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Artykuły w czasopismach na temat „Essai Double Cantilever Beam (DCB)”

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Data publikacji: 11 stycznia 2025

Data aktualizacji: 31 lipca 2025

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1

Alfred Franklin, V., T. Christopher, and B. Nageswara Rao. "Influence of Root Rotation on Delamination Fracture Toughness of Composites." International Journal of Aerospace Engineering 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/829698.

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Large deviations have been observed while analysing composite double cantilever beam (DCB) specimens assuming each cracked half as a simple cantilever beam. This paper examines the effect of rotational spring stiffness(K)on the critical fracture energy(GIC)considering nonzero slope at the crack-tip of the DCB specimen by modelling each cracked half as the spring-hinged cantilever beam. The critical load estimates of DCB specimens fromGICare found to be in good agreement with in-house and existing test results of different composite material systems.

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2

Chen, T., C. M. Harvey, S. Wang, and V. V. Silberschmidt. "Analytical corrections for double-cantilever beam tests." International Journal of Fracture 229, no. 2 (2021): 269–76. http://dx.doi.org/10.1007/s10704-021-00556-5.

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AbstractDouble-cantilever beams (DCBs) are widely used to study mode-I fracture behavior and to measure mode-I fracture toughness under quasi-static loads. Recently, the authors have developed analytical solutions for DCBs under dynamic loads with consideration of structural vibration and wave propagation. There are two methods of beam-theory-based data reduction to determine the energy release rate: (i) using an effective built-in boundary condition at the crack tip, and (ii) employing an elastic foundation to model the uncracked interface of the DCB. In this letter, analytical corrections fo

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3

Sponseller, David L., and Thomas E. Sponseller. "The Double Cantilever Beam (DCB) Test at Forty." BHM Berg- und Hüttenmännische Monatshefte 161, no. 1 (2016): 19–26. http://dx.doi.org/10.1007/s00501-016-0449-7.

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4

Colonel, L., A. Calvez, F. Fournel, et al. "Double cantilever beam bonding energy measurement using confocal IR microscopy." Journal of Applied Physics 132, no. 21 (2022): 215106. http://dx.doi.org/10.1063/5.0114668.

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A new technique is assessed in order to measure, at the wafer scale, direct bonding energies. It is derived from the standard Double Cantilever Beam (DCB) method and uses interferometry in confocal IR laser source microscopy to measure crack openings. Such a bonding energy measurement protocol has better accuracy compared to other techniques. This is due to a better confocal microscopy resolution and the high intensity of the laser source. The elastic energy stored in bent wafers is obtained by measuring the beam curvature. DCB deformation models are discussed from the short-range crack openin

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5

Budzik, Michal K., and Henrik M. Jensen. "Evaluation of Defects in Adhesive Joint by Double Cantilever Beam Experiment." Key Engineering Materials 665 (September 2015): 101–4. http://dx.doi.org/10.4028/www.scientific.net/kem.665.101.

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We analyzed effects of interface/adhesive defects during fracture mechanical Mode I Double Cantilever Beam (DCB) tests of an adhesive joint. Two aluminium slabs were bonded using structural epoxy adhesive. A DCB experiment under static loading was conducted to estimate the critical fracture energy. During the ‘steady-state’ fracture we noted oscillating, random fluctuation in the force vs. displacement curve, and thus in the fracture energy. This is associated to the local variation of properties within the bondline and the interfaces. A simple model is derived to quantify the probable density

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6

Wang, K. F., Y. Q. Wang, B. L. Wang, and L. Zheng. "A double cantilever beam incorporating cohesive crack modeling for superconductors." Modern Physics Letters B 34, no. 15 (2020): 2050166. http://dx.doi.org/10.1142/s0217984920501663.

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In this paper, a double cantilever beam (DCB) specimen incorporating cohesive crack is developed for superconductors which have potential applications in high temperature superconducting cables in space solar power station. The cohesive interface is introduced along the crack front of the DCB model under electromagnetic force. The load-separation relation (i.e. the crack opening displacement) is used as the fracture mechanics parameter and the corresponding curves during fracture process are obtained and verified by the finite element numerical method. Results show that the presence of tensile

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7

Li, Rongzhi, Lin Ye, and Yiu-Wing Mai. "Interlaminar Fracture of Stitched GFRP Laminates." Advanced Composites Letters 5, no. 1 (1996): 096369359600500. http://dx.doi.org/10.1177/096369359600500101.

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The mode I interlaminar fracture of Kevlar thread stitched GFRP laminates has been studied using double-cantilever-beam (DCB) tests. It was found that stitching density and patterns influence interlaminar fracture performance of composites mainly through the different failure mechanisms of stitch threads during crack propagation.

