박판금속의 단열 전단밴드 생성에 관한 실험

Abstract

The adiabatic shear band formation is one of the high speed deformation phenomena, in which adiabatic shear failure is physically observed as a narrow band of the continuous shear strain. In this paper, the experiment of the formation of the adiabatic shear band in sheet metal is carried out for high strength steel sheet, 60C and 60TRIP. In order to carry out experiments with a tension split Hopkinson bar, shear specimens are designed to induce large shear strains. The shear deformation of the two sheet metals of 60TRIP and 60C is quite different and the adiabatic shear band is observed with 60C only. The width of a shear band is measured by comparison of the hardness in a crack tip. The shear deformation in 60TRIP is restrained and the crack is propagated by a tensile mode since the strain hardening of 60TRIP in the high strain rate is large. The load-displacement curves show that the load with 60TRIP becomes higher than that with 60C as the displacement increases.