期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 51, 期 1, 页码 127-146出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0022-5096(02)00055-8
关键词
ductility; anisotropic material; particulate reinforced material; finite elements
The effect of particle clustering on void damage rates in a ductile material under triaxial loading conditions is examined using three-dimensional finite element analysis. An infinite material containing a regular distribution of clustered particles is modelled using a unit cell approach. Three discrete particles are introduced into each unit cell while a secondary population of small particles within the surrounding matrix is represented using the Gurson-Tvergaard-Needleman (GTN) constitutive equations. Deformation strain states characteristic of sheet metal forming are considered; that is, deep drawing, plane strain and biaxial stretching. Uniaxial tensile stress states with varying levels of superimposed hydrostatic tension are also examined. The orientation of a particle cluster with respect to the direction of major principal loading is shown to significantly influence failure strains. Coalescence of voids within a first-order particle cluster (consisting of three particles) is a stable event while collapse of inter-cluster ligaments leads to imminent material collapse through void-sheeting. (C) 2002 Elsevier Science Ltd. All rights reserved.
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