A Cyclic Damaged Plasticity Model: Implementation and Applications

In analysis and design of structures subjected to earthquakes, the cyclic and dynamic nature of the response leads to complications. Material models need to account for cyclic plasticity, including deterioration and eventual failure due to low-cycle fatigue. A cyclic damage plasticity model MAT_DAMAGE_3 (MAT_153, LSTC 2007) is implemented to combine Armstrong-Frederick/Chaboche nonlinear kinematic hardening, isotropic hardening, and Lemaitre isotropic damage evolution based on continuum damage mechanics. By appropriately choosing parameters, this model can reproduce an approximation to the widely-accepted Manson-Coffin low-cycle fatigue rule without of cycle counting. This makes it possible to model the decrease in the material’s ability to deform inelastically. The material model is applied to assess the behavior of a steel structure subjected to deterioration and failure.