Multi-scale modelling of thermoplastic-based woven composites, cyclic and time-dependent behaviour

Abstract : In this thesis, a multi-scale model established from the concept of periodic homogenization is utilized to study the cyclic and time-dependent response of thermoplastic-based woven composites. With the proposed approach, the macroscopic behaviour of the composite is determined from a finite element simulation of the representative unit cell of the periodic microstructure, where the local constitutive behaviours of the components are directly integrated, namely: the matrix and the yarns. The local response of the thermoplastic matrix is described by a phenomenological multi-mechanisms constitutive model accounting for viscoelasticity, viscoplasticity and ductile damage. For the yarns, a hybrid micromechanical-phenomenological constitutive model is considered. The latter accounts for anisotropic damage and anelasticity induced by the presence of a diffuse micro-crack network through the micromechanical description of a micro-cracked representative volume element. The capabilities of the multi-scale model are validated by comparing the numerical prediction with experimental data. The capabilities of the model are also illustrated through several examples where the composite undergoes time-dependent deformations under monotonic loading, constant or cyclic stress levels and non-proportional multi-axial loading. Furthermore, the multi-scale model is also employed to analyse the influence of the local deformation processes on the macroscopic response of the composite.
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Francis Praud. Multi-scale modelling of thermoplastic-based woven composites, cyclic and time-dependent behaviour. Mécanique des matériaux [physics.class-ph]. Ecole nationale supérieure d'arts et métiers - ENSAM, 2018. Français. ⟨NNT : 2018ENAM0018⟩. ⟨tel-01936624⟩

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