Finite element simulations of notch tip fields in magnesium single crystals

Kaushik, V and Narasimhan, R and Mishra, Raja K (2014) Finite element simulations of notch tip fields in magnesium single crystals. In: INTERNATIONAL JOURNAL OF FRACTURE, 189 (2). pp. 195-216.

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Abstract

Recent experiments using three point bend specimens of Mg single crystals have revealed that tensile twins of {10 (1) over bar2}-type form profusely near a notch tip and enhance the fracture toughness through large plastic dissipation. In this work, 3D finite element simulations of these experiments are carried out using a crystal plasticity framework which includes slip and twinning to gain insights on the mechanics of fracture. The predicted load-displacement curves, slip and tensile twinning activities from finite element analysis corroborate well with the experimental observations. The numerical results are used to explore the 3D nature of the crack tip stress, plastic slip and twin volume fraction distributions near the notch root. The occurrence of tensile twinning is rationalized from the variation of normal stress ahead of the notch tip. Further, deflection of the crack path at twin-twin intersections observed in the experiments is examined from an energy standpoint by modeling discrete twins close to the notch root.

Item Type:	Journal Article
Publication:	INTERNATIONAL JOURNAL OF FRACTURE
Publisher:	SPRINGER
Additional Information:	Copy right for this article belongs to the SPRINGER, VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
Keywords:	Notch tip fields; Twinning; Crystal plasticity; Finite elements; Magnesium single crystals
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	28 Nov 2014 05:36
Last Modified:	28 Nov 2014 05:36
URI:	http://eprints.iisc.ac.in/id/eprint/50340

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