Influence of crack tip constraint on void growth in pressure sensitive plastic solids-1: 2D analysis

Subramanya, HY and Viswanath, S and Narasimhan, R (2007) Influence of crack tip constraint on void growth in pressure sensitive plastic solids-1: 2D analysis. Engineering Fracture Mechanics, 75. pp. 1045-1063.

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In this work, the effect of constraint on void growth near a notch tip under mode-I loading is investigated in materials13; exhibiting pressure sensitive yielding and plastic dilatancy. To this end, large deformation elasticx2013;plastic finite element13; analyses are performed using a two-dimensional (2D) plane strain, modified boundary layer formulation by prescribing13; the elastic K T field as remote boundary conditions. The analyses are conducted for different values of K (or J) and13; T-stress. The material is assumed to obey a finite strain, Extended Druckerx2013;Prager yield condition. The roles of pressure13; sensitivity, plastic dilatancy and yield locus shape on the interaction between the notch and a nearby void are studied by13; examining the distribution of hydrostatic stress and plastic strain in the ligament connecting them as well as the growth of13; notch and the void. The results show that void growth with respect to J is enhanced due to pressure sensitivity, and more so13; when the plastic flow is non-dilatational. By contrast, irrespective of pressure sensitivity, loss of crack tip constraint can13; significantly retard void growth.

Item Type: Article
Uncontrolled Keywords: Pressure sensitive yielding;Constraint effects;Ductile fracture;Void growth;Finite elements
Subjects: ENGINEERING > Structural Mechanics
AERONAUTICS > Aeronautics (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 03 Jun 2009
Last Modified: 24 May 2010 04:26

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