Modeling of manufacturing of thermoplastic composites and residual stress prediction

Abstract

The paper describes a model for simulation of residual stresses and process-induced cracks in thermoplastic fibre-reinforced composites. The main aspect of the research is the modeling of phase transitions in thermoplastic matrix, taking into account changes in the matrix mechanical properties and shrinkage. An experimental comparison of modeling results for all mechanical characteristics at all stages of material phase transformation is provided. Equations for modeling of all key processes related to temperature cycle of a thermoplastic matrix solidification are provided together with corresponding material constants, using polyetheretherketone (PEEK) as an example. Approach to modeling of process-induced defects in thermoplastic matrix in dependence of crystallinity degree and different temperature conditions is proposed.