B08 Analysis of torsional behaviour of metal under a compressive hydrostatic pressure

Abstract

It is known that the yield stress and ductility of many kinds of metals increase under a high compressive hydrostatic pressure. A part of the authors have developed a cutting tool equipped with a jig for locally supplying a hydrostatic pressure in the vicinity of cutting point to reduce the plastic deformation, and it is proved that such a cutting tool is advantageous to reduce burr formation. In this report, a molecular dynamics simulation of torsion process of aluminum was performed in order to clarify the reduction mechanism of plastic deformation under such a relatively high compressive pressure. As a result, it is clarified that the modulus of rigidity and critical shear stress are increased irrespective of the presence of pore defect.