Abstract
A methodology for the determination of parameters for superposed, uncoupled, A-F type nonlinear kinematic hardening rules is presented for reversed cyclic plasticity or viscoplasticity. The important aspects of the procedure are presented for general reversed proportional cycling and then special cases of axial-torsional and uniaxial loadings are considered along with several experimental examples. The approach yields a quantitative estimate of the saturation state of stress for these types of models, directly from experimental responses to reversed proportional cycling. Iterations are not required to obtain parameter estimates, except for the numerical solution to a set of nonlinear algebraic equations when more than two A-F type rules are superposed to model backstress evolution.
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