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8

Dahlan, Hendery, Meifal Rusli, Mulyadi Bur, and Rika Ampuh Hadiguna. "Kaji Teoritis Pengaruh Variasi Letak Retak Terhadap Perambatan Retak Dengan Pendekatan Double Cantilever Beam (DCB)." Jurnal Inovasi Rekayasa Mekanikal dan Termal 1, no. 2 (2023): 20–26. http://dx.doi.org/10.25077/inomet.1.2.20-26.2023.

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One of the causes of structural failure is the presence of defects in the form of cracks that appear during the manufacturing or usage process of the structure. The propagation of cracks in the structure greatly depends on the value of the energy released rate possessed by the defective structure. Therefore, it is necessary to calculate the energy released rate of a structure that has a crack. One simple approach is the double cantilever beam (DCB) method. The DCB approach is derived from the change in strain energy with respect to the change in crack length. In this study, variations in crack

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9

Gourlie, A. D., G. N. Podolski, and J. R. Fleet. "A Detailed Statistical Examination of the Double Cantilever Beam (DCB) Test." CORROSION 47, no. 9 (1991): 728–35. http://dx.doi.org/10.5006/1.3585859.

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10

Christopoulos, G. C., and S. A. Paipetis. "Interlaminar Fatigue Crack Propagation in Mode I of Carbon Fiber/PEEK Composites." Advanced Composites Letters 2, no. 1 (1993): 096369359300200. http://dx.doi.org/10.1177/096369359300200101.

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A study of the mode I interlaminar fracture toughness of a unidirectional carbon fibre reinforced thermoplastic matrix composite has been made using Double Cantilever Beam, DCB, specimens. Delamination growth per fatigue cycle, da/dN, was related with the maximum applied cyclic strain energy release rate, GIMAX, using a power law.

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11

Balendran, B. "On the Double Cantilever Beam Specimen for Mode-I Interface Delamination." Journal of Applied Mechanics 61, no. 2 (1994): 471–73. http://dx.doi.org/10.1115/1.2901470.

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A compliance model is presented for a DCB specimen for mode-I interface delamination. The undelaminated part of the specimen is modeled by using Reissner’s mixed variational principle from which the rotation of the cross-section at the tip of the crack and the shear stress at the interface are evaluated. The results for a homogeneous beam with midplane crack are deduced and shown to be in better agreement with the experimental and finite element results than any of the existing models.

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12

Tawk, I., J. F. Ferrero, J. J. Barrau, E. Abdullah, and M. Sudre. "Amultilayered Solid Element used to Model Composite Delamination." Advanced Composites Letters 19, no. 1 (2010): 096369351001900. http://dx.doi.org/10.1177/096369351001900103.

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This paper focuses on the latest development of a solid hexahedron element for composite delamination analysis. The 8-node solid is derived from a 20-node hexahedron. It is transformed into two physical independent 4-node shell elements according to the propagation of delamination process within the element. This transformation is driven by a transfer and damage laws that are defined by calibrating the element with a FE modeling for a double cantilever beam (DCB) test. According to the position of the crack in the element, one parameter defines the degradation of the transverse properties at t

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13

LOO, SHANE ZHI YUAN, PUAY CHENG LEE, ZAN XUAN LIM, et al. "INTERFACE FRACTURE TOUGHNESS ASSESSMENT OF SOLDER JOINTS USING DOUBLE CANTILEVER BEAM TEST." International Journal of Modern Physics B 24, no. 01n02 (2010): 164–74. http://dx.doi.org/10.1142/s0217979210064095.

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In the current work, a test scheme to evaluate solder joint interface fracture toughness using double cantilever beam (DCB) test has been successfully demonstrated. The obtained results, in terms of critical energy release rate, predict the joint failure based on the principle of fracture mechanics. The results can be used as a materials property in the reliability design of various types of solder-ball joined packages. DCB specimens made of 99.9 wt% copper were selected in the current work. Eutectic Sn -37 Pb and lead-free Sn -3.5 Ag -0.5 Cu solders were used to join two pieces of the copper

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14

Pavelko, Vitalijs. "Application of the Nonlinear Model of a Beam for Investigation of Interlaminar Fracture Toughness of Layered Composite." Key Engineering Materials 665 (September 2015): 273–76. http://dx.doi.org/10.4028/www.scientific.net/kem.665.273.

