Polymer behaviour and fracture models in dynamic
1 Univ. Lille Nord de France, 59000 Lille, France
2 UVHC, LAMIH, 59313 Valenciennes, France
3 CNRS, UNR 8201, 59313 Valenciennes, France
4 TOYOTA MOTOR EUROPE, 1140 Brussels, Belgium
a e-mail: email@example.com
A phenomenological small strain model is developed to capture the elastoviscoplastic behaviour of a 20% filled polypropylene. The constitutive model is based on a multiplicative viscoplastic law. The hydrostatic pressure dependency is considered by using the Drucker Prager yield surface. A phenomenological damage model characterised directly by experimental investigation is used to capture the yield degradation during the deformation in tension. The volume variation due to the cavitation phenomenon is captured by using non-associated viscoplasticity. Some experimental tests at different speed loadings are carried out for the parameters identification of the constitutive model. Furthermore, a fracture model which depends on the stress triaxiality and the strain rate is developed in order to model the complete behaviour of the material studied until fracture.
© Owned by the authors, published by EDP Sciences, 2012