Multiaxial creep models for 304 stainless steel
Two viscoplastic constitutive equations were developed to describe creep strain of 304 stainless steel at 593 [degrees] C (1100 [degrees] F) under variable stresses of pure tension, pure torsion and combined tension and torsion. One was based on isotropic strain hardening concept and the other employed a state variable (kinematic strain hardening). The creep equations and the constants were determined from constant stress creep test data. The stress dependence of time dependent creep component was best described by a hyperbolic sine function of the maximum shear stress above a transition point and a linear relation below it. Comparing theoretical calculations with experimental data, the constitutive equations gave reasonable predictions of the material responses.
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