卡套式管接头塑性松动机理分析  

Mechanism analysis of ratcheting on self-loosening behavior of sleeve type pipe joint

作　　者：王翔宇 卢剑伟 马玉才 WANG Xiangyu;LU Jianwei;MA Yucai(School of Automobile and Traffic Engineering, Hefei University of Technology, Hefei 230009, China;Chuzhou Xingda Mechanical and Electrical Co., Ltd., Chuzhou 239500, China)

机构地区：[1]合肥工业大学汽车与交通工程学院,安徽合肥230009 [2]滁州兴达机电有限公司,安徽滁州239500

出　　处：《合肥工业大学学报（自然科学版）》2019年第10期1318-1324,共7页Journal of Hefei University of Technology：Natural Science

基　　金：教育部新世纪优秀人才支持计划资助项目(NCET-10-0358)

摘　　要：文章考虑棘轮效应定义的材料本构模型,采用频域积分方法得到位移载荷,对管接头塑性松动阶段的行为进行了数值模拟,并探讨了初始预紧力、侧向载荷、摩擦系数对松动的影响规律。结果表明:在轴向预紧力作用下,侧向循环载荷引起的材料棘轮效应导致结构塑性应变不断发展,引起张紧力的下降;第1圈工作螺纹承担载荷较多,等效应力和塑性应变集中于牙根部位;侧向循环载荷下,连接结构的等效应力、接触应力、塑性应变逐渐增大,同一圈螺纹不同位置的材料受拉压程度不同,应力和应变呈非线性变化;较大的侧向载荷幅值、初始预紧力、摩擦系数会加快塑性松动。A constitutive model of material was defined considering the ratcheting behavior, and the loosening process of pipe joints was studied numerically based on the data collected by a frequency-domain integral method. Furthermore, some factors affecting the loosening process such as pre-tightening force, side load and friction factor were analyzed. Results showed that under the axial preload, the ratcheting behavior caused the constant development of the structural plastic strain and the tension declined;the first cycle of threads bore most part of load, equivalent stress and plastic strain were concentrated at its tooth base;in the following side-load cycles, structural contact stress, equivalent stress and plastic strain were growing steadily, different locations on the same cycle of thread had different responses;greater load amplitude, pre-tightening force and friction factor would accelerate the loosening process.

关 键 词：管接头 松动 棘轮效应 应力分布 数值模拟 

分 类 号：TH123.4[机械工程—机械设计及理论]