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Journal articles on the topic 'Open Hole Tensile Testing'

Author: Grafiati

Published: 6 September 2023

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1

Sanei, Seyed HR, Andrew Arndt, and Randall Doles. "Open hole tensile testing of 3D printed continuous carbon fiber reinforced composites." Journal of Composite Materials 54, no. 20 (2020): 2687–95. http://dx.doi.org/10.1177/0021998320902510.

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In this study, the effects of stress concentration on the tensile properties of a 3D printed carbon fiber-nylon composite were investigated. The samples were 3D printed with continuous carbon fiber and chopped fiber reinforced nylon. Samples were manufactured with four different open hole sizes as 3. 175 mm (⅛ in), 6.35 mm (¼ in), 9.25 mm (⅜ in), and 12.7 mm (½ in). Five samples were manufactured for each hole size group. Continuous carbon fibers were printed in the longitudinal direction. Additional reinforcements were placed around the periphery of the open hole. Samples were tested under un

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2

Bale, J. "Damage Behaviour and Stress Concentration Factor of Open Hole Tensile (OHT) Glass Fibre Reinforced Polymer (GFRP) Composites." International Journal of Automotive and Mechanical Engineering 16, no. 4 (2019): 7299–314. http://dx.doi.org/10.15282/ijame.16.4.2019.09.0543.

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In many applications of composites, open-hole frequently includes for various purposes. However, further study on open-hole behaviour is still required, including on its strength and damage properties by combining experimental testing, real-time observations and calculations based on theoretical analysis and simulation model. The objective of this study is to understand the effect of an open-hole glass fibre reinforced polymer (GFRP) composites on tensile (static) properties, damage behaviour through Non-destructive Testing (NDT) Thermography and stress concentration factor (SCF). This study u

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Dave, Harshit K., Ashish R. Prajapati, Shilpesh R. Rajpurohit, Naushil H. Patadiya, and Harit K. Raval. "Open hole tensile testing of 3D printed parts using in-house fabricated PLA filament." Rapid Prototyping Journal 26, no. 1 (2020): 21–31. http://dx.doi.org/10.1108/rpj-01-2019-0003.

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Purpose Fused deposition modeling (FDM) is being increasingly used in automotive and aerospace industries because of its ability to produce specimens having difficult geometrical shape. However, owing to lack of critical information regarding the reliability and mechanical properties of FDM-printed parts at various designs, the use of 3D printed parts in these industries is limited. Therefore, the purpose of this paper is to investigate the impact of process parameters of FDM on the tensile strength of open-hole specimen printed using in-house-fabricated polylactic acid (PLA). Design/methodolo

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Zhang, Xiao Qiong, Wei Guo Guo, and De Shuan Kong. "Damage Analysis of 2D Woven Composite Laminates Containing an Open-Hole under Tensile Loadings." Key Engineering Materials 525-526 (November 2012): 373–76. http://dx.doi.org/10.4028/www.scientific.net/kem.525-526.373.

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In order to understand damage mechanism, the influences of lay-up construction of laminates and environgment on tension behavior of 2D woven composite laminates with an open-hole, which was manufactured by a new technology, uniaxial tension tests are performed in 3 different environments on 4 kinds of lay-up specimens, using a WE-50 electromechanical universal material testing machines. The fracture of specimens are analysed through micrographic observations. The result show that there is a large difference both in tensile strength and damage mechanism due to different kinds of lay-up specimen

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Strungar, Elena, Dmitrii Lobanov, and Valery Wildemann. "Evaluation of the Sensitivity of Various Reinforcement Patterns for Structural Carbon Fibers to Open Holes during Tensile Tests." Polymers 13, no. 24 (2021): 4287. http://dx.doi.org/10.3390/polym13244287.

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This paper is devoted to the experimental study of polymeric composite specimens, with various types of reinforcement, in order to evaluate the breaking strength of specimens with open holes when undergoing uniaxial compression and tensile tests. Four types of interlaced 3D woven preforms were considered (orthogonal, orthogonal combined, with pairwise inter-layer reinforcement, and with pairwise inter-layer reinforcement and a longitudinal layer), with a layered preform used for comparison. Tensile tests of solid specimens without a hole, under ASTM D 3039, and of specimens with an open hole,

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Hallett, Stephen R., Ben G. Green, Wen-Guang Jiang, Kin Hei Cheung, and Michael R. Wisnom. "The open hole tensile test: a challenge for virtual testing of composites." International Journal of Fracture 158, no. 2 (2009): 169–81. http://dx.doi.org/10.1007/s10704-009-9333-8.

