Masao Nishihara

Tri-Axial Tests of Metallic Materials at Elevated Temperatures

For the study of the effects of hydrostatic pressure and temperature on mechanical behaviour of metallic materials, a high-temperature tri-axial testing machine was designed and constructed. By using this machine, it is made possible to carry out tension or compression tests at elevated temperatures up to 600°C under hydrostatic pressures up to 5000kg/cm2.The results of tension tests on carbon steel (0.14%C) and titanium show that the strength of both materials increases with hydrostatic pressure within the range of the tests (room temperature to 500°C, atmospheric pressure to 5000kg/cm2). The effect of hydrostatic pressure on the ductility of titanium is remarkable over the whole range of test temperature. On the other hand, the effect on the ductility of carbon steel is positive up to the temperature of about 300°C, but the effect on elongation decreases beyond that temperature and the effect on reduction in area becomes negative.