Shear testing of thick adhesive layers using the ENF-specimen |
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| Affiliation: | 1. Department of Mechanical Engineering, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan;2. Department of Mechanical Sciences and Engineering, Tokyo Institute of Technology, 2-12-1-I1-58, Ookayama, Meguro, Tokyo 152-8552, Japan;1. Department of Engineering Mechanics, Dalian University of Technology, Dalian, China;2. School of Automotive Engineering, Dalian University of Technology, Dalian, China;3. State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian, China;4. State Grid Puyang Power Supply Company, Puyang, China;1. University of Tras-os-Montes e Alto Douro, CITAB, Department of Engineering, School of Sciences and Technology, 5000-801 Vila Real, Portugal;2. University of Porto, INEGI, Engineering Faculty, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;1. Dept. of Mechanical Eng., Erzurum Technical University, 25050, Erzurum, Turkey;2. Dept. of Mechanical Eng., Erzincan University, 24100, Erzincan, Turkey;1. Teachers College for Vocational and Technical Education, Guangxi Normal University, Guilin, 541004, PR China;2. School of Computer Science & Information Engineering, Shanghai Institute of Technology, Shanghai, 2014184, PR China;3. Guangxi Automobile Group Co., Ltd., Liuzhou, 545007, PR China;4. State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun, 130021, PR China;5. CRRC TANGSHAN CO., LTD., Tangshan, 063035, PR China |
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| Abstract: | An existing experimental method to determine cohesive laws for adhesive layers loaded in shear is further developed. The method is based on differentiation of the energy release rate (ERR) with respect to the adhesive shear deformation at the crack tip. The test geometry used is an ENF-specimen for which the adherends are assumed to deform linearly elastic. The original method is expanded to account for situations where the thickness of the adhesive layer is not negligible as compared to the adherend thickness. To this end, a novel mathematical expression for the energy release rate (ERR) is derived. No assumptions on the form of the cohesive law are made; it is implicitly included in the derivation. The expression for the ERR contains the applied load and the shear deformation of the adhesive layer at the initial position of the crack tip, in addition to geometrical properties and the elastic modulus of the adherend material. Numerical simulations are performed to verify the accuracy of the mathematical expression for the ERR. Preliminary results from experiments performed on an epoxy adhesive are presented. The cohesive law of the adhesive layer is extracted by using a blunted crack tip. Verifying simulations confirm that the local pre-fracture behavior is accurately captured. |
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| Keywords: | A Epoxides B Metals C Fracture D Cohesive zone model |
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