CYCLIC VISCOPLASTIC CONSTITUTIVE-EQUATIONS .2. STORED ENERGY COMPARISON BETWEEN MODELS AND EXPERIMENTS

The cyclic constitutive equations developed at ONERA have been incorpo rated into a general thermodynamic framework (Part I). In the present part, systematic comparisons are given between the model predictions a nd experimental data for both the mechanical response and the energy s tored in the material. The models are specified in their rate-independ ent-form and closed-form solutions are obtained for tension-compressio n monotonic and cyclic conditions. By superposing one or two nonlinear kinematic rules and one isotropic hardening equation, the available e xperimental data are fairly well reproduced. In particular it is possi ble to describe the low values of stored energy, the decrease of the r atio of stored energy to total plastic work as a function of strain, a nd the partial release of stored energy at every half cycle of a cycli c loading.