A comparative study of dynamic,ductile fracture initiation in two specimen configurations

Basu, S and Narasimhan, R (2000) A comparative study of dynamic,ductile fracture initiation in two specimen configurations. In: International Journal of Fracture, 102 (4). pp. 393-410.

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Abstract

In this work a single edge notched plate (SEN(T)) subjected to a tensile stress pulse is analysed, using a 2D plane strain dynamic finite element procedure. The interaction of the notch with a pre-nucleated hole ahead of it is examined. The background material is modelled by the Gurson constitutive law and ductile failure by microvoid coalescence in the ligament connecting the notch and the hole is simulated. Both rate independent and rate dependent material behaviour is considered. The notch tip region is subjected to a range of loading rates j by varying the peak value and the rise time of the applied stress pulse. The results obtained from these simulations are compared with a three point bend (TPB) specimen subjected to impact loading analysed in an earlier work [3] The variation of J at fracture initiation, J(c), with average loading rate j is obtained from the finite element simulations. It is found that the functional relationship between J(c) and j is fairly independent of the specimen geometry and is only dependent on material behaviour.

Item Type:	Journal Article
Publication:	International Journal of Fracture
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Keywords:	dynamic;ductile fracture initiation;finite elements; microvoid coalescence;specimen configuration
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	16 Jul 2010 10:55
Last Modified:	19 Sep 2010 06:11
URI:	http://eprints.iisc.ac.in/id/eprint/30233

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