Abstract
Short-fibre-reinforced thermoplastics (SFRT) show significantly greater corner-warpage in injection moulding compared with non-reinforced systems. It is therefore suggested that this additional warpage effect is attributed to the anisotropy of the material. According to the micro-structure of SFRT, which usually show a boundary–core–boundary layer structure, a multi-layer model is used for calculating the thermoelastic problem of cooling a cylindrical segment. A generalised plane-strain state is assumed. The model predicts the full deformation state as well as the residual stresses. For each single layer an orthotropic constitutive equation is used. The material data are calculated from images of polished cross-sections together with a micromechanical model. The model predictions are compared with the warpage of a specially designed experimental component. This comparison shows that the additional warpage observed for short-fibre-reinforced materials can be attributed to the ansiotropy of the material.
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