Abstract
Thermo-oxidative ageing has a significant impact on the mechanical properties of 3D angle-interlock woven composites, but there is no simulation research on the thermo-oxidative ageing behavior of composites. This study developed a coupled thermo-chemical-mechanical multiphysics model using a multi-step parallel algorithm to simulate the thermo-oxidative ageing process of 3D angle-interlock woven composites. The model focuses on the thermo-chemical-mechanical weak coupling between the oxidation reaction of the oxygen diffusion and the thermodynamics of the temperature change while considering the residual stress state of the composite after curing. The oxidized layer distribution and interface cracks in finite element analysis have good agreement with nanoindentation and microscope experiments, validating the effectiveness of the model. The numerical results are in good agreement with the experimental dates. The proposed model contributes to evaluating the complex stress and interface damage related to multiphysics coupling in the composite during thermo-oxidative ageing.
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