayo, Adeyinka, Joseph Temitope Stephen, and Gbenga Joshua Adeyemi. "Effects of Local Cooling Media on the Mechanical Properties of Heat Treated Mild Steel." European Journal of Engineering and Technology Research 3, no. 4 (2018): 27–31. http://dx.doi.org/10.24018/ejeng.2018.3.4.655.

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This paper reports the effects of local cooling media (groundnut oil, palm oil, shea butter and air) on the mechanical properties of heat treated mild steel. Tensile test, hardness test and microstructural analysis were carried out on the heat treated and as-purchased specimens. The results show significant differences in the mechanical properties of the heat treated specimens. The hardness profile showed higher values for palm oil-cooled, shea butter-cooled, and the groundnut oil-cooled specimens in an increasing of order respectively when compared with as-purchased specimen with 194.9 VHN, w

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Vincelette, Jean, Jurjen Schirm, Marc Bogard, et al. "Multicenter Evaluation of the Fully Automated COBAS AMPLICOR PCR Test for Detection of Chlamydia trachomatis in Urogenital Specimens." Journal of Clinical Microbiology 37, no. 1 (1999): 74–80. http://dx.doi.org/10.1128/jcm.37.1.74-80.1999.

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The fully automated COBAS AMPLICOR CT/NG test for the detection ofChlamydia trachomatis was evaluated in a multicenter trial. Test performance was evaluated for 2,014 endocervical swab and 1,278 urine specimens obtained from women and for 373 urethral swab and 254 urine specimens obtained from men. Culture served as the reference test. Culture-negative, COBAS AMPLICOR-positive specimens that tested positive in a confirmatory PCR test for an alternative target sequence within the C. trachomatis major outer membrane protein gene were resolved as true positives. The overall prevalence of chlamydi

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Tuominen, Eero, and Juha Vinha. "Ruggedness test made with mortars by free water intake test." Journal of Physics: Conference Series 2654, no. 1 (2023): 012036. http://dx.doi.org/10.1088/1742-6596/2654/1/012036.

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Abstract Capillary movement in porous building materials is modelled by unsaturated flow. Material property needed for the calculations is liquid water diffusivity which is usually estimated by water absorption coefficient and capillary saturation moisture content. While determining of water absorption coefficient can be done according to EN-ISO 15148:2002 there is still lack of knowledge about sources of uncertainty in the experiment. In this paper author presents results of ruggedness tests done with mortar. The sources of errors investigated here was the shape and water inflow area of the s

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Irawan, Benny Haddli, Nugroho Pratomo Ariyanto, and Jonas Felix Siregar. "Destructive Test Material SA516 70N Untuk Kualifikasi Pengelasan Standar ASME BPVC Sec. IX-2021." Jurnal Teknik Mesin 16, no. 2 (2023): 133–38. http://dx.doi.org/10.30630/jtm.16.2.1209.

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This research contains about destructive test for WPS qualification (welding qualification record) in making pressure vessel. WPS can be declared qualified if they have PQR (procedure qualification record). In making PQR required testing destructive test the test is carried out by damaging the specimen based on ASME standards (american society of mechanical engineers) BPVC (boiler pressure vessel code) Sec. IX-2021 with SA516 70N material. Indestructive test for this welding qualification, there are 4 types of testing with the number of specimens to be tested, namely: testing tensile (2 specim

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RYCHLIK, Arkadiusz, Krzysztof LIGIER, and Władysław KOZUBEL. "EFFECT OF HOLE-FORMING TECHNOLOGY ON THE DESTRUCTION OF MATERIAL DD11 USED TO MANUFACTURE WHEEL DISCS." Tribologia 279, no. 3 (2018): 113–21. http://dx.doi.org/10.5604/01.3001.0012.7019.

