Towards Statistical Representation of Dynamic Porosity-Based Ductile Damage

An overview of two main features of the thermodynamically consistent model for the nucleation and growth of voids under dynamic loading conditions is presented. Voids are modelled as thick-walled spheres within a representative volume element (RVE). The statistical distribution of dominant material defect void nucleation resistance and local stress state variation within the RVE are given by a probability density function (PDF) informed by molecular dynamics data and polycrystal calculations. The PDF specifies the interaction between the spatially varying stress state and the dominant class of material defect and serves to bridge the microscale problem to the RVE macroscale. Energy is assigned to defect and thermal physical subsystems accounting for free surface creation with void radii evolving according to a local power balance with an evaluation of the stress power term performed via unit cell calculations. A summary of the model is presented as well.