Numerical Simulations of Hole Growth and Ductile Fracture Initiation Under Mixed-Mode Loading

Ghosal, AK and Narasimhan, R (1996) Numerical Simulations of Hole Growth and Ductile Fracture Initiation Under Mixed-Mode Loading. In: International Journal of Fracture, 77 (4). pp. 281-304.

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Abstract

Numerical simulations of ductile fracture initiation caused by the interaction between a notch tip and a nearby hole under mixed-mode loading involving modes I and II are performed. Attention is restricted to plane strain, small-scale yielding conditions. The Gurson constitutive model that accounts for the ductile failure mechanisms of micro-void nucleation, growth and coalescence is employed within the framework of a finite deformation plasticity theory. The failure of the ligament connecting the notch tip and the hole by either microvoid coalescence or by intense plastic strain localization is modelled. The effect of mode-mixity on the notch tip deformation, hole growth and the critical value of J at fracture initiation is examined. The dominant failure mechanism which is operative near the notch tip for various extents of mixity of modes I and II is identified.

Item Type:	Journal Article
Publication:	International Journal of Fracture
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	20 Nov 2006
Last Modified:	19 Sep 2010 04:31
URI:	http://eprints.iisc.ac.in/id/eprint/8554

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