The use of thermoplastics in the automotive industry is continuously increasing. Design parts require characterization and numerical modelling thermo-mechanical behaviour those materials under wide strain rate (0–300 s−1) temperature ranges (−30 °C to +85 °C). Large costly experimental campaigns are therefore necessary identify all behaviour's sensitivities. Yet, time-temperature-superposition ...

An attempt is made to summarize the different ways of modelling the anisotropy of a polycrystalline material. At the single crystal level, the formulation based on Schmid law or viscoplasticity shows clearly the microscopic anisotropy due to the hardening and the orientation changes. It is also shown how viscoplasticity leads to a unique slip system activity irrespectively of the rate sensitivi...