Phase field modelling of rayleigh instabilities in the solid-state

Joshi, Chaitanya and Abinandanan, TA and Choudhury, Abhik (2016) Phase field modelling of rayleigh instabilities in the solid-state. In: ACTA MATERIALIA, 109 . pp. 286-291.

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Abstract

We have used a phase field model to study Rayleigh instability driven evolution of a cylindrical pore. The key feature in the model is its ability to incorporate surface diffusion as the mechanism for mass transport. We first benchmark our model with analytical results for growth rates of sinusoidal perturbations imposed on the surface of a cylindrical pore of radius R at early times. We then use the model to predict breakdown of infinite cylindrical pores; the principal finding from our analysis is that time to failure scales as R-4. We have also studied the break-up of closed and open cylindrical pores of finite length; a series of about five spherical pores get pinched off sequentially at the cylinder ends before the middle parts of the pore break up. Compared to the first closure event in an infinite pore, the first pinch off event in closed and open pores is faster by about 4 times and 25 times, respectively. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	ACTA MATERIALIA
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Additional Information:	Copy right for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Keywords:	Rayleigh instability; Phase-field model; Nanopores; Porous membranes
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	15 Jun 2016 07:32
Last Modified:	15 Jun 2016 07:32
URI:	http://eprints.iisc.ac.in/id/eprint/53962

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