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首页> 外文期刊>Experimental Mechanics >The Potential of Ultrasonic Non-Destructive Measurement of Residual Stresses by Modal Frequency Spacing using Leaky Lamb Waves
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The Potential of Ultrasonic Non-Destructive Measurement of Residual Stresses by Modal Frequency Spacing using Leaky Lamb Waves

机译：使用泄漏兰姆波通过模态频率间隔进行超声波无损测量残余应力的潜力

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This paper investigates the potential of ultrasonic non-destructive measurements of residual stresses using the modal frequency spacing method based on the interference spectrum of leaky Lamb waves as an alternative to the commonly used flight-time approach in ultrasonic methods. Extensive experiments were carried out to verify the viability and robustness of the technique using an instrumented leaky Lamb wave setup with uniaxial stressed samples and welded steel samples. To improve the signal-to-noise ratio, multiple sets of raw signals of specularly reflected and leaky Lamb waves were acquired and then averaged in the time domain. The acquired data in the time domain were then transformed into the frequency domain to form the interference spectrum of leaky Lamb waves with a good repeatability. The acoustoelastic coefficient of carbon steel is then derived from the measured relationship of wave velocity and applied stress. Finally, a welded steel plate was examined and residual stress was evaluated. The current work demonstrates the feasibility and the potential of the proposed method in measuring residual stresses in welded plates and thin-walled structures.
机译：本文研究基于泄漏兰姆波干扰谱的模态频率间隔法，作为超声方法中常用的飞行时间方法的替代方法，利用模态频率间隔法研究残余应力的超声无损测量方法的潜力。进行了广泛的实验以验证使用单轴应力样品和焊接钢样品的仪器化泄漏兰姆波装置的技术的可行性和鲁棒性。为了提高信噪比，获取了多组镜面反射和泄漏兰姆波原始信号，然后在时域中进行平均。然后将时域中获取的数据转换到频域中，以形成具有良好重复性的泄漏兰姆波的干涉谱。然后从波速和施加应力的测量关系中得出碳钢的声弹系数。最后，检查了焊接钢板并评估了残余应力。当前的工作证明了该方法在测量焊接板和薄壁结构中的残余应力方面的可行性和潜力。

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