Ratchetting Phenomenon at Low Strain Rates for AISI
This chapter deals with 3D viscoplastic strain of a rectangular block made of AISI 316H austenitic stainless steel. One of its sides is loaded by constant normal stress whereas two lateral side surfaces are acted upon by harmonically variable shear stress. It is experimentally observed that such temporal variation induces progressive but saturated increase of axial strain in the direction of tension stress components. The strain rate is of the order of 0. 001 s-1. The problem is treated by two constitutive models: a) Perzyna–Chaboche’s model with incorporated evolution equations for back stress and equivalent flow stress (its eight material constants are taken from [Ele91]) and b) the model explained in [Mic96a], based on tensor representations where plastic stretching is second-order polynomial in stress and linear in plastic strain (having six material constants). Comparison with experiments has shown superiority of the second model.
KeywordsPlastic Strain Austenitic Stainless Steel Plastic Strain Rate Back Stress Tensor Representation
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