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Bale, Jefri, Emmanuel Valot, Martine Monin, Olivier Polit, Claude Bathias, and Tresna Soemardi. "Tomography Observation of Fiber Reinforced Composites after Fatigue Testing." Applied Mechanics and Materials 799-800 (October 2015): 937–41. http://dx.doi.org/10.4028/www.scientific.net/amm.799-800.937.

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This work presented an experimental study to observe the inside conditions and damage appearances of fiber reinforced composites material by non destructive testing (NDT) method. In order to achieve this, an open hole specimen of unidirectional glass fiber composite (GFRP) and discontinuous carbon fiber composite (DCFC) had been using as the specimen test under tensile fatigue loading and observed using post failure monitoring techniques of NDT namely computed tomography (CT) scan. The results shown that the tomography observation based on segmentation method of gray value gives a good detecti

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Iragi, M., C. Pascual-González, A. Esnaola, et al. "Design, manufacturing and testing of 3D printed variable-stiffness laminates for improved open-hole tensile behaviour." Additive Manufacturing 63 (February 2023): 103418. http://dx.doi.org/10.1016/j.addma.2023.103418.

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Bale, Jefri, Emmanuel Valot, Martine Monin, et al. "Damage Observation of Glass Fiber/Epoxy Composites Using Thermography and Supported by Acoustic Emission." Applied Mechanics and Materials 627 (September 2014): 187–90. http://dx.doi.org/10.4028/www.scientific.net/amm.627.187.

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This work presents an experimental study to monitor the damage propagation of composite material by non destructive testing (NDT) method. In order to achieve this, an open hole condition of glass fiber/epoxy composite has been used as the specimen test under static tensile loading and observed using two different real-time monitoring techniques of NDT namely infra-red (IR) camera and supported by Acoustic Emission. The results show that the thermal response and acoustic emission signals give a good detection on damage appearance and damage propagation of glass fiber/epoxy composite under stati

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10

Farrow, I. R., J. Lee, and C. D. Kong. "Flexural Testing of Composite Laminates for Drilling Trial Assessment." Advanced Composites Letters 9, no. 4 (2000): 096369350000900. http://dx.doi.org/10.1177/096369350000900403.

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This work presents a study of flexural testing as a convenient method for ranking drilling trials of composite materials. The work includes an experimental study of drilling parameter effects on composite laminate hole quality as measured by static tension, compression and flexural open hole tests. Flexural testing and results processed in terms of the outermost 0° layer provides a consistent ranking of holes drilled with different process parameters despite only subtle changes in static notched strength for the thick composite samples tested. Specific observations from flexural tests are cons

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Elbadry, Elsayed A., GA Abdalla, M. Aboraia, and EA Oraby. "Notch sensitivity of short and 2D plain woven glass fibres reinforced with different polymer matrix composites." Journal of Reinforced Plastics and Composites 36, no. 15 (2017): 1092–98. http://dx.doi.org/10.1177/0731684417702529.

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This research article investigated the notch sensitivity of two different glass fibre architectures, namely short and 2D plain-woven glass fibres reinforced with unsaturated polyester and epoxy matrix composites fabricated by the hand lay-up technique. This was carried out through open hole tension tests at different ratios of the specimen hole diameter to the specimen with three different values (0.1, 0.2, 0.5) compared to the unnotched specimen. The notch sensitivity of these composites was evaluated using the residual tensile strength by the application of Whitney–Nuismer Mathematical Model

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Jiang, Xiao-Wei, Hai Wang, and Shijun Guo. "Peridynamic Open-Hole Tensile Strength Prediction of Fiber-Reinforced Composite Laminate Using Energy-Based Failure Criteria." Advances in Materials Science and Engineering 2019 (January 20, 2019): 1–14. http://dx.doi.org/10.1155/2019/7694081.

