A multiscale and multiphysics numerical framework for modelling of hygrothermal ageing in laminated composites
I.B.C.M. Rocha (TU Delft - Applied Mechanics, Knowledge Centre WMC)
F.P. van der Meer (TU Delft - Applied Mechanics)
R. P.L. Nijssen (Knowledge Centre WMC)
Lambertus J. Sluys (TU Delft - Applied Mechanics)
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Abstract
In this work, a numerical framework for modelling of hygrothermal ageing in laminated composites is proposed. The model consists of a macroscopic diffusion analysis based on Fick's second law coupled with a multiscale FE2 stress analysis in order to take microscopic degradation mechanisms into account. Macroscopic material points are modelled with a representative volume element with random fibre distribution. The resin is modelled as elasto-plastic with damage, and cohesive elements are included at the fibre/matrix interfaces. The model formulations and the calibration of the epoxy model using experimental results are presented in detail. A study into the representative volume element size is conducted, and the framework is demonstrated by simulating the ageing process of a unidirectional specimen immersed in water. The influence of transient swelling stresses on microscopic failure is investigated, and failure envelopes of dry and saturated micromodels are compared.
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