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首页> 外文期刊>Mechanical systems and signal processing >Low-frequency acoustoelastic-based stress state characterization: Theory and experimental validation
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Low-frequency acoustoelastic-based stress state characterization: Theory and experimental validation

机译：基于低频声弹性的应力状态表征：理论和实验验证

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摘要

The acoustoelastic theory has been widely utilized for nondestructive stress measurements in structural components. Most of the currently available techniques operate at the high-frequency, weakly-dispersive portions of the dispersion curves and rely on time-of-flight measurements to quantify the effects of stress state on wave speed. High-frequency elastic waves are known to be less sensitive to the state-of-stress of the structure. As a result of such low sensitivity, calibration at a known stress state is required to compensate for material uncertainties, texture effects, and geometry variations of the structure under test.In this work, a new model-based stress measurement technique is developed. The technique integrates the acoustoelastic theory with numerical optimization and allows the utilization of the highly-stress-sensitive, strongly-dispersive, low-frequency flexural waves for reference-free stress measurements. The technique is experimentally validated on a long, rectangular aluminum beam, where accurate stress measurements have been achieved at low excitation frequencies. For instance, with a 500 Hz excitation signal, the error in the measured state-of-stress is found to be in the order of 1 MPa for the different loading scenarios considered in this study. Experimental results show that the developed technique is capable of measuring the state-of-stress without the need for calibration at a known stress state, which makes it ideal for in-service structures.
机译：声弹理论已被广泛用于结构部件的无损应力测量。大多数当前可用的技术都在色散曲线的高频，弱色散部分工作，并依靠飞行时间测量来量化应力状态对波速的影响。已知高频弹性波对结构的应力状态较不敏感。由于灵敏度低，需要在已知应力状态下进行校准以补偿被测结构的材料不确定性，纹理效应和几何形状变化。在这项工作中，开发了一种基于模型的新应力测量技术。该技术将声弹理论与数值优化相结合，并允许利用高度应力敏感，强分散，低频挠曲波进行无参考应力测量。该技术在长矩形铝梁上经过实验验证，其中在低激励频率下已实现了精确的应力测量。例如，对于500 Hz的激励信号，对于本研究中考虑的不同负载情况，测得的应力状态误差约为1 MPa。实验结果表明，开发的技术能够测量应力状态，而无需在已知应力状态下进行校准，这使其成为在役结构的理想选择。

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