Determination of the impact tensile strength of structural adhesive butt joints with a modified split Hopkinson pressure bar |
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| Affiliation: | 1. Technische Universität Braunschweig, Institute of Joining and Welding, Langer Kamp 8, 38106 Braunschweig, Germany;2. Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany;1. Fraunhofer Institute for High-Speed Dynamics, Ernst-Mach-Institute, EMI, Eckerstraße 4, 79104 Freiburg, Germany;2. Fraunhofer Institute for Manufacturing Technology and Advanced Materials, IFAM, Wiener Straße 12, 28359 Bremen, Germany;3. Fraunhofer Institute for Mechanics of Materials, IWM, Wöhlerstraße 11, 79108 Freiburg, Germany;1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, Guangdong, China;2. China Building Material Test and Certification Center, Beijing 100024, China;1. Fraunhofer Institute for High-Speed Dynamics, Ernst-Mach-Institut, EMI, Eckerstr. 4, 79104 Freiburg, Germany;2. JSOL Corporation, 2-5-24, Harumi, Chuo ward, Tokyo, Japan;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. 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 tensile strength of structural adhesive butt joints was determined with a modified split Hopkinson pressure bar using hat-shaped specimens. A typical two-part structural epoxy adhesive (Scotch weld® DP-460) and two different adherend materials (Al alloy 7075-T6 and commercially pure titanium) were used in the adhesion tests. The impact tensile strength of adhesive butt joints with similar adherends was evaluated from the peak value of the applied tensile stress history. The corresponding static tensile strengths were measured on an Instron testing machine using joint specimens of the same geometry as those used in the impact tests. An axisymmetric finite element analysis was performed to investigate the static elastic stress distributions in the adhesive layer of the joint specimens. The effects of loading rate, adherend material and adhesive thickness on the joint tensile strength were examined. The joint tensile strength was clearly observed to increase with the loading rate up to an order of 106 MPa/s, and decrease gradually with the adhesive thickness up to nearly 180 μm, depending on the adherend materials used. The loading rate dependence of the tensile strength was herein discussed in terms of the dominant failure modes in the joint specimens after static and impact testing. |
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| Keywords: | Epoxy Al alloy, pure titanium Butt joint, finite element stress analysis Impact |
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