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In the present study, peridynamic (PD) open-hole tensile (OHT) strength prediction of fiber-reinforced composite laminate using energy-based failure criteria is conducted. Spherical-horizon peridynamic laminate theory (PDLT) model is used. Energy-based failure criteria are introduced into the model. Delamination fracture modes can be distinguished in the present energy-based failure criteria. Three OHT testing results of fiber-reinforced composite laminate are chosen from literatures and used as benchmarks to validate the present PD composite model with energy-based failure criteria. It is sho

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Seon, Guillaume, Andrew Makeev, Joseph D. Schaefer, and Brian Justusson. "Measurement of Interlaminar Tensile Strength and Elastic Properties of Composites Using Open-Hole Compression Testing and Digital Image Correlation." Applied Sciences 9, no. 13 (2019): 2647. http://dx.doi.org/10.3390/app9132647.

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Advanced polymeric composites are increasingly used in high-performance aircraft structures to reduce weight and improve efficiency. However, a major challenge delaying the implementation of the advanced composites is the lack of accurate methods for material characterization. Accurate measurement of three-dimensional mechanical properties of composites, stress–strain response, strength, fatigue, and toughness properties, is essential in the development of validated analysis techniques accelerating design and certification of composite structures. In particular, accurate measurement of the thr

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Stock, Johannes W., and Johanna Kerschreiter. "Modelling the Stress Concentration in CFRP at Notches with a Thermally Influenced Cut Edge." Advanced Materials Research 1140 (August 2016): 288–95. http://dx.doi.org/10.4028/www.scientific.net/amr.1140.288.

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The use of higher laser powers in laser cutting of CFRP results in both an increase of productivity and in a growth of the heat affected zone at the cut edge. This thermal damage was related to a loss of the static strength due to the reduce load bearing cross section in various studies. In contrast, the thermal damage caused an increase of the average number of load cycles and to a significant reduction of the deviation among the repetitions of each parameter during dynamic open hole tensile testing in recent studies. To explain this positive influence of laser cutting on the fatigue behaviou

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Dall’Asta, E., V. Ghizzardi, R. Brighenti, E. Romeo, R. Roncella, and A. Spagnoli. "New experimental techniques for fracture testing of highly deformable materials." Frattura ed Integrità Strutturale 10, no. 35 (2015): 161–71. http://dx.doi.org/10.3221/igf-esis.35.19.

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A new experimental method for measuring strain fields in highly deformable materials has been developed. This technique is based on an in-house developed Digital Image Correlation (DIC) system capable of accurately capturing localized or non-uniform strain distributions. Thanks to the implemented algorithm based on a Semi-Global Matching (SGM) approach, it is possible to constraint the regularity of the displacement field in order to significantly improve the reliability of the evaluated strains, especially in highly deformable materials. Being originally introduced for Digital Surface Modelli

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Clay, Stephen B., and Philip M. Knoth. "Experimental results of quasi-static testing for calibration and validation of composite progressive damage analysis methods." Journal of Composite Materials 51, no. 10 (2016): 1333–53. http://dx.doi.org/10.1177/0021998316658539.

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The Air Force Research Laboratory directed a research program to evaluate nine different composite progressive damage analysis methods under both quasi-static and fatigue loading. This paper describes the coupon tests that were performed at the Air Force Research Laboratory for calibration and validation of the methods under quasi-static conditions. The basic elastic and failure properties of unidirectional IM7/977-3 graphite/epoxy were first determined in order to properly calibrate the models. Validation tests were then performed on unnotched and open-hole coupons with three different lamina

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Nobile, R., F. W. Panella, A. Pirinu, and A. Saponaro. "Full-field monitoring methods for damage analysis on aeronautical CFRP specimens under fatigue loads." IOP Conference Series: Materials Science and Engineering 1214, no. 1 (2022): 012008. http://dx.doi.org/10.1088/1757-899x/1214/1/012008.

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Abstract The present paper is focused on full-field experimental monitoring procedures to be employed during HCF fatigue testing on two series of CFRP open hole samples. Two different experimental methodologies based on thermographic techniques and displacement measurements with Digital Image Correlation (DIC) analysis are employed for damage settlement and evolution to be detected up to failure, together with correspondent compliance analysis. Combined monitoring approaches, based on thermo-elastic and dissipative phenomena, together with stiffness properties variations, are claimed to offer

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18

Chen, Jian, Xiongfei Li, Wei Li, et al. "Research on energy absorption properties of open-cell copper foam for current collector of Li-ions." Materials Science-Poland 37, no. 1 (2019): 8–15. http://dx.doi.org/10.2478/msp-2019-0011.

