Failure of aluminium self-piercing rivets: An experimental and numerical study |
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| Affiliation: | 1. Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit, Beijing University of Technology of Technology, Beijing, China;2. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei Province, China;3. Department of Engineering Technology, University of North Texas, Denton, TX, United States;4. School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing, China;1. Innovative Manufacturing Research Centre, Kunming University of Science and Technology, Kunming 650500, P R China;2. Centre for Efficiency and Performance Engineering, University of Huddersfield, Queensgate, Huddersfield, HD1 3DH, UK |
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| Abstract: | The present paper investigates the fracture mechanisms of AA7278-T6 aluminium self-piercing rivets under compression during the riveting process. First, a microstructure investigation was conducted to disclose the grain structure and the particle distribution of the extruded aluminium alloy. Transmission electron micrographs revealed precipitate free zones along grain boundaries. Uniaxial tensile tests in three different directions with respect to the extrusion direction revealed anisotropy of the alloy in strength and ductility and a change in fracture mode with tensile direction. The behaviour of the alloy under compression was studied experimentally using upsetting tests and self-piercing riveting tests. Micrographs of the deformed specimens provided insight into the influence of the microstructure on the deformation and fracture of the alloy under compression. Second, numerical analyses were carried out using a 2-D axisymmetric model in LS–DYNA in an attempt to investigate the role of different physical variables on the final failure of the rivet. The numerical results revealed that constituent particles, precipitate free zones, and friction between the rivet and plates are important for strain localisation and fracture in the rivet. |
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