Ultrasonic measurement on axial force of high-strength bolt in service
Ultrasonic measurement on axial force of high-strength bolt in service
复制标题
高强度螺栓在用轴向力的超声波测量
DOI：
10.1177/1461348418815405
复制
发表时间：
2018
影响因子：
2.3
通讯作者：
K. Yao
中科院分区：
文献类型：
--
作者：
Xin;Yiming Li;Xiao;K. Yao
为减少高强螺栓延迟断裂对列车运行和结构安全的影响，研究了铁路钢桥高强螺栓轴力无损检测方法，及时识别和更换过扭螺栓，以减少外部因素造成的延迟断裂概率。基于声弹效应理论，考虑到螺栓在使用过程中内部应力分布不均匀，本文将螺栓受力区域划分为螺母、螺杆和螺纹三个区域;作者计算了超声波飞行-修正了螺栓弹性变形和外力作用下的温度对声速的影响，提出了更精确的在役螺栓轴力测量方法试验结果表明，超声波测量结果与压力传感器显示值的相对误差小于10%。
In order to reduce the effect of delayed fracture of high-strength bolts on train operation and structural safety, a non-destructive testing method for axial force of high-strength bolts in railway steel bridges is studied to identify and replace over-twisted bolts in time, so as to reduce the probability of delayed fracture caused by external factors. Based on the acoustic-elastic effect theory, considering the uneven internal stress distribution of bolts in service, in this paper, the bolt force area is differentiated into three regions: the nut, the screw and the thread; the author calculates the ultrasonic flight-time in different bolt stress areas and revises the impact of bolt elastic deformation and temperature by external force on sound speed and puts forward a more precise measurement method of axial force of bolt in service. According to the results of the test, the relative error between the ultrasonic measurement result and the displayed value of pressure sensor is less than 10%.