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Numerical simulations of fracture initiation in ductile solids under mode I, dynamic loading

Narasimhan, R and Basu, S (1999) Numerical simulations of fracture initiation in ductile solids under mode I, dynamic loading. In: Bulletin of Materials Science, 22 (5). pp. 891-900.

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Abstract

In this paper, an overview of some recent computational studies by the authors on ductile crack initiation under mode I, dynamic loading is presented. In these studies, a large deformation finite element procedure is employed along with the viscoplastic version of the Gurson constitutive model that accounts for the micro-mechanical processes of void nucleation, growth and coalescence. A three-point bend fracture specimen subjected to impact, and a single edge notched specimen loaded by a tensile stress pulse are analysed. Several loading rates are simulated by varying the impact speed or the rise time and magnitude of the stress pulse. A simple model involving a semi-circular notch with a pre-nucleated circular hole situated ahead of it is considered. The growth of the hole and its interaction with the notch tip, which leads to plastic strain and porosity localization in the ligament connecting them, is simulated. The role of strain-rate dependence on ductile crack initiation at high loading rates, and the specimen geometry effect on the variation of dynamic fracture toughness with loading rate are Investigated.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Keywords: Ductile fracture;dynamic loading;strain-rate dependence; finite elements.
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 29 Jun 2011 05:21
Last Modified: 29 Jun 2011 05:21
URI: http://eprints.iisc.ernet.in/id/eprint/38700

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