交变横向载荷下螺栓联接自松弛有限元研究  

Finite element research on self-loosening problem of bolt connection under the alternating lateral load

作　　者：何竞飞[1] 汤涛[1] 汪成生 

机构地区：[1]中南大学高性能复杂制造国家重点实验室,长沙410083

出　　处：《现代制造工程》2016年第3期1-6,共6页Modern Manufacturing Engineering

基　　金：国家重点基础研究发展"973"规划资助项目(2013CB035706)

摘　　要：针对承受交变横向载荷的螺栓,根据螺纹轮廓建立可实现理想六面体单元网格划分的螺栓联接有限元模型,并以此为平台研究了啮合螺纹之间的微量滑移,揭示了螺栓自松弛的微观机理,绘制了横向剪切力与横向位移载荷之间的迟滞回线,直观地描述了螺栓预紧力的变化过程,分析了螺栓预紧力和螺母旋转松动量随交变横向载荷变化的规律,分析结果同螺栓自松弛微观机理的解释和迟滞回线的描述是一致的,从而说明了自松弛微观机理分析的合理性。For the bolt connection that bears the alternating lateral load, built a finite element model which can realize the hexa- hedral element mesh considering the thread profile. Used the model to study the micro-slip between the engaged thread and reveal the microscopic mechanism of the self-loosening problem. Used a hysteresis curve, which reflects the relationship between the transverse shear force and the lateral displacement loads, described the changing process of preload intuitively. Analyzed the chan- ges of preload and the rotation of nut along with the alternating transverse load. The result was consistent with the microscopic mechanism analysis and the description of the hysteresis curve, pointed out the rationality of the self-loosening microscopic mech-anism analysis.

关 键 词：螺栓联接 有限元 横向载荷 自松弛 

分 类 号：TH131.3[机械工程—机械制造及自动化]