Three dimensional elasto-plastic constitutive law for the description of ratcheting of 316 stainless steel

A constitutive elastic-plastic law with a discrete memory variable, plastic strain at the last unloading and a ratchetting stress as a material parameter is proposed. The essential feature of this law is that it contains no non proportional parameter. However with only uniaxial identification acceptable results are obtained for ratchetting in uniaxial and non proportional cases. Different results are presented for homogeneous isothermal situations or non anisothermal and on homogeneous situations. We compare experimental data, and simulations obtained by the present model, using either uniaxial or non proportional identification and with some other models. (author). 16 refs., 14 figs