Multi-component chemo-mechanics based on transport relations for the chemical potential
Computer Methods in Applied Mechanics and Engineering, vol. 365, pp. 113029
Abstract
A chemo-mechanical model for a finite-strain elasto-viscoplastic material containing multiple chemical components is formulated and an efficient numerical implementation is developed to solve the resulting transport relations. The numerical solution relies on inverting the constitutive model for the chemical potential. In this work, a semi-analytical inversion for a general family of multi-component regular-solution chemical free energy models is derived. This is based on splitting the chemical free energy into a convex contribution, treated implicitly, and a non-convex contribution, treated explicitly. This results in a reformulation of the system transport equations in terms of the chemical potential rather than the composition as the independent field variable. The numerical conditioning of the reformulated system, discretised by finite elements, is shown to be significantly improved, and convergence to the Cahn–Hilliard solution is demonstrated for the case of binary spinodal decomposition. Chemo-mechanically coupled binary and ternary spinodal decomposition systems are then investigated to illustrate the effect of anisotropic elastic deformation and plastic relaxation of the resulting spinodal morphologies in more complex material systems.
Authors 5
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Pratheek Shanthraj corresponding
University of Manchester · Max-Planck-Institut für Nachhaltige Materialien
Affiliation as printed
Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
The Department of Materials, The University of Manchester, Manchester M1 3BB, UK
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Chuanlai Liu corresponding
Max-Planck-Institut für Nachhaltige Materialien
Affiliation as printed
Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
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RWTH Aachen University · Max-Planck-Institut für Nachhaltige Materialien
Affiliation as printed
Material Mechanics, RWTH Aachen University, Schinkelstraße 2, 52062 Aachen, Germany
Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
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RWTH Aachen University · Max-Planck-Institut für Nachhaltige Materialien
Affiliation as printed
Material Mechanics, RWTH Aachen University, Schinkelstraße 2, 52062 Aachen, Germany
Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
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Max-Planck-Institut für Nachhaltige Materialien
Affiliation as printed
Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
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