New Crushing Strength Formula of Aluminum Honeycomb with Thinning Cell Wall

An aluminum honeycomb which has etched cell wall is used as a shock absorbent material for the offset frontal collision test and the side collision test of automobile. In this study, based on the analyses of the shock absorption mechanism, a new crushing strength formula is proposed. Firstly, load-displacement curves obtained from compression tests in quasi-static condition showed almost linear relation between a thinning rate of cell walls R and a crushing strength. Secondly, based on Wierzbicki's theory, a new formula was proposed, which can estimate a crushing strength of honeycomb material with thinning wall. Thirdly, parametric analyses were carried out with FEM model which can simulate a delamination between cell walls. The results which were obtained from theory and FEM almost corresponded to each other for a wide range of core ratio. The proposed formula works well for R