Abstract
Steel/polymer/steel sandwich materials (SMs) are considered an innovative substitute to the commercial steel sheets in the automotive industry due to weight-saving potential and enhanced damping properties. Deep-drawing steel and thermoplastic core are used as the skin and core sheets, respectively. The mono-materials and SMs were characterized via tensile test, deep drawing and flow limit curves (FLC) determination. The mechanical properties of the tested SMs showed a good matching with the mixture rule regardless the skin/core sheet thickness. Varying the skin/core sheet thickness has a remarkable effect on the thinning behavior under deep drawing; the core thickness increases the cracking probability. In case of using SMs with different skin-thickness, it is better to position the thin skin sheet in contact with the punch. The core thickness exhibited no significant effect on the FLC results. The thicker-core SMs are subjected to failure at lower strains in the stretching region of the FLC.
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