Study analyzes the keys to fragmentation of metallic materials
(PHYSorg.com Chemistry)

Scientists have analyzed the mechanisms behind the dynamic fragmentation of ductile metallic materials that exhibit large permanent deformations when subjected to severe mechanical loading. Previously, it was thought that dynamic fragmentation was triggered by the inherent defects of the material. What this research suggests is that the key mechanism may not be the porosity of the metallic material, but inertia effects.