2012•The Proceedings of the Materials and Mechanics ConferenceOpen access
OS1210 Fatigue Strength Analysis for Bolts and Nuts Which Have Slightly Different Pitches Considering Clearance
Yu-Ichiro Akaishi, Yang Yu, Xin Chen, Huan Wang, Hidetoshi TAMASAKI, N. Noda, Yoshikazu Sano, Yasushi TAKASE
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Abstract
The bolts and nuts are widely used in various fields as an important joining machine element. It is known that failures usually happen at the root of the first bolt thread where the maximum stress concentration occurs. In this paper, a special nut whose pitch is slightly larger than the one of the bolt is studied by applying the finite element method. Then it is found that these special bolt and nut reduce the stress concentration at the first root of the bolt thread effectively because the contact condition different from the normal bolt and nut. The reduction of the stress concentration is also confirmed under dynamic bolt axial forces. The experiments results show that the fatigue strength can be improved under slightly different pitches in accordance with the FEM analysis.
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