A finite element study of the effect of void initiation and growth on mixed-mode ductile fracture

Ghosal, AK and Narasimhan, R (1997) A finite element study of the effect of void initiation and growth on mixed-mode ductile fracture. In: Mechanics of Materials, 25 (2). pp. 113-127.

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Abstract

In this work, finite element simulations of the initiation of a void by debonding around a large, rigid inclusion and its interaction with a notch tip under mixed-mode loading involving Modes I and II are performed. The analyses are carried out under plane strain, small-scale yielding conditions. The background material is represented by the Gurson constitutive model and micro-void fiucleation at uniformly distributed small size particles is also taken into account. Two sets of analyses with different critical interfacial strengths for the matrix-inclusion interface are conducted. The failure of the ligament connecting the notch tip with the void (that has grown around the inclusion) by either micro-void coalescence or by shear crack propagation is simulated and the operative failure mechanism is identified for various mode-mixities. The effect of mode-mixity on the deformation of the notch and growth of the void near it are investigated. Finally, the variation of the critical value of the J integral associated with complete failure of the ligament versus mode-mixity is examined. It is found that the strength of the matrix-inclusion interface may be an important factor that influences the above variation.

Item Type:	Journal Article
Additional Information:	Copyright of this article belongs to Elsevier.
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	23 Jun 2007
Last Modified:	19 Sep 2010 04:36
URI:	http://eprints.iisc.ernet.in/id/eprint/10171

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