A modelling of the direct couplings between heat transfer, mass transport, chemical reactions and mechanical behaviour. Numerical implementation to explosive decompression

A systematic procedure is proposed to address the coupled thermo-diffuso-chemo-mechanical material behaviour. It is built within the formal framework of the thermodynamics of irreversible processes with internal variables and linear phenomenological relations. The volume element is considered as a classical homogeneous continuous mixture of chemically active species. Based on some simplifying assumptions (isotropy and small perturbations), the general macroscopic continuum formulation obtained is detailed in the restricted case of elasticity. Its implementation in the industrial finite element software ABAQUS™ is then made by considering a non-reacting bi-components mixture. It leads to a first exploratory study of the effects of direct couplings on the in-service behaviour of structural composite materials exposed to strongly fluctuating gas pressure.