Growth behavior of sawtoothed interface under plane strain compression - compression of similar and dissimilar blocks twinned -
Gotoh Manabu; Yamashita Minoru; Chung Tae-Hoon; Matsuno Masanobu
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 1 mm and the initial sawtooth angles of the interface are 60 degree and 90 degree similar to the previous ones. Soft pure aluminum (A1050-0), soft or hard aluminum alloy (A5056-0, H) and pure copper (C1100-0, 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 degree. 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 degree is greater than that of 90 degree. 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 con6rmed that the tendency of the general deformation pattern is consistent with the experiment. Key Words:plasticity, plane strain compression, sawtoothed interface, Growth behavior, dissimilar material twinned, finite element method