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Earlier presented the geometrically nonlinear model of a flexible beam (cylindrical bending of a plate) was used for analysis of post-buckling behavior of the layered composite with delamination at compression. In this paper the model is used for more details nonlinear analysis of double cantilever beam (DCB) that used in standard test for determination of the interlaminar fracture toughness composites with delamination-type damage. The main advantage of the model is a precise description of the curved axis of the beam (plate) without linearization or other higher order approximations. The exa

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15

Hlača, Ivan, Marin Grbac, and Leo Škec. "Determining Fracture Resistance of Structural Adhesives in Mode-I Debonding Using Double Cantilever Beam Test." Zbornik radova 22, no. 1 (2019): 59–74. http://dx.doi.org/10.32762/zr.22.1.4.

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Double cantilever beam (DCB) test is the most commonly used test for determining the fracture resistance of structural adhesive joints in mode-I debonding. Test specimens are composed of two equal plates that are glued together, and then exposed to the opening load causing crack propagation along the bonded surface. During the experiment, loadline displacement, applied force and crack length are measured continuously. Using these data, the fracture toughness of the adhesive can be computed by the procedure given in the relevant ISO standard (BS ISO 25217:2009). The calculations are based on si

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16

Mohamed Ben Ali, Amina, Salah Bouziane, and Hamoudi Bouzerd. "Computation of mode I strain energy release rate of symmetrical and asymmetrical sandwich structures using mixed finite element." Frattura ed Integrità Strutturale 15, no. 56 (2021): 229–39. http://dx.doi.org/10.3221/igf-esis.56.19.

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The use of composite materials is on the rise in different engineering fields, the main advantage of these materials for the aerospace industry is their low weight for excellent mechanical qualities. The analysis of failure modes, such as delamination, of these materials has received great attention from researchers. This paper proposes a method to evaluate the mode I Strain Energy Release Rate (SERR) of sandwich structures. This method associated a two-dimensional mixed finite element with virtual crack extension technique for the analysis of interfacial delamination of sandwich beams. A symm

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17

Li, Yuan, Naoki Hori, Masahiro Arai, Hisao Fukunaga, and Ning Hu. "Investigation on Interlaminar Mechanical Properties of Hybrid CFRP/VGCF Laminates." Advanced Materials Research 79-82 (August 2009): 1759–62. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1759.

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In order to improve the interlaminar mechanical properties of CFRP laminate, hybrid CFRP/VGCF laminates have been fabricated by newly-developed powder method. The critical load at crack growth Pc and fracture toughness GIC have been found to be increased with VGCF interlayer through double cantilever beam (DCB) tests. Fracture surfaces of DCB specimens have also been observed to interpret this improvement mechanism. Moreover, numerical simulations using finite element method (FEM) with cohesive elements have been carried out to analyze the delamination propagation. The numerically obtained int

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18

de Morais, A. B. "A new fibre bridging based analysis of the Double Cantilever Beam (DCB) test." Composites Part A: Applied Science and Manufacturing 42, no. 10 (2011): 1361–68. http://dx.doi.org/10.1016/j.compositesa.2011.05.019.

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Gliszczynski, A., S. Samborski, N. Wiacek, and J. Rzeczkowski. "Mode I Interlaminar Fracture of Glass/Epoxy Unidirectional Laminates. Part II: Numerical Analysis." Materials 12, no. 10 (2019): 1604. http://dx.doi.org/10.3390/ma12101604.

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The paper deals with numerical analysis of double cantilever beam (DCB) predefined to Mode I Interlaminar Fracture Tests of GRFP unidirectional laminates. The numerical analyses were performed in the ANSYS® program based on the finite element. In geometrically nonlinear analysis, two algorithms, responsible for initiation and propagation of delamination front, were applied: Virtual Crack Closure Technique (VCCT) and Cohesive zone method (CZM). Due to the unidirectional arrangement of layers of the laminate, the problem of DCB test was solved with the use of one- and three-dimensional models wi

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20

Aalami, MR, and TN Chakherlou. "Investigating the effects of loading system on the fracture behavior of DCB specimens considering T-stress." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 235, no. 12 (2021): 2654–65. http://dx.doi.org/10.1177/14644207211030963.

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Double cantilever beam specimen is a standard specimen for assessment of mode I failure and separation in adhesively bonded joints and also composite materials. Among the several load introduction systems, the piano hinges and end loading blocks are more common. It has been accepted that the fracture toughness results of the two cases are different, but the effect of the loading system on the load-displacement data and fracture mechanisms is not entirely known yet. Therefore, in this study, the two loading concepts are compared both by precise finite element simulations and experimental tests.

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21

Aalami, MR, and TN Chakherlou. "Investigating the effects of loading system on the fracture behavior of DCB specimens considering T-stress." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 235, no. 12 (2021): 2654–65. http://dx.doi.org/10.1177/14644207211030963.

