The effect of adhesive thickness on tensile and shear strength of polyimide adhesive |
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| Affiliation: | 1. National Institute for Materials Science, Hybrid Materials Unit, Composite Materials Group, 1-2-1 Sengen, Tsukuba, Ibaraki 305 0047, Japan;2. Tokyo University of Science, Faculty of Industrial Science and Technology, 2641 Yamazaki, Noda, Chiba 278 8510, Japan;1. Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal;2. Faculdade de Ciências Económicas, Sociais e da Empresa, Universidade Lusófona do Porto, Rua Augusto Rosa, 24, 4000-098 Porto, Portugal;3. Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal;4. INEGI—Instituto de Engenharia Mecânica e Gestão Industrial, Rua Dr. Roberto Frias, 400, 4200-465 Porto, Portugal;1. School of Mechanical Engineering, Tongji University, 4800, Cao׳an Highway, Shanghai 201804, China;2. Global Research & Development Center, General Motors Corporation, Warren, MI 48090-9055, USA |
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| Abstract: | The effect of adhesive thickness on tensile and shear strength of a polyimide adhesive has been investigated. Tensile and shear tests were carried out using butt and single lap joints. Commercially available polyimide (Skybond 703) was used as adhesive and aluminum alloy (5052-H34) was used as adherends. The tensile strength of the butt joints decreased with increasing adhesive thickness. In contrast, adhesive thickness did not seem to affect the shear strength of single lap joints. The fabricated joints using the polyimide adhesive failed in an interfacial manner regardless of adhesive thickness. The linear elastic stress analysis using a finite element method (FEM) indicates that the normal stress concentrated at the interface between the adherend and the adhesive. The FEM analysis considering the interfacial stress well explains the effect of adhesive thickness on the joint strength. |
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