摘要
为了研究法兰联接螺栓在横向振动的松动机理,借助于横向振动疲劳试验机进行模拟紧固件横向微动磨损试验,进而观察螺栓联接在不同的横向载荷与频率作用下预紧力与预紧力矩衰退过程,并测量其磨损量和表面损伤情况。实验结果表明:螺栓预紧力下降分为两个阶段;实验初期预紧力下降迅速的塑性形变阶段和预紧力下降缓慢的微动磨损阶段。预紧力矩下降分为三个阶段:第一阶段由于较高的局部接触应力,预紧力矩下降不明显;第二阶段由于塑性形变扩大,预紧力矩迅速下降;第三阶段螺栓进入微动磨损阶段,预紧力矩开始缓慢下降。螺栓在低频振动下,质量变化量对于频率微小的变化不敏感。螺栓与夹具接触的表面磨损情况随着交变幅值载荷增加而增加;随着频率的增加而减小。
In order to study the loosening mechanism of the flange joint bolt in the lateral vibration,the transverse fretting wear test of simulated fasteners was carried out by means of transverse vibration fatigue testing machine,and then the pretightening force and pre-loading of bolt joints under different lateral loads and frequencies were observed.,and measure the amount of wear and surface damage.The experimental results show that the bolt preload reduction is divided into two stages:the plastic deformation stage in which the pre-tightening force decreases rapidly and the fretting wear stage in which the pre-tightening force decreases slowly.The pre-tightening torque drop is divided into three stages:the first stage is not obvious due to the high local contact stress;the second stage is rapidly degraded due to the plastic deformation,and the third stage bolt enters the fretting wear.At the third stage,the pre-tightening torque begins to slowly decrease.Under low frequency vibration of the bolt,the amount of mass change is not sensitive to small changes in frequency.The surface wear of the bolt in contact with the clamp increases as the alternating amplitude load increases;it decreases as the frequency increases.
作者
赵晶
徐啸
ZHAO Jing;XU Xiao(Shenyang University of Technology Academy of Mechanical Engineering,Shenyang 110870,China)
出处
《机械强度》
CAS
CSCD
北大核心
2020年第4期831-836,共6页
Journal of Mechanical Strength
基金
辽宁省教育厅科研平台专项(LGD2016005)资助。
关键词
螺栓连接
横向振动
预紧力
预紧力矩
微动磨损
Bolt connection
Lateral vibration
Pre-tightening force
Pre-tightening moment
Fretting wear
