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Mechanical characterization of a steel-aluminum clinched joint under impact loading
Abstract The rate dependent mechanical response of a clinched joint was investigated experimentally and numerically in this paper. Two different types of metal sheets, steel DX51D + Z and aluminum alloy 5182-O, were used to fabricate the hybrid clinched joint samples. Both the quasi-static and the low-speed impact tests of the clinched joint were performed with coach-peel and lap-shear coupons, respectively. Influences of loading rate on the global force vs. displacement response and the failure mode of the joint were experimentally analyzed. A detailed finite element model of the joint was built and comparative simulations were carried out to identify the effect of joining process on the subsequent mechanical performance. Furthermore, the influence of strain-rate sensitivities from the base metals on the global rate-dependence of the joint response was evaluated based on observation of local stress and strain evolution. The results indicate that the strain hardening of base metals induced by the joining process is vital in numerically predicting both the static and the dynamic strength of the clinched joint. Compared to coach-peel, the local deformation mode in lap-shear better enhances the contribution of strain-rate effect from the steel side to the dynamic strength of the hybrid clinched joint.
Highlights Process-induced strain-hardening significantly influences clinched joint strength. Steel-aluminum clinched joint presents dynamic strengthening effect. Dynamic strengthening effect varies with loading modes. Rate dependence of base metals plays a critical role in dynamic strengthening.
Mechanical characterization of a steel-aluminum clinched joint under impact loading
Abstract The rate dependent mechanical response of a clinched joint was investigated experimentally and numerically in this paper. Two different types of metal sheets, steel DX51D + Z and aluminum alloy 5182-O, were used to fabricate the hybrid clinched joint samples. Both the quasi-static and the low-speed impact tests of the clinched joint were performed with coach-peel and lap-shear coupons, respectively. Influences of loading rate on the global force vs. displacement response and the failure mode of the joint were experimentally analyzed. A detailed finite element model of the joint was built and comparative simulations were carried out to identify the effect of joining process on the subsequent mechanical performance. Furthermore, the influence of strain-rate sensitivities from the base metals on the global rate-dependence of the joint response was evaluated based on observation of local stress and strain evolution. The results indicate that the strain hardening of base metals induced by the joining process is vital in numerically predicting both the static and the dynamic strength of the clinched joint. Compared to coach-peel, the local deformation mode in lap-shear better enhances the contribution of strain-rate effect from the steel side to the dynamic strength of the hybrid clinched joint.
Highlights Process-induced strain-hardening significantly influences clinched joint strength. Steel-aluminum clinched joint presents dynamic strengthening effect. Dynamic strengthening effect varies with loading modes. Rate dependence of base metals plays a critical role in dynamic strengthening.
Mechanical characterization of a steel-aluminum clinched joint under impact loading
Ge, Yulong (author) / Xia, Yong (author)
Thin-Walled Structures ; 151
2020-03-25
Article (Journal)
Electronic Resource
English
Equivalent modelling strategy for a clinched joint using a simple calibration method
| Online Contents | 2017