Acoustic emission characteristics of stress corrosion of high strength bolts
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摘要: 高强螺栓是钢结构的重要连接构件，其在高应力服役过程中易因锈蚀而出现断裂。为了研究其在应力锈蚀下的损伤演化规律，利用声发射技术对其损伤过程进行了实时监测。结合改进的K均值算法和动态门槛，对声发射损伤信号进行聚类，并进一步对聚类的声发射信号进行锈蚀损伤阶段划分。试验结果表明，高强螺栓的损伤信号可以分为3类，进一步划分其中第三类信号的损伤阶段，最终得到应力锈蚀的4个阶段，验证了提出的声发射方法的有效性，并可使用该声发射方法实时监测高强螺栓的健康状况。Abstract: High strength bolts are important connecting components of steel structures, and they are prone to fracture due to corrosion during high stress service. In order to study its damage evolution law under stress corrosion, real-time monitoring of its damage process was carried out using acoustic emission technology. Combining the improved K-means algorithm and the dynamic threshold, the acoustic emission damage signals were clustered, and the clustered acoustic emission signals are further divided into rust damage stages. The test results show that the damage signals of high strength bolts can be divided into three categories, and the damage stage of the third category of signals is further divided, and finally four stages of stress corrosion are obtained. The test verified the effectiveness of the proposed acoustic emission method, and the acoustic emission method can be used to monitor the health of high-strength bolts in real time.
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Keywords:
- high strength bolt /
- stress corrosion /
- acoustic emission /
- K-means clustering
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