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Chemo-thermomechanical ageing of elastomers based on multiphase continuum mechanics

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Abstract

This article concerns the constitutive representation of one of the chemical ageing processes that occur in elastomers, chemo-thermomechanical ageing, which takes place as an irreversible, time-delayed chemical reaction when a medium diffuses into an unlike solid. This process is inhomogeneous in component parts of finite thickness, and as it can be thermally activated, ageing is accelerated on an increase in temperature. The application of multiphase continuum mechanics to these basic characteristics enables a thermodynamically coupled material model to be formulated, which is able to describe not only the viscoelasticity, but also the chemical decomposition and reformation processes that occur in the polymer network. The evolution principle of Liu-Müller is used to evaluate the thermomechanical consistency of the model obtained. Subsequent to this, the finite element method is applied to solve the resulting set of partial equations, which corresponds to a coupled multifield problem. The article closes with convincing simulations of illustrative examples.

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  1. Institute of Mechanics, Universität der Bundeswehr München, Werner-Heisenberg-Weg 39, 85579, Neubiberg, Germany

    Michael Johlitz & Alexander Lion

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  1. Michael Johlitz
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  2. Alexander Lion
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Correspondence to Michael Johlitz.

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Communicated by Andreas Öchsner.

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Johlitz, M., Lion, A. Chemo-thermomechanical ageing of elastomers based on multiphase continuum mechanics. Continuum Mech. Thermodyn. 25, 605–624 (2013). https://doi.org/10.1007/s00161-012-0255-8

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