A simple fracture and fragmentation model for plastically deforming or melted solids.
Abstract
A simple fracture and fragmentation model for plastically deforming or melted solids is presented for use in finite element calculations. It begins with the mesomechanical DFRACT model for nucleation and growth of microscopic voids. The DFRACT model is supplemented by a fragmentation model that predicts the fragment size distribution. The model is based on the assumption that each void is surrounded by a void-free region which, upon coalescence, becomes a fragment. An additional key assumption is that the local porosity is equal to average porosity. The above two assumptions lead to the result that the fragment size distribution is propotional to the void size distribution at the onset of coalescence. The model does not depend explicitly on strain rate, but for the special case of constant applied strain rate can be compared to strain rate dependent models based on an energy balance approach. Computational results are shown for several stress wave loading cases.
- Publication:
-
APS Northwest Section Meeting Abstracts
- Pub Date:
- May 2003
- Bibcode:
- 2003APS..NWS.B4004C