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86 ©2023 ANSYS, Inc. Initial Back Stress for Kinematic Hardening Material Models Features Models Comments • The yield center is shifted by the initial back stress • Input initial back stress: INIS,SET, DTYP, BSTR INIS,DEFINE,,,,,Sxx,Syy,Szz,Sxy,Sxz,Syz or INIS,READ,'xxx','ist',, • Output current back stress: INIS,WRITE, , , , , ,BSTR • For plane stress problem, both input and output are based on mapping and deviatoric regularized form BKIN - Bilinear Kinematic Hardening • The back stress is a function of the plastic strain, which is an independent history variable CHAB – Chaboche Nonlinear Kinematic Hardening • Can be applied to multiple branches of sub-chains • The back stress and plastic strain are independent history variables total strain stress =−12 plastic strain stress =−12 =0 =0