Fatigue crack propagation monitoring of stainless steel using fiber Bragg grating ultrasound sensors
Fatigue crack propagation monitoring of stainless steel using fiber Bragg grating ultrasound sensors
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DOI：
10.1088/0964-1726/15/5/032
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发表时间：
2006-10-01
影响因子：
4.1
通讯作者：
Guan, Yisheng
中科院分区：
文献类型：
--
作者：
Tsuda, Hiroshi;Lee, Jung-Ryul;Guan, Yisheng
采用由压电变送器和光纤光栅（FBG）传感器组成的超声检测系统对不锈钢疲劳裂纹扩展进行了监测。疲劳裂纹沿连接在试样表面的变送器和传感器的连接线垂直发展。记录了裂纹张开和闭合时不同疲劳裂纹长度的超声响应信号。为了研究超声波形对超声变送器响应特性的影响，在200 ~ 800khz范围内，采用脉冲信号和正弦脉冲信号作为激励信号驱动超声变送器。裂纹通过连接变送器和传感器的线路后，响应信号随裂纹扩展而稳定延迟，但裂纹闭合时的延迟小于裂纹打开时的延迟。在裂纹闭合过程中，采用800 kHz的最高频率脉冲信号激励超声，裂纹闭合后的响应存在明显的裂纹扩展响应延迟。实验证明，基于fbg的超声检测系统可以有效地监测疲劳裂纹的扩展，即使裂纹闭合。
Fatigue crack propagation of stainless steel was monitored using an ultrasonic inspection system consisting of a piezoelectric transmitter and a fiber Bragg grating (FBG) sensor. The fatigue crack developed perpendicularly to the line connecting the transmitter and the sensor, which were attached on the surface of the test specimen. The ultrasonic response signal was recorded at several fatigue crack lengths either in crack opening or in crack closure. In order to examine the influence of ultrasonic waveform on response behavior, the ultrasonic transmitter was driven by several kinds of excitation signal: a spike signal and a sinusoidal toneburst signal, whose frequency ranged from 200 to 800 kHz. The response signal delayed steadily with crack growth after the crack passed through the line connecting the transmitter and the sensor, although the delay in crack closure was smaller than that in crack opening. In crack closure, a significant response delay with crack growth was observed in the latter response to ultrasound excited by a 800 kHz toneburst signal, which was the highest frequency signal applied in the present study. The FBG-based ultrasonic inspection system proved to be effective for monitoring fatigue crack propagation even in crack closure.