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Modelling the curing process in magneto-sensitive polymers: Rate-dependence and shrinkage

Mokarram Hossain Orcid Logo, Prashant Saxena

International Journal of Non-Linear Mechanics, Volume: 74, Issue: -, Pages: 108 - 121

Swansea University Author: Mokarram Hossain Orcid Logo

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DOI (Published version): 10.1016/j.ijnonlinmec.2015.04.008

Abstract

This paper deals with a phenomenologically motivated magneto-viscoelastic coupled finite strain framework for simulating the curing process of polymers under the application of a coupled magneto-mechanical load. Magneto-sensitive polymers are prepared by mixing micron-sized ferromagnetic particles i...

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Published in: International Journal of Non-Linear Mechanics
Published: Elsevier-London Elsevier 2015
Online Access: https://www.sciencedirect.com/science/article/pii/S0020746215000797#!
URI: https://cronfa.swan.ac.uk/Record/cronfa39635
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Abstract: This paper deals with a phenomenologically motivated magneto-viscoelastic coupled finite strain framework for simulating the curing process of polymers under the application of a coupled magneto-mechanical load. Magneto-sensitive polymers are prepared by mixing micron-sized ferromagnetic particles in uncured polymers. Application of a magnetic field during the curing process causes the particles to align and form chain-like structures lending an overall anisotropy to the material. The polymer curing is a viscoelastic complex process where a transformation from fluid to solid occurs in the course of time. During curing, volume shrinkage also occurs due to the packing of polymer chains by chemical reactions. Such reactions impart a continuous change of magneto-mechanical properties that can be modelled by an appropriate constitutive relation where the temporal evolution of material parameters is considered. To model the shrinkage during curing, a magnetic-induction-dependent approach is proposed which is based on a multiplicative decomposition of the deformation gradient into a mechanical and a magnetic-induction-dependent volume shrinkage part. The proposed model obeys the relevant laws of thermodynamics. Numerical examples, based on a generalised Mooney–Rivlin energy function, are presented to demonstrate the model capacity in the case of a magneto-viscoelastically coupled load.
Keywords: Magneto-sensitive polymers, Polymer curing, Magneto-mechanical coupled problem, Magneto-viscoelasticity, Curing shrinkage
College: College of Engineering
Issue: -
Start Page: 108
End Page: 121