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AbstractQuasi-static uniaxial compressive tests of open-cell copper (Cu) foams (OCCF) were carried out on an in-situ bi-direction tension/compress testing machine (IBTC 2000). The effects of strain rate, porosity and pore size on the energy absorption of open-cell copper foams were investigated to reveal the energy absorption mechanism. The results show that three performance parameters of open-cell copper foams (OCCF), involving compressive strength, Young modulus and yield stress, increase simultaneously with an increase of strain rate and reduce with increasing porosity and pore size. Furth

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19

Builes Cárdenas, Cristian, Vincent Gayraud, Maria Eugenia Rodriguez, et al. "Study into the Mechanical Properties of a New Aeronautic-Grade Epoxy-Based Carbon-Fiber-Reinforced Vitrimer." Polymers 14, no. 6 (2022): 1223. http://dx.doi.org/10.3390/polym14061223.

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The current drive for sustainability demands recyclable matrices for composite materials. Vitrimers combine thermoset properties with reprocessability, but their mechanical performance in highly loaded applications, for instance, composites for aeronautics, is still to be demonstrated. This work presents the complete mechanical characterization of a new vitrimer reinforced with carbon fiber. This vitrimer formulation consists of functional epoxy groups and a new dynamic disulfide crosslinks-based hardener. The testing campaign for the vitrimer composites encompassed tension, compression, inter

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Clay, Stephen B., and Philip M. Knoth. "Experimental results of fatigue testing for calibration and validation of composite progressive damage analysis methods." Journal of Composite Materials 51, no. 15 (2016): 2083–100. http://dx.doi.org/10.1177/0021998316670132.

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The Air Force Research Laboratory led a research effort to benchmark the accuracy of static and fatigue predictions of several emerging composite progressive damage analysis techniques. The static portion of this technical effort is described in detail in a previous special issue of the Journal of Composite Materials. This paper provides the details of the fatigue experiments that were conducted to calibrate and validate the computational models. Initially, in-plane and out-of-plane S–N curves were generated through coupon tests that were performed on unidirectional laminae. The challenges exp

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Steinbach, Frank, Alper Güner, and A. Erman Tekkaya. "Dry Shearing of Micro-Alloyed Steels." Key Engineering Materials 622-623 (September 2014): 1058–65. http://dx.doi.org/10.4028/www.scientific.net/kem.622-623.1058.

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In the production process of sheet metal parts, oil is widely used as lubricant, not only in sheet metal forming but also in shearing and blanking. Due to environment, health and cost reasons, the absence of lubricants is an aim for future production as it has initiated for machining in the last years. For lubricant-free shearing, it has to be known if there is an influence on the process itself when using oil or not. To find this out, experiments are carried out with a small testing device installed in a tensile testing machine and a blanking tool installed in a servo press. With the small de

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Mára, Vladimír, Jan Krčil, Lenka Michalcová, and Elena Čižmárová. "The Failure of Carbon Fiber Reinforced Composite Analyzed by Acoustic Emission." Defect and Diffusion Forum 405 (November 2020): 205–11. http://dx.doi.org/10.4028/www.scientific.net/ddf.405.205.

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This paper focus on evaluation of behavior, damage and failure processes occurring during the loading cycles in the carbon fiber reinforced composite by acoustic emission method. Since acoustic emission is physical phenomenon that detects the released energy in form of waves spreading through the material due to stimulation of material by external or internal stress, it is possible to evaluate complex damage and failure processes. For that purpose, the standard and open holes tensile testing specimens with different number of plies were manufactured. Selected acoustic emission parameters were

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23

DorMohammdi, Saber, Cody Godines, Frank Abdi, Dade Huang, Massimiliano Repupilli, and Levon Minnetyan. "Damage-tolerant composite design principles for aircraft components under fatigue service loading using multi-scale progressive failure analysis." Journal of Composite Materials 51, no. 15 (2017): 2181–202. http://dx.doi.org/10.1177/0021998317691812.

