Abstract
Many thin wall closed section members made of steel are used for the traffic machine such as an automobile. In these members, the local buckling under compressive stress is mentioned as a main problem. As a method for improving the performance, the technique which fills the inside of closed section with the low-density foaming material is used. In this study, axial compression and 3-point bending tests were carried out on the composite material which filled 2 kinds of epoxy resin foaming material in which the foaming rate (density) is different for hat type thin-walled cross section member. The difference of composite member and thin-walled member was investigated on elasticity and plastic collapse characteristics at the various deformation velocities. The adhesive strength between thin-walled member and foaming material, and filling effect of the foaming material in the energy absorption characteristics was clarified.
