Description of nonproportional cyclic ratchetting behavior

The nonlinear dynamic recovery modification of the Armstrong Frederick rule recently proposed by Ohno and Wang is considered. Several important criteria are discussed for models capable of representing stress state and amplitude dependence of ratchetting behavior. Experimental results obtained on a carbon rail steel subjected to various uniaxial and nonproportional loading conditions are presented and correlated with an extensiion of the Ohno and Wang model which accounts for a broader range of stress state and amplitude effects