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Virtual testing has lately gained widespread acceptance among scientists as a simple, accurate, and reproducible method to determine the mechanical properties of heterogeneous microstructures, early in the production process. As a result of the rapid expansion of the use of composites in aerospace design, virtual testing techniques are, in fact, deemed extremely useful to eliminate unnecessary tests and to reduce cost and time associated with generating allowables for lengthy lifing analyses of structures. Leveraging on a limited set of experimental data, a Progressive Failure Analysis can acc

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de Morais, Alfredo Balacó. "Open-hole tensile strength of quasi-isotropic laminates." Composites Science and Technology 60, no. 10 (2000): 1997–2004. http://dx.doi.org/10.1016/s0266-3538(00)00089-0.

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Kameo, Koji, Joop de Haan, Asami Nakai, and Hiroyuki Hamada. "Open Hole Tensile Behaviors of Knitted Fabric Composites." Journal of Reinforced Plastics and Composites 18, no. 17 (1999): 1605–17. http://dx.doi.org/10.1177/073168449901801705.

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Achard, Victor, Christophe Bouvet, Bruno Castanié, and Clément Chirol. "Discrete ply modelling of open hole tensile tests." Composite Structures 113 (July 2014): 369–81. http://dx.doi.org/10.1016/j.compstruct.2014.03.031.

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Xu, Liang, Yi He, Yaoxiong Jia, Shaohua Ma, and Li Hui. "Effects of thermal–oxidative aging on the mechanical properties of open-hole T800 carbon fiber/high-temperature epoxy composites." High Performance Polymers 32, no. 5 (2019): 494–505. http://dx.doi.org/10.1177/0954008319883691.

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T800 carbon fiber/high-temperature epoxy resin composites with holes were subjected to thermal–oxidative aging, and the effects of different aging temperatures and times on the composite properties were investigated. The mass loss, surface topography, open-hole tensile performance, fracture morphologies, dynamic mechanical properties, and infrared spectra were analyzed. The results showed that chemical aging did not occur with thermal–oxidative aging at 70°C and 130°C. However, chemical aging occurred at 190°C. At 70°C, 130°C, and 190°C, all samples showed a slight increase followed by a sligh

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Zhu, Yingdan, Shijie Qi, Hongli Jia, et al. "Assessing tensile behavior of open-hole variable angle tow composites using a general gradient property simulation methodology." Journal of Reinforced Plastics and Composites 39, no. 19-20 (2020): 742–57. http://dx.doi.org/10.1177/0731684420929094.

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Variable Angle Tow placement is a way to steer individual curvilinear fibers. This work presents the assessment of tensile behavior of open-hole composite laminates with Variable Angle Tow reinforcement. A new multi-scale finite element method, consisting of a microscale unit cell model and a macroscale gradient property model, is developed to simulate Variable Angle Tow structures with various fiber trajectories. The tensile strength and the failure process of open-hole reinforced laminates with Variable Angle Tow reinforcement under tensile loading are predicted and analyzed. Experiments are

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Kwame, J. S., E. Yakushina, and P. Blackwell. "Examining Failure Behaviour of Commercially Pure Titanium During Tensile Deformation and Hole Expansion Test." Journal of Materials and Applications 9, no. 1 (2020): 32–37. http://dx.doi.org/10.32732/jma.2020.9.1.32.

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Hole expansion ratio is a material parameter which defines the extent to which sheet metals are formed. Research has shown that, the stress state observed at the hole edge after hole expansion test is similar to those observed during conventional uniaxial tensile test. However, conventional tensile test methods are not efficient in evaluating material edge formability. This work utilised optical non-contact measuring techniques to examine failure behaviour during tensile test and hole expansion test of commercially pure titanium sheet, fabricated with either abrasive water jet cutting or elect

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Krajangsawasdi, Narongkorn, Ian Hamerton, Benjamin K. S. Woods, Dmitry S. Ivanov, and Marco L. Longana. "Open Hole Tension of 3D Printed Aligned Discontinuous Composites." Materials 15, no. 23 (2022): 8698. http://dx.doi.org/10.3390/ma15238698.

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This paper explores the use of Discontinuous Aligned Fibre Filament (DcAFF), a novel discontinuous fibre reinforced thermoplastic filament for 3D printing, to produce structural complex parts. Compared to conventional composite manufacturing, 3D printing has great potential in steering fibres around small structural features. In this current study, the initial thin carbon fibre (CF)-poly(L-lactic acid) (PLA) tape, produced with the High Performance Discontinuous Fibre (HiPerDiF) technology, is now reshaped into a circular cross-section filament, the DcAFF, using a bespoke machine designed to b

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Zhao, Quan Min, Jian Chun Fan, De Yan, Rui Rui Tian, Bo Zhou, and Chun Li. "Development of Downhole Tools for Stratified Testing in Oil and Gas Open-Hole Wells." Advanced Materials Research 422 (December 2011): 614–18. http://dx.doi.org/10.4028/www.scientific.net/amr.422.614.

