The anti-loosing performance and the reduction of stress concentration of bolts and nuts which have slight pitch difference

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In this paper, to improve anti-loosing performance and fatigue strength of the bolts and nuts, the loosening and fatigue experiments are performed with varying the pitch difference. Then, the most desirable conditions for the anti-loosing performance and fatigue strength of the pitch difference are discussed. To improve anti-loosing performance, the most desirable pitch difference is alpha=alpha-middle. To improve fatigue life,the most desirable pitch difference is alpha=alpha-small. Although, the fatigue limit is not improved. In the both case, the finite element method is applied to simulate the loosening and fatigue experiment. Finally, the effect of the large notch root radius is discussed by using FEM. It is found that, the fatigue strength of large notch root radius bolts and nuts is improved.