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This study presents the results of comparative tests concerning the destruction process of specimens made of material DD11, for which different hole-forming technologies (i.e. drilling and piercing) were applied. For the analysis of cross-sectional properties of a specimen in the process of destruction, relative vibrations of the specimen’s free end as a function of vibrations of a forcing mechanism (vibration inductor) were selected as the diagnostic signal. The tests were carried out on a test stand on which the destruction process of the material’s cross-section was induced by the specimen’

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Chinnaraj, Rajesh Kumar, Young Chan Kim, and Seong Man Choi. "Thermal Ablation Experiments of Carbon Phenolic and SiC-Coated Carbon Composite Materials Using a High-Velocity Oxygen-Fuel Torch." Materials 16, no. 5 (2023): 1895. http://dx.doi.org/10.3390/ma16051895.

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For future spacecraft TPS (heat shield) applications, ablation experiments of carbon phenolic material specimens with two lamination angles (0° and 30°) and two specially designed SiC-coated carbon–carbon composite specimens (with either cork or graphite base) were conducted using an HVOF material ablation test facility. The heat flux test conditions ranged from 3.25 to 11.5 MW/m2, corresponding to an interplanetary sample return re-entry heat flux trajectory. A two-color pyrometer, an IR camera, and thermocouples (at three internal locations) were used to measure the specimen temperature resp

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Martín, Vicente, Jesús Vázquez, Carlos Navarro, and Jaime Domínguez. "Fretting-Fatigue Analysis of Shot-Peened Al 7075-T651 Test Specimens." Metals 9, no. 5 (2019): 586. http://dx.doi.org/10.3390/met9050586.

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Shot peening is a mechanical treatment that induces several changes in the material: surface roughness, increased hardness close to the surface, and, the most important, compressive residual stresses. This paper analyzes the effect of this treatment on alloy Al 7075-T651 in the case of fretting fatigue with cylindrical contact through the results of 114 fretting fatigue tests. There are three independent loads applied in this type of test: a constant normal load N, pressing the contact pad against the specimen; a cyclic bulk stress σ in the specimen; and a cyclic tangential load Q through the

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Guo, Jianxiang, and Xiaobin Wei. "The Influence of Soil Saturation on the Geotechnical Test Results." Advances in Civil Engineering 2022 (May 4, 2022): 1–6. http://dx.doi.org/10.1155/2022/7438757.

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The consistency limits are important properties of soil. The fall cone test method has a good repeatability, and the operator’s judgement has little effect on the results. This paper presents a new sample preparation method, in which the sedimentation method and consolidation test are combined, to prepare the saturated specimens for fall cone test for determining the consistency limits, and the sample prepared by this new method can be considered completely saturated. For the specimens prepared by the previous sample preparation method, the decrease in the water content leads to a decrease in

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Chaney, RC, KR Demars, TE Cotten, MM Davis, and CD Shackelford. "Effects of Test Duration and Specimen Length on Diffusion Testing of Unconfined Specimens." Geotechnical Testing Journal 21, no. 2 (1998): 79. http://dx.doi.org/10.1520/gtj10746j.

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Seok, Chang Sung, Jae Sil Park, Hyung Ick Kim, Young Min Lee, Won Hak Cho, and Weon Keun Song. "Evaluation of Fatigue Characteristic of a Real Waterworks Pipe." Key Engineering Materials 297-300 (November 2005): 2471–76. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.2471.

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The fatigue characteristic of a material or a structure is derived from fatigue tests of standard specimens. However, many researches have reported that test results of standard specimens are very different from those of real structures or components. One reason for this difference is the constraint effects according to the geometrical difference. Therefore, to calculate more accurate fatigue life, the constraint effect must be considered by comparing test results of standard specimens with those of real structures or components. Another reason for this difference is the surface condition. All

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Yang, Shan, Zhiyong Zhou, Yifei Zhao, and Wei Yang. "Study on Dynamic Mechanical Properties of Full Tailings Cemented Backfilling Impacted by Cement-Sand Ratio." Advances in Civil Engineering 2018 (September 23, 2018): 1–8. http://dx.doi.org/10.1155/2018/7184720.

