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Study on Damage Mechanism of Pipe using Ultrasonic Wave and Acoustic Emission Technique

机译：超声波与声发射技术研究管道损伤机理

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摘要

A study on corrosion evaluation by using ultrasonic waves and acoustic emission technique is presented. The experimental equipment was established to improve the corrosion process of carbon steel pipe. The carbon steel pipe was under 473K temperatures and 10Mpa pressure conditions, and ultrasonic wave and acoustic emission techniques were used to inspect the degree of corrosion after a certain period of time. Ultrasonic bulk waves are limited by the poor time resolution when used in the measurement of corrosion depth in thin wall structures because the corroded surfaces cause unclear echo signal edges. Therefore, in this study, the ultrasonic guided waves were generated on the pipe because the thickness of pipe was thin. Various wave modes were subsequently generated on the pipe to evaluate the implications of corrosion thinning on group velocity, transmission and reflection amplitudes. The amplitudes of the transmitted and the reflected waves are influenced by couplent material. In order to reduce the effect of coupling acoustic emission sensor was used. Acoustic emission technique has lots of parameters to evaluate the corrosion besides amplitude parameter. Among parameters energy, count, and frequency were useful parameters to measure the degree of corrosion inside the carbon steel pipe under 473K temperatures.
机译：提出了利用超声波和声发射技术进行腐蚀评价的研究。建立了改善碳钢管腐蚀过程的实验设备。碳钢管在473K温度和10Mpa压力条件下工作，并使用超声波和声发射技术检查一定时间后的腐蚀程度。当用于薄壁结构腐蚀深度的测量时，超声波体波受到时间分辨率的限制，因为腐蚀的表面会导致回波信号边缘不清楚。因此，在本研究中，由于管道的厚度较薄，因此在管道上产生了超声波导波。随后在管道上产生了各种波模，以评估腐蚀稀化对群速度，透射率和反射幅度的影响。透射波和反射波的幅度受耦合材料的影响。为了减少耦合的影响，使用了声发射传感器。声发射技术除了振幅参数外，还有许多用于评估腐蚀的参数。在能量，数量和频率等参数中，有用的参数可用于测量473K温度下碳钢管内部的腐蚀程度。

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