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    考虑温度影响的横波双折射法超声应力测量技术

    Ultrasonic stress measurement technique based on shear wave birefringence considering temperature effects

    • 摘要: 针对基于横波双折射法的应力检测精度受温度影响大的问题,提出了一种考虑温度影响的横波双折射法超声应力测量技术。首先基于声弹性效应,理论推导了包含温度修正项的横波双折射法应力计算模型,引入温度修正系数对超声传播时间进行修正。再基于拉伸标定试验,标定了6061铝合金的应力系数和温度修正系数,并在不同温度下验证了所提方法的测量精度。试验结果表明,在变温环境下,所提方法的应力检测误差在2.29%~10.82%范围内,高应力区(50~90 MPa)测试误差降低至3.5%以内,测量精度较未修正方法精度提高约13%。

       

      Abstract: Addressing the problem that the stress detection accuracy based on the shear wave birefringence method is greatly affected by temperature, a shear wave birefringence ultrasonic stress measurement technique considering temperature influence was proposed. First, based on the acoustoelastic effect, a stress calculation model for the shear wave birefringence method including a temperature correction term was theoretically derived, and a temperature correction coefficient was introduced to correct the ultrasonic propagation time. Then, based on tensile calibration tests, the stress coefficient and temperature correction coefficient for 6061 aluminum alloy were calibrated, and the measurement accuracy of the proposed method was verified at different temperatures. The experimental results showed that in a variable temperature environment, the stress detection error of the proposed method ranged from 2.29% to 10.82%, with test errors in the high stress region (50-90 MPa) reduced to within 3.5%, and measurement accuracy improved by approximately 13% compared to the uncorrected method.

       

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