Abstract
The low-velocity impact behaviors of DP590/AA6061 self-piercing riveting (SPR) joints are studied at the impact energies of 5 J, 10 J, 20 J, 30 J, and room temperature (25 °C). The lap shear and fatigue tests, and the cross-sectional microscopies of joints are used to assess the mechanical property evolutions of the joints after low-velocity impact. The results show that the absorbed impact energies of SPR joints reach the critical value at an impact energy of 30 J, the exceeded impact energy causes crack failures in the sheets and decreases the interlocking performance of the joints. The static property and the absorbed energy of the SPR joints are reduced by 16% and 36% when the joints are impacted at 30 J, respectively. The low-velocity impacts do not change the failure forms of the joints, but significantly reduce the mechanical interlocking properties of the joints. The fatigue lives of the SPR joints are reduced due to low-velocity impact, and the impacted joints are more sensitive to cyclic loadings.
Highlights
Due to the development of lightweight materials and forming techniques, various lightweight materials are widely used in body structures to reduce weight, fuel consumption, and CO2 emissions, such as ultrahigh strength steels, aluminum alloys, titanium alloy, and so on [1, 2]
self-piercing riveting (SPR) joints are reduced due to low-velocity impact, and the impacted joints are more sensitive to cyclic loadings
Due to the better plastic deformation ability of DP590 steel, the DP590 high-strength steel was used as the upper plate, and AA6061 aluminum alloy was served as the lower plate in the SPR process
Summary
Due to the development of lightweight materials and forming techniques, various lightweight materials are widely used in body structures to reduce weight, fuel consumption, and CO2 emissions, such as ultrahigh strength steels, aluminum alloys, titanium alloy, and so on [1, 2]. Significant weight reduction through the extensive use of lightweight aluminum alloys and advanced high-strength steel materials has become the most important means of body-weight reduction [3]. Compared with conventional bolt-nut connection processes, self-piercing riveting (SPR) has the special advantages of no predrilling, fast forming speed, reliable connection, and high fatigue strength [9]. The SPR is broadly used in the connections of different materials, especially for the connections between ultra-high-strength steel and aluminum alloys [10, 11]
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