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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >IN-SITU SURFACE ACOUSTIC WAVE MONITORING OE FATIGUE CRACK INITIATION AND PROPAGATION
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IN-SITU SURFACE ACOUSTIC WAVE MONITORING OE FATIGUE CRACK INITIATION AND PROPAGATION

机译：原位表面声波监测OE疲劳裂纹的萌生和传播

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摘要

In this paper an experimental approach for the detection and monitoring of in-situ fatigue crack initiation and growth from the surface corrosion pitting has been developed. An ultrasonic surface wave has been used continuously during fatigue cycling to determine the geometric parameters of the crack. The crack initiation at about 20,000 cycles was systematically recorded for the samples and validated by fractography. From the change of the plate bottom reflection at 60,000 cycles, it was found that at this number of cycles the crack depth is almost equal to the depth of the pit. At 125,000 cycles the surface wave resonance is observed indicating that the depth of the crack is a half wave length. The crack closure/opening load which is critical to fatigue analysis was also determined and monitored quantitatively. It was shown that the crack opening load decreases as the number of cycles increases.
机译：本文提出了一种检测和监测表面腐蚀点引起的疲劳裂纹萌生和生长的实验方法。在疲劳循环过程中，连续使用超声波表面波来确定裂纹的几何参数。系统记录了大约20,000个循环的裂纹萌生，并通过分形法进行了验证。从60,000次循环的板底部反射变化可以发现，在此循环数下，裂纹深度几乎等于凹坑的深度。在125,000次循环中，观察到表面波共振，表明裂纹深度为一半波长。对疲劳分析至关重要的裂纹闭合/打开载荷也已确定并进行了定量监控。结果表明，开裂载荷随着循环次数的增加而降低。

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