An investigation of the cyclic plasticity constitutive model for 304 type stainless steel; Evaluation of the nonlinear cyclic hardening model using nonhardening strain region

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A constitutive model which can express material behavior accurately is needed to perform inelastic analysis with high precision. The nonlinear cyclic hardening model using nonhardening strain region developed by Ohno and his co-workers, is worthy of notice becase it can express fundamental aspects of cyclic plasticity behavior of 304 type stainless steel. The prupose of this report is to evaluate their model through the determination of model constants and inelastic structural analyses for plactical problems. The following results were obtained. (1)The determination procedure of model constants was proposed,and its computer program was developed. Then the model constants for 304 type stainless steel was decided from experimental data obtained at PNC, (2)For uniaxial and constant strain rangc cyclic problem, this model agrce well with the experimental result under isothermal condition. (3)Analysis for the notched bar under cyclic loading and the straight pipe under cyclic thermal transients were performed by using the present constitutive model implemented in FINAS. It can be said that this model is applicable to the pracrical structural analysis under cyclic loadings. (4)It was shown that further investigation should be required for this model to improve the precision, under temperature changing condition and multiaxial problem.