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In order to study the effect of cement-sand ratio on the dynamic mechanical properties of the full tailings cemented backfilling, three sets of full tailings cemented backfilling specimens with different cement-sand ratios were prefabricated. The uniaxial impact of the prefabricated specimens was performed by the Ф50 mm SHPB test system. Test results showed that full tailings cemented backfilling had strong reflection and damping effects on elastic wave propagation. At lower strain rates, specimens presented strength hardening, and at higher strain rates, the test specimens presented rapid-sof

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Husain, Syed Faizan, Mohammad Shoaib Abbas, Han Wang, et al. "A Laboratory-Scale Evaluation of Smart Pebble Sensors Embedded in Geomaterials." Sensors 24, no. 9 (2024): 2733. http://dx.doi.org/10.3390/s24092733.

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This paper introduces a novel approach to measure deformations in geomaterials using the recently developed ‘Smart Pebble’ sensors. Smart Pebbles were included in triaxial test specimens of unbound aggregates stabilized with geogrids. The sensors are equipped with an aggregate particle/position tracking algorithm that can manage uncertainty arising due to signal noise and random walk effects. Two Smart Pebbles were placed in each test specimen, one at specimen’s mid-height, where a geogrid was installed in the mechanically stabilized specimen, and one towards the top of the specimen. Even with

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Todsen, Tobias, Kathrine K. Jakobsen, Mathias Peter Grønlund, et al. "COVID-19 Rapid Antigen Tests With Self-Collected vs Health Care Worker–Collected Nasal and Throat Swab Specimens." JAMA Network Open 6, no. 12 (2023): e2344295. http://dx.doi.org/10.1001/jamanetworkopen.2023.44295.

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ImportanceSelf- or health care worker (HCW)–collected nasal swab specimens are the preferred sampling method to perform rapid antigen testing for COVID-19, but it is debated whether throat specimens can improve test sensitivity.ObjectiveTo compare the diagnostic accuracy of self- and HCW-collected nasal vs throat swab specimens for COVID-19 rapid antigen testing.Design, Setting, and ParticipantsThis per-protocol multicenter randomized clinical trial was conducted from February 15 through March 25, 2022. The participants, individuals aged 16 years or older requesting a COVID-19 test for diagnos

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Wang, Qingli, Jie Zhao, and Kuan Peng. "Test on Compressive Performance of Hollow Concrete-Filled Sandwich Circular Steel Tubes Connected by Thread." Metals 13, no. 7 (2023): 1207. http://dx.doi.org/10.3390/met13071207.

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The connection method of lengthening the steel tube of hollow concrete-filled sandwich circular steel tubes and threaded connections is proposed. The length, depth and position are the basic parameters. Twelve hollow concrete sandwich circular steel pipes with threaded connections were designed and subjected to axial compression tests. The axial compressive loading–longitudinal compressive displacement curves, axial compressive loading strain of steel tube curves and failure mode of the specimens are analyzed, and the effects of different parameters on the axial compressive-bearing capacity an

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Hudyma, Nick, B. Burçin Avar, and Bhaskar Chittoori. "Influence of Schistosity Orientation on Failure Mode and Indirect Tensile Strength of Mica Schist." Geotechnics 3, no. 3 (2023): 937–54. http://dx.doi.org/10.3390/geotechnics3030050.

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The indirect tension test is an important laboratory test for rock characterization. The presence of rock fabric, such as schistosity, complicates the assessment of test results. One hundred and forty-five indirect tension tests were conducted on mica schist specimens to investigate the effect of schistosity orientation on failure mode and tensile strength. Tensile strength results did not provide a clear relationship between schistosity orientation and tensile strength, so the failure patterns were investigated. A new naming scheme for failure modes was developed, incorporating fracture patte

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