A Cyclic Elastoplastic Constitutive Model Based on Dissipative Plastic Energy

Abstract

In the framework of elastoplastic theory, by introducing dissipative plastic energy (instead of cumulative plastic strain) and dissipative plastic energy rate (instead of cumulative plastic strain rate) into the ratchetting parameter evolution equation and isotropic evolution rules respectively, a cyclic elastoplastic constitutive model based on dissipative plastic energy is established. This model, termed the WDP model, describes the physical meaning and evolution rule of the unclosed stress–strain hysteresis loop using an energy method. A comparison of numerical implementation results with experimental data demonstrates the capability of the WDP model to predict the cyclic deformation of EA4T steel, effectively capturing the cyclic softening characteristics and ratchetting behaviors of axle steel EA4T.