Ductile fracture by multiple void growth and interaction ahead of a notch tip in polycrystalline plastic solids

Sreeramulu, K and Biswas, P and Narasimhan, R and Mishra, RK (2013) Ductile fracture by multiple void growth and interaction ahead of a notch tip in polycrystalline plastic solids. In: International Journal of Fracture, 180 (2). pp. 145-161.

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Abstract

The objectives of this paper are to study the effects of plastic anisotropy and evolution in crystallographic texture with deformation on the ductile fracture behaviour of polycrystalline solids. To this end, numerical simulations of multiple void growth and interaction ahead of a notch tip are performed under mode I, plane strain, small scale yielding conditions using two approaches. The first approach is based on the Hill yield theory, while the second employs crystal plasticity constitutive equations and a Taylor-type homogenization in order to represent the ductile polycrystalline solid. The initial textures pertaining to continuous cast Al-Mg AA5754 sheets in recrystallized and cold rolled conditions are considered. The former is nearly-isotropic, while the latter displays pronounced anisotropy. The results indicate distinct changes in texture in the ligaments bridging the voids ahead of the notch tip with increase in load level which gives rise to retardation in porosity evolution and increase in tearing resistance for both materials.

Item Type:	Journal Article
Publication:	International Journal of Fracture
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Keywords:	Void Growth; Fracture Resistance; Texture; Finite Element Analysis
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	12 Apr 2013 06:21
Last Modified:	12 Apr 2013 06:21
URI:	http://eprints.iisc.ac.in/id/eprint/46301

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