UNITED STATES STEEL CORP MONROEVILLE PA RESEARCH LAB
The stress-strain response of crystalline high density polyethylene and of amorphous polycarbonate has been determined in tension and in compression at superimposed pressures up to 1104 MPa 160 ksi. All tests were conducted at room temperature and at a single imposed strain rate, and the specimens were coated with silicone rubber to protect them from the pressurizing fluid. Strain softening occurred in the polycarbonate at low pressures but was inhibited by pressure. Tensile necking occurred in both materials, but was promoted by pressure in polyethylene and inhibited in polycarbonate.