An Investigation of Inhomogeneous Inelastic Deformations through Plate Impact Recovery Experiments and Mathematical Modelling of Propagating Localized Deformations

摘要

A high strain rate, pressure-shear experiment has been developed in which a thin specimen attached to an elastic anvil plate is impacted by an elastic flyer plate that is inclined to the direction of approach. This experiment can be used to obtain the plastic response of metals at strain rates of 10 to the 5th power s-1 and pressures of 2-8 GPa. Experimental results for 1100-0 aluminum, 6061-T6 aluminum and OFHC copper show the flow stress at strain rates of 10 to the 5th power s to the -1 power to be much higher than at strain rates of 10 to the 3 power s to the -1 power. For 1100-0 aluminum the effect of hydrostatic pressure on the flow stress has been examined by varying the angle of impact in order to change the ratio of the pressure to the shear stress. No signficant pressure effect has been observed. (Author)