超音波の音速に及ぼす応力と温度の効果

概要

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The effects of stress and temperature on ultrasonic velocities are studied experimentally in order to establish the acoustoelastic law applicable to thermoelastic stress analysis. A specimen for uni-axial tensile test is prepared from a rolled plate of S45C, and the sing-around method is used to measure the round-trip time of ultrasonic waves incident normally to the specimen. Since Salama et al. proposed a non-destructive method for measuring residual stresses based on the stress-dependence of velocity change due to temperature, particular attention is paid to this effect, and two kinds of experiment are carried out to confirm it quantitatively. At first, velocities of longitudinal and transverse waves are measured by varying the temperature under several constant uni-axial stresses, and it is confirmed that the velocity change due to temperature depends linearly on stress. Then the velocities of three waves are measured by varying uni-axial stress under several constant temperatures, and the velocity change due to stress is shown to be linearly dependent on temperature. From both results, the stress-temperature coefficients of velocities are determined together with the acousto-elastic constants and temperature coefficients of velocities, and are compared with those obtained by Salama et al.
一般社団法人日本機械学会の論文
1988-02-25