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Double cantilever beam specimen is a standard specimen for assessment of mode I failure and separation in adhesively bonded joints and also composite materials. Among the several load introduction systems, the piano hinges and end loading blocks are more common. It has been accepted that the fracture toughness results of the two cases are different, but the effect of the loading system on the load-displacement data and fracture mechanisms is not entirely known yet. Therefore, in this study, the two loading concepts are compared both by precise finite element simulations and experimental tests.

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22

Ramadas, Chennamsetti, Avinash Hood, Krishnan Balasubramaniam, and Makarand Joshi. "Ultrasonic Lamb Wave Based Crack Growth Prediction for Estimation of Strain Energy Release Rate." Advanced Materials Research 585 (November 2012): 24–28. http://dx.doi.org/10.4028/www.scientific.net/amr.585.24.

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A technique is proposed to predict crack growth for the estimation of Strain Energy Release Rate (SERR) of Double Cantilever Beam (DCB) bi-metallic specimen, employing ultrasonic Lamb waves. Techniques based on the Time-of-Flight (ToF) of the Turning Lamb Mode (TLM) and Direct Lamb Mode (DLM) explored to determine the crack growth. Sensitivity analysis revealed that the Lamb mode with low velocity is more sensitive to crack growth than that of the high velocity Lamb mode.

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Wang, Guijun, Yanqing Wu, Yuxiang Wang, Fenglei Huang, and Tao Wang. "Experimental study of propellant/liner interface fracture characteristics." Journal of Physics: Conference Series 2891, no. 2 (2024): 022010. https://doi.org/10.1088/1742-6596/2891/2/022010.

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Abstract The propellant/liner interface debonding is one of the main failure modes affecting the structural integrity of solid rocket motors. In order to study the mechanical properties of the propellant/liner interface, the Double-Cantilever Beam (DCB) specimen of the propellant/liner interface was improved. Based on the propellant/liner interface DCB specimens, tensile tests at different temperatures and loading rates were carried out. Based on the digital image correlation(DIC) method, the strain field of the whole DCB specimen and the propellant part was analyzed respectively. Meanwhile, t

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24

Jiang, Xiao-Wei, Shijun Guo, Hao Li, and Hai Wang. "Peridynamic Modeling of Mode-I Delamination Growth in Double Cantilever Composite Beam Test: A Two-Dimensional Modeling Using Revised Energy-Based Failure Criteria." Applied Sciences 9, no. 4 (2019): 656. http://dx.doi.org/10.3390/app9040656.

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This study presents a two-dimensional ordinary state-based peridynamic (OSB PD) modeling of mode-I delamination growth in a double cantilever composite beam (DCB) test using revised energy-based failure criteria. The two-dimensional OSB PD composite model for DCB modeling is obtained by reformulating the previous OSB PD lamina model in x–z direction. The revised energy-based failure criteria are derived following the approach of establishing the relationship between critical bond breakage work and energy release rate. Loading increment convergence analysis and grid spacing influence study are

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Nakamura, Kota, Yu Sekiguchi, Kazumasa Shimamoto, Keiji Houjou, Haruhisa Akiyama, and Chiaki Sato. "Creep Crack Growth Behavior during Hot Water Immersion of an Epoxy Adhesive Using a Spring-Loaded Double Cantilever Beam Test Method." Materials 16, no. 2 (2023): 607. http://dx.doi.org/10.3390/ma16020607.

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Double cantilever beam (DCB) tests were conducted by immersing the specimens in temperature-controlled water while applying a creep load using a spring. By introducing a data reduction scheme to the spring-loaded DCB test method, it was confirmed that only a single parameter measurement was sufficient to calculate the energy release rate (ERR). Aluminum alloy substrates bonded with an epoxy adhesive were used, and DCB tests were performed by changing the initial load values, spring constants, and immersion temperatures for two types of surface treatment. The initial applied load and spring con

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Burlayenko, Vyacheslav N., Tomasz Sadowski, and Daniel Pietras. "Influence of Dynamic Loading on Fracture Behaviour of DCB Sandwich Specimen." ITM Web of Conferences 29 (2019): 02003. http://dx.doi.org/10.1051/itmconf/20192902003.

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Numerical simulations of dynamic fracture behaviour of a double cantilever sandwich beam subjected to uneven bending moments in plane conditions are carried out using the dynamic finite element analyses with the ABAQUSTM code. The strain energy release rate was evaluated by means of the finite element model developed within the two-dimensional (2-D) linear elastodynamic theory. This demonstrates the capability and the reliability of the finite element modelling as an extremely useful numerical tool for solving dynamic fracture mechanics problems. Also, the dynamic behaviour of fracture paramet

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Wan, Li, Wei Qing Liu, and Hai Fang. "Mechanical Behavior of Composite Column Reinforced Paulownia Wood Sandwich." Advanced Materials Research 168-170 (December 2010): 2049–54. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.2049.