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In view of the problems that multilayer stratified sampling and acidification-testing operations cannot be done in drill stem multilayer testing for open-hole wells, downhole tools for acidizing and testing were developed, stratified testing and sampling string, acidizing-testing string and their construction technology in open-hole wells were also studied. A set of technologies and equipment were provided for open-hole testing in exploratory wells. Field application shows the studying of drill stem stratified testing technology and related technological equipment can solve the problems existi

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Xu, Liang, Guiting Wang, Song Zhou, and Yanqing Huang. "Study on the effect of hygrothermal aging on the properties of three-dimensional woven composite materials with damage." Advances in Engineering Technology Research 6, no. 1 (2023): 365. http://dx.doi.org/10.56028/aetr.6.1.365.2023.

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This study analyzed the hygroscopic characteristics and mechanical properties of three-dimensional woven composite materials under 70℃/85%RH conditions and with the presence of damage. First, the materials underwent hygrothermal aging tests, including analysis of mass change, moisture absorption rate, SEM microstructure, Fourier-transform infrared spectroscopy (FT-IR), dynamic mechanical analysis (DMA), and subsequent open-hole tensile and compression strength tests under different environmental conditions. Finally, macroscopic failure analysis was conducted. The results showed that as the hyg

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LIANG, SHUANGQIANG, QIHONG ZHOU, and GE CHEN. "Open hole size effects on tensile properties of 3D braided composites." Industria Textila 72, no. 05 (2021): 545–51. http://dx.doi.org/10.35530/it.072.05.202010.

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Owing to the excellent integrated structure, notch-insensitivity, delamination-free characteristics, 3D braided composites have a broad range of engineering applications. In this paper, the notch size effects on two types of 3D braided composites were experimentally examined. Style I incorporated 40% of longitudinal lay-in yarns. Style II was the pure braids. The Point Stress Criterion (PSC) was applied to predict the open-hole strength of 3D braided composites. It is found the 3D braided composites can keep higher proportion residual strength after involving the different circular hole sizes

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Yunus, S., Z. Salleh, N. R. N. M. Masdek, Y. M. Taib, I. I. S. Azhar, and K. M. Hyie. "Post-Impact and Open Hole Tensile Of Kenaf Hybrid Composites." IOP Conference Series: Materials Science and Engineering 328 (March 2018): 012017. http://dx.doi.org/10.1088/1757-899x/328/1/012017.

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Bao, Hongchen, and Guangyan Liu. "Progressive failure analysis on scaled open-hole tensile composite laminates." Composite Structures 150 (August 2016): 173–80. http://dx.doi.org/10.1016/j.compstruct.2016.05.017.

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Kang, Huairong, Pengfei He, Cunman Zhang, et al. "Tensile progressive damage and compressive postbuckling analysis of open-hole laminate composites." Journal of Reinforced Plastics and Composites 39, no. 17-18 (2020): 637–53. http://dx.doi.org/10.1177/0731684420920355.

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Laminate composites contain holes as a means of connection in industrial applications. A better understanding of the mechanical properties of open-hole components is necessary. Herein, progressive damage postbuckling analysis models are proposed for investigation of tensile damage and compressive buckling behaviors of open-hole laminate composites. The progressive damage model is based on failure criteria provided by the continuum damage mechanics model; virtual crack closure technology was employed to calculate the energy release rate for crack delamination in compressive postbuckling analysi

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Ghasemi, Ahmad Reza, Ali Tabatabaeian, and Mehdi Moradi. "A new insight into impact of thermal cycling on the un-notched and circular hole polymeric composite rings via naval ordnance laboratory-ring test." Journal of Composite Materials 54, no. 23 (2020): 3287–95. http://dx.doi.org/10.1177/0021998320912836.

