摘要
为研究存在两腐蚀点时钢绞线磁信号的变化规律以及腐蚀点之间的相互影响,设计了4组不同间距的试件,利用电化学腐蚀装置控制腐蚀程度,再通过三维磁信号扫描装置测试漏磁信号。研究表明:单个腐蚀区域的判断准则也适用于两个腐蚀区域;距离较近的两腐蚀区域的磁信号会在两点之间产生叠加,出现极值,且不同提离高度下磁信号曲线的汇交距离与腐蚀区域的间距呈正相关;试件在腐蚀区域会发生磁信号的突变,其变化范围具有一定宽度,该影响宽度与试件腐蚀度呈Boltzmann函数分布,可用该曲线影响宽度评价单个腐蚀区域的腐蚀程度,也可用于确定两个腐蚀区域在确定特定腐蚀度下不产生叠加的最小间距。
In view of the variation rule of magnetic signal of steel strand with two corrosion points and the interaction between corrosion points,four groups of specimens with different spacings were designed.The corrosion degree was controlled by electrochemical corrosion device,and the magnetic leakage signal was measured by three-dimensional magnetic signal scanning device.The research shows that the criterion of single corrosion region is also applicable to two corrosion regions.However,when the two points are close to each other,the superposition of the magnetic signals will occur and the extreme value will appear.Moreover,the intersection distance of the magnetic signal curve is positively correlated with the distance between the corrosion areas at different lift heights.The magnetic signal of the specimen changes abruptly in the corrosion area,and its variation range has a certain width.The distribution of the influence width and the corrosion degree is Boltzmann function.The influence width of the curve can be used to evaluate the corrosion degree of a single corrosion zone and to determine the minimum spacing between two corrosion zones without superposition under a given degree of corrosion.
作者
周建庭
黎娅
张洪
夏润川
杨文琦
ZHOU Jianting;LI Ya;ZHANG Hong;XIA Runchuan;YANG Wenqi(State Key Laboratory of Bridge and Tunnel Engineering in Mountainous Areas Jointly Built by the Ministry and the Province,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《重庆交通大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第7期74-81,共8页
Journal of Chongqing Jiaotong University(Natural Science)
基金
国家自然科学基金项目(U20A20314)
重庆市自然科学基金创新群体科学基金项目(cstc2019jcyj-cxttX0004)
重庆市杰出青年科学基金项目(cstc2020jcyj-jqX0006)
重庆市城市管理局科研项目(城管科字2019第25号)。
关键词
桥梁工程
自发漏磁
无损检测
钢绞线
腐蚀
bridge engineering
spontaneous magnetic flux leakage
nondestructive testing
steel strand
corrosion
