A Testing Apparatus for Materials Deformed under High Hydrostatic Pressure and with High Deformation Speed

The present paper describes a testing apparatus in which some deformations such as tension and blanking can be given to metals at ambient temperature under hydrostatic pressure up to 700 MPa and with deformation speed up to 1 m·s−1. Using this apparatus, tensile tests of a high purity polycrystalline zinc were carried out in a wide range of deformation speed. The finding of increase in the brittle-to-ductile transition pressure with increasing strain rate is discussed on the basis of rate dependence of fracture stress.