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In this paper, different mechanical responses of polymer matrix composite rings under thermal cycling are analyzed. The polymer matrix composite rings are classified to un-notched and open-hole specimens and tested based on the naval ordnance laboratory-ring tensile test method. Internal pressure, fracture and surface degradation changes as a function of the hole diameter and number of cycles are investigated. Experimental results suggest that specimens with larger hole radius have more mechanical property variations during thermal cycling. Also, it is revealed that the mechanical properties o

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Hisker, Frank, Richard Thiessen, and Thomas Heller. "Influence of Microstructure on Damage in Advanced High Strength Steels." Materials Science Forum 706-709 (January 2012): 925–30. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.925.

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AHSS (Advanced High Strength Steels) combine high strength and good ductility. Their outstanding forming and work-hardening behavior predestines these steels for fabrication of strength relevant structural elements and automobile body parts. To characterize a material, not only tensile, but also hole-expansion and bending behavior are important and help predict the stretch-flange-formability. In this study, detailed analyses of the correlation between these three tests and the damage mechanisms during forming have been performed for selected steels. The results show that for AHSS one should di

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Zhou, Song, Yi Sun, Boyang Chen, and Tong-Earn Tay. "Material orthotropy effects on progressive damage analysis of open-hole composite laminates under tension." Journal of Reinforced Plastics and Composites 36, no. 20 (2017): 1473–86. http://dx.doi.org/10.1177/0731684417710329.

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The sizes effects on the strengths of open-hole fibre-reinforced composite laminates subjected to tensile loading (OHT) have been investigated widely. However, little attention has been paid to the influence of material orthotropy. This paper presents a progressive damage model for the model failure of notched laminates under tensile loading based on continuum damage mechanics and cohesive elements. The effects of orthotropy on the failure of notched laminates with seven different ply sequences are investigated by our proposed model. The prediction results adopting the Hoffman and Pinho failur

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Plosila, P., V. Kesti, A. Kaijalainen, R. Vierelä, P. Rautio, and J. Kömi. "Strain evolution during hole expansion testing of 800 MPa tensile strength hot-rolled steels." IOP Conference Series: Materials Science and Engineering 1284, no. 1 (2023): 012022. http://dx.doi.org/10.1088/1757-899x/1284/1/012022.

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Abstract One limitation of the standardized ISO 16630 hole expansion test is that it provides only one result: limiting hole expansion ratio (HER). In practice, steels with similar HER values can have different cut edge forming behavior due to possible differences in strain localization tendencies. Digital image correlation (DIC) strain measurement during formability testing allows more in-detail analysis of strain-state near the cut edge. In this paper, strain evolution during hole expansion testing was investigated for three 800 MPa tensile strength grade hot-rolled strip steels. The steels

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Chen, B. Y., T. E. Tay, P. M. Baiz, and S. T. Pinho. "Numerical analysis of size effects on open-hole tensile composite laminates." Composites Part A: Applied Science and Manufacturing 47 (April 2013): 52–62. http://dx.doi.org/10.1016/j.compositesa.2012.12.001.

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Yu, Jiajia, Zhongxiang Pan, Qimao Cai, Fa Zhang, and Zhenyu Wu. "Open hole tensile behavior of plain woven carbon/glass hybrid composites." International Journal of Mechanical Sciences 246 (May 2023): 108142. http://dx.doi.org/10.1016/j.ijmecsci.2023.108142.

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Bale, Jefri, Kristomus Boimau, and Marselinus Nenobesi. "Natural Composite Reinforced by Lontar (Borassus flabellifer) Fiber: An Experimental Study on Open-Hole Tensile Strength." International Journal of Biomaterials 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/7685047.

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A research has been conducted in the present study to investigate the effect of hole configuration on tensile strength of lontar fiber-reinforced composites. The lontar fiber-reinforced composites used in this study were produced by hand lay-up process. The lontar fiber-reinforced composites consist of short random fiber of 5 cm that contains 32% of nominal fiber volume as the reinforcement and unsaturated polyester as the matrix. The results show that the differences of hole configuration have an effect on tensile strength of lontar fiber-reinforced composites. It is found that the specific a

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Sirmour, S., U. Kumar, H. Chandrakar, and N. Gupta. "Open Hole Testing Methods for Different Materials: A Review." IOP Conference Series: Materials Science and Engineering 561 (November 12, 2019): 012037. http://dx.doi.org/10.1088/1757-899x/561/1/012037.

