Application of magnetostriction guided waves in the bolt detection

HE Ming1, TANG Zhifeng2, XIANG Zhanqin3, WANG Fei3
(1. Transport Police Corps, Zhejiang Province Public Security, Hangzhou 310009, China;
2. Institute of Advanced Digital Technologies and Instrumentation, Zhejiang University, Hangzhou 310027, China;
3. Institute of Modern Manufacture Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract: Aiming at realizing efficient detecting of the length and defects of buried bolts, a new nondestructive testing method based on magnetostriction and guided waves was proposed. On the basis of studying the longitudinal guided waves model in the bolts, dispersion curves of guided waves in 20 mm diameter bolt were calculated. Then an experimental system was built, bolts in the air and soil were detected by the system. The results indicate that this method can be used to detect the length and defects of free or buried bolt with characteristics of high detection accuracy and simple testing process. It can be used in the actual bolt testing work.
Key words: guided waves; magnetostriction; nondestructive inspection