Evaluation of the Method for Lowering Stress Concentration at the Thread Root of Bolted Joints With Modifications of Nut Shape
Evaluation of the Method for Lowering Stress Concentration at the Thread Root of Bolted Joints With Modifications of Nut Shape
复制标题
改进螺母形状降低螺栓接头螺纹根部应力集中方法的评价
DOI：
10.1115/1.2842262
复制
发表时间：
1997
影响因子：
1
通讯作者：
T. Fukuoka
中科院分区：
文献类型：
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作者：
T. Fukuoka
许多研究都致力于探讨如何最大应力发生在螺栓连接可以减少。Patterson和Kenny建议，在轴承表面带有直斜面的改良螺母是有效的。然而，他们只处理M30，对螺母几何形状的估计不一定足够。在这项研究中，提出了一种广泛的有限元方法来解决一般的多体接触问题，通过将正则化方法与奇异性涉及的刚度矩阵，因此，进行数值分析，以准确地确定各种设计因素的修改螺母的最佳形状。还处理了具有弯曲斜面的修改后的螺母，得出的结论是，修改后的螺母对于较大公称直径和细螺距的螺栓显着有效，并且与螺距修改和锥形螺纹方法相比具有实用价值。
Many studies have been devoted to investigate how the maximum stress occurred in the bolted joint could be reduced. Patterson and Kenny suggest that a modified nut with a straight bevel at the bearing surface is effective. However, they only dealt with M30, and estimations on the nut geometry had not been necessarily sufficient. In this study, an extensive finite element approach for solving general multi-body contact problem is proposed by incorporating a regularization method into stiffness matrices with singularity involved; thus, numerical analyses are executed to accurately determine the optimal shape of the modified nut for various design factors. A modified nut with a curved bevel is also treated, and it is concluded that the modified nuts are significantly effective for bolts with larger nominal diameter and fine pitch, and are practically useful compared to pitch modification and tapered thread methods.