Impact strength of joints bonded with high-strength pressure-sensitive adhesive |
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| Affiliation: | 1. Graduate School, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 2268503, Japan;2. Precision and Intelligence Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 2268503, Japan;3. Photron Limited, 1-1-8 Fujimi, Chiyoda-ku, Tokyo 1020071, Japan;1. Institute of Science and Innovation in Mechanical and Industrial Engineering (INEGI), Faculty of Engineering, University of Porto, Portugal;2. Department of Mechanical Engineering, Faculty of Engineering, University of Porto, Portugal;1. State Key Laboratory of Automotive Safety and Energy, Department of Automotive Engineering, Tsinghua University, Beijing 100084, P.R. China;2. China Science Lab, General Motors, Shanghai 200120, P.R. China;3. GM Research & Development, 30500 Mound Road, Warren, MI 48090-9055, U.S.A.;4. Department of Mechanical Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, P.R. China;1. Mechanical Engineering Department, University of Turkish Aeronautical Association, Turkkusu Campus, Etimesgut, 06790 Ankara, Turkey;2. Department of Mechanical Engineering, University of Bristol, Queen?s Building, University Walk, BS8 1TR Bristol, UK;3. Department of Engineering Science, University of Oxford, Parks Road, Oxford, UK;1. Laboratory of Adhesion and Bio-Composites, Program in Environmental Materials Science, Seoul National University, Seoul 08826, Republic of Korea;2. Research Institute of Agriculture and Life Sciences, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea;3. Samsung Display Co., Ltd., Yongin 446-711, Republic of Korea;1. Graduate School, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan;2. Precision and Intelligence Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan;3. Automobile R&D Center, Honda R&D Co., Ltd., 4630 Shimotakanezawa, Haga-machi, Haga-gun, Tochigi 321-3393, Japan |
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| Abstract: | The impact strength of joints bonded with a double-coated high-strength pressure-sensitive adhesive (PSA) was experimentally investigated. PSA has recently been used to join parts of mobile devices such as smart-phones, which are often subjected to drop impacts. Consequently, the impact strength of PSA bonded joints has become important.Two types of specimens, butt joint specimens and double cantilever beam (DCB) specimens bonded with adhesives were utilized for the experiments. Quasi-static tests and impact tests of the specimens were carried out using a mechanical testing machine and an impact testing machine. The PSA layers in the specimens were observed using a high-speed digital camera. The deformation and strain distribution in the adherends of the DCB specimens were also measured using a novel high-speed digital camera with photoelastic imaging capability.Though the strength of the butt joints increased as the loading rate increased, the critical fracture energy of the DCB specimens decreased at high loading rates. This may be attributed to the transition to the brittle nature of the PSA in the loading range in which no cavitation occurred. To verify the critical fracture energy obtained with the DCB tests, finite element analyses (FEA) based on the cohesive zone model (CZM) were carried out, and the load–displacement curves of the DCB tests were simulated. The predicted results showed good agreements with the experimental results. |
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| Keywords: | Pressure-sensitive Plastics Fracture toughness Impact Double cantilever beam |
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