Application and Assessment of Bonora Damage Model for Geometry Transferability, Mesh Sensitivity and Plasticity Effects using MSC Marc 2014-28-0029
A new damage model based on the Continuum Damage Model [Ref. 1] has been implemented in MSC Marc. It can simulate three process of damage evolution namely: void generation, growth and coalescence. By deactivating the element when a certain damage value is reached, users can now simulate a whole range of damage process; from micro crack to macro crack growth.
Micromechanical models like continuum damage mechanics (CDM) deal damage and failures as characteristics based on material and not as geometry configuration. These models are analyzed and validated only for simple geometrical configurations like uniaxial tensile bar, rotating beam specimen etc. A detailed assessment of the geometry transferability, mesh sensitivity and plasticity effects has been addressed only in a limited number of works.
In this paper, CDM approach, as proposed by Bonora is used to model and verify ductile damage processes for various stress states (triaxiality), and mesh sizes, thus validating its use across various models used in industries. Some preliminary results comparing MSC Marc results with experimental data are also discussed.