Characterisation and modelling of short fibre reinforced polymers for numerical simulation of a crash

Abstract

To save costs, an early validation of functionality is necessary for the crash application of short fibre reinforced polymers by numerical simulation. For this an experimental determination of mechanical values and a numerical material model is essential. In this work the mechanical values of a short fibre reinforced polymer were determined at varied strain rates and in different directions under compression, shear and tension loading. With data of this experiments a new orthotropic-linear elastic and both orthotropic and strain rate dependent plastic material model is developed. It considers the hydrostatic pressure dependency of the hardening material and a failure which is influenced by directions, strain rates und multiaxial states of stresses. The validation of material model and characteristic mechanical values is conducted by simulations of determining experiments of the material behaviour as well as at dynamic impact tests.

Keywords:

• crashworthiness simulation
• strain rate dependency
• short fibre reinforced polymer
• material model
• material characterisation