Formation and Propagation of Shock Waves in Highly Porous Materials

The existence issue of shock waves during dynamic deformation of plastic porous materials is analyzed. The analysis is based on the mechanics of plasticity for porous continuum. The deformation routes typical for both the use of shock resistant materials and dynamic compaction of powders and porous bodies are considered. It is established, that unlike compacts, the deformation of porous bodies can be accompanied by shock waves. For the routes where the changes in volume dominate over the changes in shape, the deformation is always accompanied by the formation of shock waves. Meanwhile, in case of free deposition (and similar routes), shock waves appear only if the starting porosity is high.