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Paulownia wood was drilled with some glass fibers fulfilled in the holes, which could be the core of the sandwich structures. In the manufacture processing, the fibers and resins left in the holes formed composite columns and merged with the facesheets. These could enhance the mechanical behavior of paulownia wood sandwich structures. Double cantilever beam(DCB) tests and bending analysis with finite element method were carried out. The improvement from the composite columns gave little contribution to bending behavior, but significant contribution to interfacial properties.

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Cañas, José, Luis Távara, Antonio Blázquez, and Alejandro Estefani. "Overview of Gc Tests Used to Evaluate Composite–Composite Adhesive Joints." Journal of Multiscale Modelling 10, no. 03 (2019): 1842002. http://dx.doi.org/10.1142/s1756973718420027.

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The quality of composite–composite bonded joints is a very important issue for industries, especially for the aerospace sector. A deficient joint may stop the manufacturing process and its repairing may include very high costs. Nowadays, the quality of the joint is obtained by means of interlaminar fracture toughness tests, estimating the [Formula: see text] value (Energy Release Rate used to produce crack propagation) over coupons with (theoretically) the same conditions as those included in an actual part. Usually, [Formula: see text] is obtained by means of a Double Cantilever Beam (DCB) te

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Shen, Yurong, Dongsheng Huang, Ying Hei Chui, and Chunping Dai. "Fracture of Parallel Strand Bamboo Composite under Mode I Loading: DCB Test Investigation." Advances in Materials Science and Engineering 2019 (September 23, 2019): 1–10. http://dx.doi.org/10.1155/2019/7657234.

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This paper describes the experimental studies on Mode I fracture of parallel strand bamboo (PSB) by the double cantilever beam (DCB) test. R-curves based on the elementary beam theory and specimen compliance are proposed in order to overcome the difficulties to monitor the crack propagation during experiments. The results demonstrate that the energy release rate (ERR) is influenced by the specimen geometry, i.e., the specimen width and initial crack length. The ERR at the plateau level is similar for the range of the analyzed widths (B = 20, 40, and 60 mm), while it decreases with width increa

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Zhao, Hong Ping, Robert Kwok Yiu Li, and Xi Qiao Feng. "Experimental Investigation of Interlaminar Fracture Toughness of CFRP Composites with Different Stitching Patterns." Key Engineering Materials 297-300 (November 2005): 189–94. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.189.

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Through-thickness stitching is one of the most effective techniques to improve the delamination resistance of composite laminates. The effects of two different stitching patterns on the mode-I interlaminar fracture toughness of unidirectional carbon fiber reinforced plastics (CFRP) are examined experimentally in the present paper by using the double cantilever beam (DCB) test method. It is found that the zigzag stitching pattern results in a better toughening effect than the straight line pattern, and that the stitching density also has a considerable influence on the mode-I fracture toughness

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Alfred Franklin, V., and T. Christopher. "Fracture Energy Estimation of DCB Specimens Made of Glass/Epoxy: An Experimental Study." Advances in Materials Science and Engineering 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/412601.

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This paper examines critical load and corresponding displacement of double cantilever beam (DCB) composite specimens made of glass/epoxy of three different layups. Experiments were conducted on these laminates, and the fracture energy,GIc, was evaluated considering the root rotation at the crack tip. The present model requires the applied load-displacement history and crack extension to estimate fracture energy. Reduction schemes based on cubic and power law are also proposed to determine Young’s modulus and energy release rate and found good agreement with the published and test results.

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Yoshihara, Hiroshi, and Kyohei Nobusue. "Mode I and Mode II fracture toughness of densified Sitka spruce fabricated in an airtight atmosphere with high-temperature steam." Holzforschung 62, no. 1 (2008): 82–85. http://dx.doi.org/10.1515/hf.2008.012.

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Abstract Mode I and Mode II initiation fracture toughness was examined by DCB (double cantilever beam) and 3ENF (three-point bend end notched flexure) tests on specimens of compressed Sitka spruce. The compressed wood was fabricated by varying the compression ratio, and the effectiveness of the compression treatment was examined in view of improving the fracture mechanics properties. In both cases, the fracture toughness did not show a significant increase after the compression treatment. Thus, it would be necessary to develop a new compression treatment method to improve the fracture mechanic

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Kim, Y. C., H. K. Choi, and J. U. Cho. "Experimental Study On Fracture Property Of Double Cantilever Beam Specimen With Aluminum Foam." Archives of Metallurgy and Materials 60, no. 2 (2015): 1151–54. http://dx.doi.org/10.1515/amm-2015-0087.

