Plastic behaviour of clamped double-layer foam-filled double-arrow negative Poisson’s ratio core sandwich beams

Abstract

This paper proposes a double-layer foam-filled double-arrow negative Poisson’s ratio core sandwich (FDNPS) beam that combines the high static load-bearing capacity of corrugated panels with the energy-absorption capabilities of metal foam. In this paper, the yield criterion for the double-layer FDNPS beam’s cross-section is proposed, and an analytical model for the plastic behaviour of the clamped double-layer FDNPS beam is developed. Furthermore, the bending characteristics of the sandwich beam are investigated by finite element analysis, and the numerical results agree well with the theoretical results. Additionally, it is used to analyze the impact of geometric parameters on the bending behaviour of the double-layer FDNPS beams with constant-thickness layers. The results show that as the thickness of the folded-plate and the angle θ of the folded-plate increase, the beam bears more load and absorbs more energy. In comparison, the effect of the folded-plate angle φ is the opposite, with an increase in φ resulting in a decrease in both the bearing-load and energy absorption. The theoretical model proposed can effectively describe the static-plastic behaviour of clamped double-layer FDNPS beam.