摘要
ＥｆｆｅｃｔｏｆＳｔｒａｉｎ－ＲａｔｅＳｅｎｓｉｔｉｖｉｔｙｏｎＤｅｆｏｒｍａｔｉｏｎＬｏｃａｌｉｚａｔｉｏｎｉｎＰｏｒｏｕｓＭａｔｅｒｉａｌｓＳＵＮＹｉ（孙毅）（Ｄｅｐｔ．ｏｆＡｓｔｒｏｎａｕｔｉｃｓａｎｄＭｅｃｈａｎｉｃｓ，Ｈａｒｂｉｎｉｎｓｔｉ...
The deformation localization in strain-rate sensitive porous materials is analyzed based on the lower bound approach proposed by the author. The retarding effect of material viscosity on deformation localization and the influence of the material strain-rate sensitivity factor on the critical strain to localized necking and the shear localization are investigated. Consideration concerning the material inhomogeneity and the void nucleation effect is also given. Finally the fracture strains of the plane strain tension specimens of AISI4340 steels are calculated and the results are compared with those of the experiment and of Gurson's equations.
