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首页> 外文期刊>The Journal of Strain Analysis for Engineering Design >A comparison of the use of critically refracted longitudinal waves and magnetic Barkhausen noise for stress measurement in API 5L X70 steel
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A comparison of the use of critically refracted longitudinal waves and magnetic Barkhausen noise for stress measurement in API 5L X70 steel

机译：API 5L X70钢中使用临界折射纵向波和巴克豪森磁噪声进行应力测量的比较

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摘要

According to acoustoelastic theory, ultrasonic wave velocity varies as a function of the state of stress in a body. In ferromagnetic materials, stress alters magnetic domain walls created by cyclic magnetic excitation and affects the amplitude of magnetic Barkhausen noise signals. In this work, both these properties are used to measure different levels of stress in specimens of API 5L X70 steel. Time of flight of ultrasonic critically refracted longitudinal (L-cr) waves and magnetic Barkhausen noise are measured and compared using three parameters: sensitivity, linearity, and dispersion. The results show that while magnetic Barkhausen noise is much more sensitive to variations in stress, the time of flight values fit a linear curve better. Also, for the ultrasonic technique, dispersion between the curves for the different specimens is lower. For both techniques, measurement dispersion in the specimens when no stress is applied is high. The findings of this study can be used to indicate the limits within which each technique can be used and to help decide when it is more appropriate to use one technique rather than the other.
机译：根据声弹理论，超声波速度根据人体中的应力状态而变化。在铁磁材料中，应力会改变由循环磁激励产生的磁畴壁，并影响巴克豪森磁噪声信号的幅度。在这项工作中，这两种特性均用于测量API 5L X70钢样品中的不同应力水平。超声临界折射纵向（L-cr）波的传播时间和巴克豪森磁性噪声的测量时间使用三个参数进行比较：灵敏度，线性和色散。结果表明，尽管巴克豪森磁性噪声对应力变化更为敏感，但飞行时间值更适合线性曲线。同样，对于超声波技术，不同样本的曲线之间的离散度较低。对于这两种技术，在不施加应力的情况下，样品中的测量色散很高。这项研究的发现可以用来表明每种技术可以使用的限制，并有助于确定何时更适合使用一种技术而不是另一种技术。

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