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Abstract This study aims to investigate double cantilever beam specimen with aluminum foam bonded by spray adhesive to investigate the fracture strength of the adhesive joint experimentally. The fracture energy at opening mode is calculated by the formulae of British Engineering Standard (BS 7991) and International Standard (ISO 11343). For the static experiment, four types of specimens with the heights (h) of 25 mm, 30 mm, 35 mm and 40 mm are manufactured and the experimental results are compared with each other. As the height becomes greater, the fracture energy becomes higher. After the len

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Abuobaid, A., D. Heider, and S. Yarlagadda. "A time-domain reflectometry method for automated measurement of crack propagation in composites during mode I DCB testing under cold, hot, and hot/wet conditions." Journal of Thermoplastic Composite Materials 32, no. 4 (2018): 558–73. http://dx.doi.org/10.1177/0892705718772873.

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This article describes an automated method for the measurement of crack initiation and propagation in composite materials during modeI double cantilever beam (DCB) testing under different environmental conditions. The method uses the time-domain reflectometry (TDR)-DCB system, which transmits a high-frequency pulse through a transmission line integrated within the composite test coupon and measures impedance discontinuities generated due to the presence of a crack. Using this system, real-time crack propagation in the specimen can be monitored, and the critical fracture toughness parameters (

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Rajendran, Thamilarasu S., Mahzan Johar, Shukur Abu Hassan, and King Jye Wong. "Mode I and Mode II Delamination of Flax/Epoxy Composite Laminate." MATEC Web of Conferences 202 (2018): 01002. http://dx.doi.org/10.1051/matecconf/201820201002.

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In recent decades, natural fibres are getting their attention as reinforcement in composite materials. This is because natural fibres are environmental friendly. However, delamination is commonly recognised as one of the earliest failures in composite laminates. The objective of the present work is to investigate mode I and mode II delamination behaviour of flax fabrics reinforced epoxy composite. The delamination characterisation was carried out using double cantilever beam (DCB) and three point end notched flexure (ENF) tests. The fracture toughness were calculated using experimental calibra

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Waas, Victor D., Mas Irfan P. Hidayat, and Lukman Noerochim. "Finite Element Simulation of Delamination in Carbon Fiber/Epoxy Laminate Using Cohesive Zone Model: Effect of Meshing Variation." Materials Science Forum 964 (July 2019): 257–62. http://dx.doi.org/10.4028/www.scientific.net/msf.964.257.

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Delamination or interlaminar fracture often occurs in composite laminate due to several factors such as high interlaminar stress, stress concentration, impact stress as well as imperfections in manufacturing processes. In this study, finite element (FE) simulation of mode I delamination in double cantilever beam (DCB) specimen of carbon fiber/epoxy laminate HTA/6376C is investigated using cohesive zone model (CZM). 3D geometry of DCB specimen is developed in ANSYS Mechanical software and 8-node interface elements with bi-linear formulation are employed to connect the upper and lower parts of D

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Skoczylas, Jakub, Sylwester Samborski, and Mariusz Kłonica. "Acoustic emission as a valuable technique used for monitoring polymer failures." Studia Universitatis Babeș-Bolyai Engineering 66, no. 1 (2021): 34–44. http://dx.doi.org/10.24193/subbeng.2021.1.4.

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In the paper, acoustic emission (AE) system was presented as a method that can be used to monitor polymer material failures. Samples fabricated of two aluminum profiles bonded together with a thick layer of cured epoxy resin were subjected to fracture tests. Epidian 53 epoxy resin cured with Z1 curing agent as well as Epidian 5 epoxy resin cured with PAC curing agent were selected as adhesives. Acoustic emission parameters were acquired during Double Cantilever Beam (DCB) tests. The frequencies of elastic waves released during failure were then analyzed using both Fast Fourier Transformation (

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Li, Yan, Yiu Wing Mai, and Lin Ye. "Fracture Properties and Characteristics of Sisal Textile Reinforced Epoxy Composites." Key Engineering Materials 312 (June 2006): 167–72. http://dx.doi.org/10.4028/www.scientific.net/kem.312.167.

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In this paper, double cantilever beam (DCB) and end notch flexural (ENF) tests were performed to study mode I and mode II interlaminar fracture toughness of sisal textile reinforced epoxy composites. Two kinds of fiber surface treatment methods were used to improve the interfacial bonding properties between sisal fiber and the epoxy resin. Effect of fiber surface treatments on mode I and mode II fracture toughness was analyzed with the aid of microobservation and single fiber pull-out test. It was concluded that proper fiber surface treatment could improve the fracture properties of this kind

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Gordić, M. V., I. M. Djordjević, D. R. Sekulić, Z. S. Petrović, and M. M. Stevanović. "Delamination Strain Energy Release Rate in Carbon Fiber/Epoxy Resin Composites." Materials Science Forum 555 (September 2007): 515–19. http://dx.doi.org/10.4028/www.scientific.net/msf.555.515.

