Development of a Damage-dependent Modified Material Model for Enhanced Description of Transient Material Behavior

The growing popularity of electromobility is opening up new fields of application for various materials. For example, the aluminum alloy EN AW-1050A H24 is now of greater interest due to its good conductive properties. As a result, the material behavior of EN AW-1050A H24 must be accurately understood and described to properly assess fatigue life. To describe the cyclic material behavior of EN AW-1050A H24 special consideration should be given to the non-stabilizing cyclic softening. That leads to a significant mismatch of the experimental and simulated hysteresis loops using the Chaboche combined hardening model. In this study a new, Damage-dependent Modified Material Model is developed to fix this mismatch by calibrating the kinematic hardening parameters on experimental data in dependence to damage. As a result, the simulated hysteresis loops can precisely map the experimentally determined cyclic material behavior even without cyclic stabilization.