平面ひずみ圧縮を受ける鋸歯状積層界面の成長挙動 同種および異種材料の積層圧縮

Abstract

Under plane strain compression of two blocks with sawtoothed interface, the sawtooth growth occurred. In the previous paper it was presumed that such growth was caused by the shear-band formation starting from the tip of sawtooth and its degree depended on the material properties of the block. In this paper, the height and width of tested block are 1.6 times and about 2 times larger than those in the previous paper, respectively. The sawtooth pitch is 1mm and the initial sawtooth angles of the interface are 60° and 90° similar to the previous ones. Soft pure aluminum (A1050-O), soft or hard aluminum alloy (A5056-O, H) and pure copper (C1100-O, H) are used. Compression in the case where similar blocks are twinned and also compression in the case where dissimilar blocks are twinned are carried out in the condition of lubricated interface. Furthermore, in the latter, compression where the interface is degreased is also performed. The degree of growth is experimentally investigated. Moreover, numerical simulations are carried out by the elastic-plastic FEM for the case of the dissimilar blocks with the initial sawtooth angle of 60°. In the similar block experiment, the work-hardened material yields larger growth than the annealed material, and the growth in the case of initial sawtooth angle 60° is greater than that of 90°. Larger ratio of total height to sawtooth height gives larger growth. In the case where the dissimilar blocks are twinned, larger difference between material properties leads to smaller growth, and the degreased interface leads to smaller growth than that in the lubricated one. Furthermore, by the simulation of compression where dissimilar blocks are twinned, it is confirmed that the tendency of the general deformation pattern is consistent with the experiment.