Abstract
In this paper, how to improve both anti-loosening and fatigue strength with low cost is newly proposed for bolt-nut connection. The authors’ previous study clarified that the most suitable pitch difference α=α1 for the fatigue strength is smaller than the most suitable pitch difference α=α2 for the anti-loosening. In this paper, toward improving both fatigue strength and anti-loosening, a larger nut height coupled with pitch difference is studied through experiment and FEM analysis. It is found that with increasing the nut height, the suitable pitch difference for the anti-loosening α=α3 decreases without changing the suitable pitch difference for the fatigue strength. Therefore, a larger nut height with the pitch difference α=α3≈α1<α2is suitable for improving both fatigue strength and anti-loosening.
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