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Kalyanasundaram, Dinesh, Suhasini Gururaja, Prajakta Prabhune, and Dilpreet Singh. "Open hole fatigue testing of laser machined MD-CFRPs." Composites Part A: Applied Science and Manufacturing 111 (August 2018): 33–41. http://dx.doi.org/10.1016/j.compositesa.2018.05.005.

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Cao, Zi Zhen, Ji Feng Zhang, Yun Wan, and Yong Gang Xie. "A Damage Model for Prediction of the Open-Hole Strength of Glare Laminates." Applied Mechanics and Materials 325-326 (June 2013): 123–27. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.123.

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A three-dimensional progressive damage model is proposed to predict the open-hole tensile strength of Glare laminates. For the glass fiber reinforced epoxy the user subroutine UMAT is employed for description of the failure modes, such as matrix cracking and fiber failure. Behavior of the delamination between plies of the laminate is described using cohesive elements. Laminates with a rhombic hole, a square hole and a circular hole are taken into consideration separately. The results obtained by the present solution approach are validated with those available in the literatures.

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Wang, Xiao Qiang, Wei Tao Zhao, Bo Fang, Shao Wei Lu, and Ye Wei Zhang. "Finite Element Analysis of the Tensile Properties of Composite Laminates with Open Holes." Advanced Materials Research 1004-1005 (August 2014): 451–54. http://dx.doi.org/10.4028/www.scientific.net/amr.1004-1005.451.

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For different technical reasons, cutouts such as holes in thin-walled structures are inevitable and are of significant technical relevance. Unfortunately open holes usually lead to an undesired stress concentration at the hole vicinity and a reduced load carrying ability of the structure. Therefore the mechanical properties of fiber-reinforced composite laminates with open holes are studied in the paper. The influences of the size and shape of the holes are investigated. A progressive failure finite element model is developed with software ABAQUS. Different failure modes of the composite lamin

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Wang, Hongxiao, Xiaohui Zhang, and Yugang Duan. "Investigating the Effect of Low-Temperature Drilling Process on the Mechanical Behavior of CFRP." Polymers 14, no. 5 (2022): 1034. http://dx.doi.org/10.3390/polym14051034.

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Previous research has found that lower temperature drilling is helpful to improve the hole quality of carbon fiber reinforced polymer (CFRP). However, the influence of the lower temperature drilling process on the mechanical behavior of composites is yet not fully understood. To examine the influence of the lower temperature drilling process on the mechanical behavior of CFRP, the open hole CFRP specimens used for mechanical tests were obtained with three cases: drilling with −25 °C/uncoated carbide drills/(1000 rpm, 0.02 mm/r), 23 °C/coated carbide drills/(4000 rpm, 0.03 mm/r), and 23 °C/unco

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Goltsev, V. Yu, A. V. Osintsev, A. S. Plotnikov, and V. I. Polskij. "Diametral compression of short cylinders with a central hole as a method for assessing the tear resistance of brittle materials." Industrial laboratory. Diagnostics of materials 89, no. 7 (2023): 45–50. http://dx.doi.org/10.26896/1028-6861-2023-89-7-45-50.

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The possibility of evaluating the tear resistance of brittle materials by diametral compression test of short cylinders (solid and central with a central hole) has been analyzed. The computational analysis was performed by the finite element method using the ANSYS program. It is shown that the stress distribution in a disk with a hole is similar that without a hole but contains disturbances introduced by a stress concentrator in the form of a hole. The normalized values of the maximum first principal stresses for a disk with a hole exceed the values for a disk without a hole by more than 5 tim

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Yuwei, Li, Ai Chi, Liu Yu, and Gao Changlong. "The Breakdown Pressure Calculating Model for Open Hole Completion CBM Well Hydraulic Fracturing." Open Fuels & Energy Science Journal 7, no. 1 (2014): 12–19. http://dx.doi.org/10.2174/1876973x01407010012.

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The open hole completion CBM borehole wall intersects with the weak surface such as cleats and fractures. In the process of hydraulic fracturing, the fractures may origin from coal body or cleats, which makes the rupture mechanism and rupture models of the borehole wall being different from the conventional reservoirs. The previous model for calculating breakdown pressure of open hole completion borehole wall considering tension failure has poor applicability for calculating breakdown pressure. Considering the spatial relationship of the intersection of borehole wall and cleats, analyzing the

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