Effect of pitch difference on the fatigue strength of bolt and nut based on the modeling considering fitting clearance

摘要：

The bolts and nuts are widely used in various fields as an important joining machine element. However, the fatigue fracture usually happens at the root of the first bolt thread where the largest stress concentration always occurs. In this paper, a slight pitch difference is considered between the bolt and nut. First, with varying pitch difference, the fatigue experiment is performed and the fractured bolts are microscopically investigated. Next, the FEM analysis is applied and then the endurance limit diagrams are obtained according to the stress distribution status at each root of bolt thread. The conclusions are summarized as follows: (1) The pitch difference has a positive effect on the reduction of the stress and stress amplitude at the first root of bolt thread. (2) The fracture position and crack situation are changed depending on the pitch difference.

关键词： Fatigue Fracture Pitch difference Elastic-plastic Endurance limit diagrams

作者: Yoshikazu Sano Xin Chen Yu-Ichiro Akaishi Yasushi Takase Nao-aki Noda

作者单位: Kyushu Institute of Technology,Kitakyushu 804-8550, Japan Kyushu Institute of Technology, Kitakyushu 804-8550, Japan

会议类型: 国际会议

会议名称: 2012 International Symposium on Structural Integrity 2012国际结构完整性学术研讨会 ISSI 2012

会议地点: 济南

会议语种:英文

页码: 153-155

在线出版日期: 2012-10-31（万方平台首次上网日期，不代表论文的发表时间）