LOCALIZATION OF DEFORMATION IN COLLAPSE OF A THICK-WALLED CYLINDER

The thick walled cylinder method is used to study the character of pla stic deformation localization (PDL) in materials with various crystall ine lattice structures, defect packing energy, and grain size. It is s hown that the development of the localization process leads to restruc turing of the medium during collapse. The character of this restructur ing, determined by the type of PDL bands and crack formation, depends to a large degree upon grain size. It is shown that the restructuring of fine-grained copper and Teflon is similar. In the copper developmen t of microstructure with increased deformation rate was observed.