Abstract
In the automobile industry, the simple inspection method of detecting the slack of the high-tension bolt in the engine section is desired. Since the permeability of the compression direction inside the steel is decreased when the steel material is compressed, the permeability of the compressed domain in the bolt is decreased when the fastened force of the bolt is increased. Therefore, the evaluation of the slack of the bolt is possible by detecting the difference of the magnetic characteristics near the compressed position in the bolt. However, the detection signal is also influenced by the change of distance (lift-off) between the bolt and an electromagnetic sensor. In this paper, the inspection method for measuring the slack of the bolt taking account of the lift-off is proposed using the 3-D edge-based hexahedral nonlinear finite element method and the experimental verification.
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