Loading history effect on ratcheting behavior: Modelling and simulation

In this paper, an elastoplastic constitutive model is developed to describe the effect of loading history on the ratcheting. The loading history variable is introduced to record stress history variation during cyclic loading, such as equivalent peak stress and equivalent stress amplitude. Based on Ohno-Wang model, an improved kinematic hardening rule is proposed to simulate the ratcheting effect by establishing the nonlinear evolution equation of ratcheting parameter. A new memory evanescence term is introduced to the plastic strain range memory surface. The evanescence term is activated to describe the difference of yield stress evolution during ratcheting and strain-controlled cyclic loading as the plastic strain range radius exceeds a certain threshold. Compared with the experiments and existing models, the results show that the proposed model can better capture the ratcheting effect with loading history.

Automated summary

In this paper, an elastoplastic constitutive model is proposed to describe the ratcheting effect with loading history. It introduces a loading history variable to record stress history variation during cyclic loading. An improved kinematic hardening rule based on Ohno-Wang model is established to simulate the ratcheting effect. A new memory evanescence term is introduced to capture the difference of yield stress evolution during ratcheting and strain-controlled cyclic loading.