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声弹性应力分析的根据是,材料在应力作用下,由起初的各向同性变成各向异性。这样偏振超声剪切波产生的双折射效应,就会和利用一束光波和一块透明模型试样所产生的光弹效应相类似。本文中用一个5千赫兹剪切型发射器通过声循环法直接测量垂直偏振声波的声速差。用该方法测量了带有同心补焊接头的碳钢圆板中的残余应力分布。声弹性系数,分别用基材的单轴向试验获得。实验结果表明,以无损方式进行的声应力测量的结果,与由常规的破损法获得的结果以及与理论予计值相当吻合。
Acoustic elastic stress analysis is based on the material under the action of stress, from the initial isotropic anisotropy. The birefringent effect of such a polarized ultrasonic shear wave is similar to the photoelastic effect produced by using a light wave and a transparent model specimen. In this paper, a 5 kHz shear-type transmitter is used to directly measure the sound velocity difference of vertically polarized sound waves by the acoustic cycle method. This method was used to measure the residual stress distribution in a carbon steel disk with a concentric weld joint. Acoustic elastic coefficient, respectively, with the uniaxial substrate test obtained. The experimental results show that the results of acoustic stress measurements performed in a non-destructive manner are in good agreement with the results obtained by conventional methods of breakage and theoretical predictions.