ON THE PLASTIC YIELDING OF POROUS METALS

被引：17
作者：
MEAR, ME
机构：
[1] The University of Texas at Austin, Department of Aerospace Engineering and Engineering Mechanics, Austin
来源：
MECHANICS OF MATERIALS | 1990年 / 9卷 / 01期
关键词：
D O I：
10.1016/0167-6636(90)90028-E
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Accurate numerical results are presented for the stress-strain response of an elastic-plastic material containing a cubic array of spherical voids. Cases of both proportional macroscopic stressing and non-proportional macroscopic stressing are examined, and the numerical results are compared with the predictions of Gurson's (1977a, b) theory and Tvergaard's (1982) modification of it. It is determined that Gurson's original theory performs adequately in predicting the stress-strain response for the porous solid, at least for the axisymmetric stress histories investigated. In addition, the structure of the macroscopic yield surface is explored in detail, and it is demonstrated that a vertex exists at the loading point despite the fact that the plasticity formulation used to model the matrix material is characterized by a smooth yield function. © 1990.
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页码：33 / 48
页数：16
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