Abstract
The stresses, deformations and porosities in vicinity of a blunting crack in different specimens were studied by a large-deformation finite element method. The presence and subsequent growth of smaller-scale voids were taken into account by using a modified Gurson model to describe the constitutive behavior of the material. The dependence of the stresses, deformations and porosities on specimen configurations was associated with the crack-tip constraint. The results showed that the constraint of different specimens was lower than that of the HRR singularity. The interaction between a crack and a hole in CT specimen was analyzed, and the results showed that the critical COD (crack tip opening displacement) was larger than that obtained in SSY model. The complete loss of the total carrying capacity in a ligament between the crack-tip and the hole was recommended as a crack initiation criterion.
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