The plastic behavior of sandwich beams with core gradation

Abstract

The objective of this paper is to study the large deflection of a fully clamped sandwich beam under high-velocity impact by considering the time in-homogeneity of the core deformation. Firstly, a unified dynamic yielding criterion for metallic sandwich beams considering the mass redistribution along with the core compression is proposed. Different from the traditional yielding surface, when the core is partially densified, the yield surface is asymmetric. The well-known yielding criterion for the solid monolithic beam is a special case of our model. Moreover, a membrane factor is proposed and an analytical solution for the large deflection of the beam under blasting loading is given. Comparison of the analytical solutions with numerical ones reveals that the present analytical model improves the prediction accuracy of the high-velocity impact response of fully clamped sandwich beams. Moreover, the present analytical method can also be degenerated to predict the low velocity/energy impact response of sandwich beams.

A dynamic homogenization model for long-wavelength wave propagation in corrugated sandwich plates

“…Sandwich structures, which consist of top and bottom face sheets and a relatively soft core sandwiched between them, have excellent mechanical properties in comparison with traditional solid structures, such as high specific stiffness and high specific strength [1,2]. Therefore, sandwich structures have wide applications in various fields including aeronautics, astronautics, shipping, and railway [3][4][5]. The cores of sandwich structures are conventionally made of foams or honeycombs [6].…”