Dynamic growth of tensile cracks by ductile and brittle fracture mechanisms in a viscoplastic material

Kumar, Krishna R and Narasimhan, R and Prabhakar, O (1992) Dynamic growth of tensile cracks by ductile and brittle fracture mechanisms in a viscoplastic material. In: Acta Metallurgica et Materialia, 40 (7). pp. 1563-1572.

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Abstract

In this paper, a finite element analysis of steady-state dynamic crack growth under Mode I, plane strain, small-scale yielding conditions is performed in a rate dependent plastic material characterized by the over-stress model. The main objective of the paper is to obtain theoretically the dependence of dynamic fracture toughness on crack speed. Crack propagation due to a ductile (micro-void) mechanism or a brittle (cleavage) mechanism, as well as transition from one mode to another are considered. The conversion from ductile to brittle has been observed experimentally but has received very little attention using analytical methods. Local fracture criteria based on strains and stresses are used to describe ductile and brittle fracture mechanisms. The results obtained in this paper are in general agreement with micro-structural observations of mode conversion during fracture initiation. Finally, the particular roles played by material rate sensitivity and inertia are examined in some detail.

Item Type:	Journal Article
Publication:	Acta Metallurgica et Materialia
Publisher:	Elsevier science
Additional Information:	Copyright of this article belongs to Elsevier science.
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	25 Jan 2011 04:25
Last Modified:	25 Jan 2011 04:25
URI:	http://eprints.iisc.ac.in/id/eprint/35187

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