Model for 28CrMoV5-8 steel undergoing thermomechanical cyclic loadings

anisothermal elastoviscoplastic three-dimensional model is proposed in order to predict the response of brake discs used in the French T.G.V. (high speed train). The brake disc is subjected simultaneously to mechanical and thermal cyclic loadings by the application of brake pads to the friction surface. This anisothermal law is based on the internal thermodynamic variables and takes into account the non-linear kinematic hardening, isotropic hardening (to describe cyclic softening) and plastic strain memory effect. Cyclic viscoplastic behavior under in-phase changes of temperature and strain is analysed by using this elaborate anisothermal model with its material constants determined from isothermal experiments. Good agreement is obtained between the predictions and experiments. 0 1997 Published by Elsevier Science Ltd.