EXPERIMENTAL RESEARCH ON POISSON'S RATIOS OF 460 MEGAPASCAL HEAT-RESISTING STEEL AT HIGH TEMPERATURE

In order to measure Poisson's ratios for 460 MPa heat-resisting steel at high temperature, tension and torsion tests for 460 MPa heat-resisting steel at room temperature and high temperatures of 100 to 600℃ were completed on the MTS809 material testing machine. The elastic modulus and shear modulus of the material at different temperatures were measured with using high temperature tension-torsion extensometers. According to the relations between Poisson's ratio and the elastic formation modulus Poisson's ratios of steel at high temperatures were calculated. Poisson's ratios of 460 MPa heat-resisting steel at room temperature were 0.322 measured with radial and axial extensometers, while Poisson's ratios at room temperature were 0.335 measured and calculated in tension and torsion tests,and the error was 4%, which verificed the feasibility of Poisson's ratios measured in tension and torsion tests at high temperature.