Unified modelling of cyclic viscoplasticity: Application to austenitic stainless steels

Abstract The great number of experiments performed at small plastic strain on austenitic stainless steels have revealed a complex behaviour either under monotonic or under cyclic loadings. In particular, at increased temperatures, microstructural changes lead to either aging or recovery according to the loading situations. The main features of the behaviour are taken into account in the unified model developed and used at ONERA. In the first part, the set of constitutive equations is described and justified on the basis of experimental results. The capabilities of the model are then checked against the example of type 316 L stainless steel at 600°C. Model predictions show a general agreement with experimental data for monotronic and cyclic conditions on these particular materials, and reproduce both the fast plastic loadings and the long time creep loadings.

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