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The paper reports on an experimental study of the Mode I interlaminar fracture of unidirectional carbon fibers/epoxy resin composites. Mode I delamination strain energy release rate GIC was determined in double cantilever beam (DCB) test, before and after gamma irradiation at various doses. Glass transition temperature, Tg of epoxy matrix was determined from dynamic mechanical measurements. The delamination surfaces of tested coupons were observed by scanning electron microscopy. The variations in GIC values were correlated with irradiation doses, Tg values and the features of delamination mic

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Nguyen, Dang Du, TaeGyeong Lim, Soomook Lim, and Ji Won Suk. "Interlayer Separation in Graphene Paper Comprising Electrochemically Exfoliated Graphene." Nanomaterials 11, no. 4 (2021): 865. http://dx.doi.org/10.3390/nano11040865.

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The emergence of graphene paper comprising well-stacked graphene flakes has promoted the application of graphene-based materials in diverse fields such as energy storage devices, membrane desalination, and actuators. The fundamental properties of graphene paper such as mechanical, electrical, and thermal properties are critical to the design and fabrication of paper-based devices. In this study, the interlayer interactions in graphene paper were investigated by double cantilever beam (DCB) fracture tests. Graphene papers fabricated by flow-directed stacking of electrochemically exfoliated few-

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Kali, Naresh, and Srikanth Korla. "Numerical Studies on Mode I Delamination and its Effect on the Vibrational Characteristics in Fibre Metal Laminates." IOP Conference Series: Materials Science and Engineering 1225, no. 1 (2022): 012039. http://dx.doi.org/10.1088/1757-899x/1225/1/012039.

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Abstract Fibre metal laminates (FMLs) afford the notable advances over ongoing composite materials for aerospace and automotive applications due to their low weight and outstanding mechanical properties. Nevertheless, FMLs are prone to damages during manufacturing and loading conditions. Double cantilever beam (DCB) and vibration test are the commonly used tools to assess fracture energy values and the level of damage influence on the material properties respectively. Therefore, this paper aims at correlating the numerical validation of mode I delamination with already published experimental d

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Tserpes, Konstantinos. "Numerical evaluation of crack stopping mechanisms in composite bonded joints due to corrugation and bolts." MATEC Web of Conferences 304 (2019): 01003. http://dx.doi.org/10.1051/matecconf/201930401003.

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In this paper, the crack stopping mechanisms in corrugated composite bonded joints and hybrid bonded/bolted joints were evaluated numerically using the cohesive zone modeling approach. For the study, the DCB (double-cantilever beam) and the CLS (crack-lap shear) specimens were modelled. The first two specimens were subjected to static loads and the latter both to static and fatigue loads. The analysis was performed using the LS-DYNA explicit FE code. Fatigue crack growth simulation was performed using an in-house developed user-defined subroutine (UMAT). The numerical results reveal a crack st

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TODOROVIĆ, MARIJA, MATHIEU KOETSIER, NAĐA SIMOVIĆ, IVAN GLIŠOVIĆ, and MARKO PAVLOVIĆ. "DETERMINATION OF MODE I FRACTURE PROPERTIES OF EUROPEAN SPRUCE." Wood Research 68, no. 2 (2023): 334–47. http://dx.doi.org/10.37763/wr.1336-4561/68.2.334347.

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In this paper an efficient procedure for obtaining a cohesive law for Mode I timber fracture (crack opening), based on the Double Cantilever Beam (DCB) tests is given. DCB tests were performed on ten European spruce specimens in order to determine the energy release rate vs crack length (R curves). Two crucial parameters - crack length during the experiment and the crack tip opening displacement were obtained using 2D Digital Image Correlation (DIC) technique. In order to determine accurate fracture resistance (R curve), procedure which includes calculating cumulative released energy was emplo

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Choi, S. R., and J. A. Salem. "Fracture toughness of PMMA as measured with indentation cracks." Journal of Materials Research 8, no. 12 (1993): 3210–17. http://dx.doi.org/10.1557/jmr.1993.3210.

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Fracture toughness of polymethyl methacrylate (PMMA) was evaluated with indentation cracks. The cracks were developed by indenting in a liquid acetone environment, as suggested by previous researchers. Due to the inconsistency in crack configurations with varying indentation loads and to the negligible residual stress from indentation, the application of the indentation strength method was limited in evaluating fracture toughness of PMMA. The semielliptical crack approximation, however, particularly at a low indentation load of 9.8 N, resulted in reasonable agreement with the value determined

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Hoa, S. V., S. Lin, and J. R. Chen. "Hygrothermal Effect on Mode II Interlaminar Fracture Toughness of a Carbon/Polyphenylene Sulfide Laminate." Journal of Reinforced Plastics and Composites 11, no. 1 (1992): 3–31. http://dx.doi.org/10.1177/073168449201100102.

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By using a double cantilever beam (DCB) specimen, the hygrothermal effect on Mode II (in-plane shear loading) interlaminar fracture toughness of a carbon/polyphenylene sulfide (PPS) unidirectional laminate was investigated. The critical strain energy release rates, Gnc, of the carbon/PPS laminate during crack propagation under Mode II loading for various temperature/relative humidity conditions were obtained both by linear beam theory and by the area method. It was found that the critical strain energy release rate of the carbon/PPS laminate increases with both moisture content and temperature

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Bittencourt, Mario, Alireza Akhavan-Safar, Diogo Santos, Sabine Wenig, and Lucas F. M. Da Silva. "Fatigue Threshold Analysis of Adhesives: Displacement Control vs. Load Control Strategy." Journal on Mechanics of Solids 1, no. 1 (2022): 9–14. http://dx.doi.org/10.24840/2975-8262_001-001_001843.

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The aim of this paper is to study the response of a two-part polyurethane-resin adhesive under quasi-static and fatigue loading conditions, to compare load control and displacement control approaches for the mode I fatigue threshold analysis of the tested material. To achieve this, double cantilever beam (DCB) joints were manufactured and tested. For the post-processing of the raw data, a compliance-based beam method was used. Out of this analysis, R curves and Paris law curves were obtained. Both approaches showed a similar Paris law slope meaning a low sensibility of the crack growth rate be

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Terasaki, Nao, Yuki Fujio, Shin Horiuchi, and Haruhisa Akiyama. "Mechanoluminescent studies of failure line on double cantilever beam (DCB) and tapered-DCB (TDCB) test with similar and dissimilar material joints." International Journal of Adhesion and Adhesives 93 (September 2019): 102328. http://dx.doi.org/10.1016/j.ijadhadh.2019.01.022.

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Googarchin, Hamed Saeidi, Mohammad Hassan Shojaeefard, Mohammad Reza Gheibi, and Zohreh Sarvi. "A novel cohesive zone model to simulate ductile adhesives in automotive structure metallic joints." International Journal of Computational Physics Series 1, no. 1 (2018): 301–8. http://dx.doi.org/10.29167/a1i1p301-308.

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In recent years, increasing utilize of the adhesively bonded joints due to its prominent features in distribution of the stress in bonded area and bonding dissimilar material has led to developing its computational aspects to provide more reliable response. In this regard, cohesive zone model (CZM) as an effective method to simulate bondline is introduced. The crucial aspect of this method is the determination of the relation between traction and separation in fracture process zone (FPZ). In fact, the traction-separation law (TSL) is a material model which must be properly obtained and applied

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Xie, Zong Hong, Xiang Li, Jian Zhao, Jie Hao, Yan Peng Sun, and Xiao Dong Sui. "Study on the Mode I Interlaminar Fracture Toughness of Multi-Directional Composite Laminates." Advanced Materials Research 718-720 (July 2013): 186–90. http://dx.doi.org/10.4028/www.scientific.net/amr.718-720.186.

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The double cantilever beam (DCB) test method and the modified beam theory are adopted to investigate the Mode I interlaminar fracture toughness of multi-directional composite laminates. The test procedure was developed by using a stereoscopic microscope to observe the delamination front tip and a testing machine to record the displacement and load data. A dial indicator was used to eliminate the error due to initial clearance in the clamp. A modified beam theory and a compliance calibration method were used to calculate the interlaminar fracture toughness. The Mode I interlaminar fracture toug

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Luo, Ming, Zhong-Hua Zhang, Yao-Heng Liu, and Mou-Cheng Li. "Effect of Titanium and Boron Microalloying on Sulfide Stress Cracking in C110 Casing Steel." Materials 13, no. 24 (2020): 5713. http://dx.doi.org/10.3390/ma13245713.

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The effect of Ti and B microalloying on the hardenability, prior austenite grain size (PAGS), mechanical properties, and sulfide stress cracking (SSC) of C110 grade steel was studied by Jominy testing, static tensile testing, an optical microscope (OM), scanning electron microscopy (SEM) and double cantilever beam (DCB) testing. The results show that the addition of 0.015% Ti and 0.002% B into a medium-carbon Fe-Cr-Mo-Nb-V steel increased the hardenability and refined the PAGS and quenched martensite packets, and the size of carbides was reduced. It is believed that these behaviors are respons

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