摘要
基于永磁效应提出一种新的钢绞线无损应力检测方法,由永磁体的分子环流模型推导了矩形永磁体磁场强度分布,建立反映钢绞线应力与传感器内永磁体磁感应强度的力-磁关系理论模型。利用Ansys Maxwell电磁有限元软件对力-磁关系理论模型进行了数值分析。结果表明,钢绞线的受力状态与永磁磁感强度存在函数对应关系,以轴线中点为原点,原点起始磁强数值最高,此时钢绞线应变应力增大,磁感应强度数值沿两侧按一定规律逐渐减小。据此,提出一种新型的应力检测传感结构,并搭建了试验验证平台。试验数据分析表明,在多次加、卸载循环下,加载时磁通量随应力增大而减小,卸载时磁通量随应力减小而增加,线性函数和二次函数均能较好地描述磁感强度与应力应变值之间的相互关系,验证了笔者提出的检测理论和传感结构的可行性和有效性。
A new method for nondestructive stress detection of steel strand was proposed based on the permanent magnet effect.Based on the molecular circulation model of permanent magnet,the magnetic field intensity distribution of rectangular permanent magnet was derived,and a force-magnetic relationship theoretical model that reflected the stress on steel strands and the magnetic induction strength of permanent magnets inside the sensor was established.Ansys Maxwell electromagnetic finite element software was used to carry out numerical analysis on the proposed force-magnetic relationship theoretical model.The results show that there is a functional correspondence between the force state of the steel strand and the magnetic induction strength of the permanent magnet.Taking the midpoint of the axis as the origin,the initial magnetic strength value at the origin is the highest.At this time,the strain and stress of the steel strand increase,and the magnetic strength value gradually decreases along both sides according to a certain pattern.Thereby,a new type of stress detection sensing structure was proposed,and an experimental verification platform was built.Experimental data analysis shows that under multiple loading and unloading cycles,the magnetic flux decreases with the increase of stress during loading and increases with decrease of stress during unloading.Both the linear function and the quadratic function can well describe the interrelationship between magnetic induction intensity and stress-strain values,which verifies the feasibility and effectiveness of the proposed detection theory and sensing structure.
作者
袁飞云
闫红光
杨跃东
张奔牛
蒋海飞
YUAN Feiyun;YAN Hongguang;YANG Yuedong;ZHANG Benniu;JIANG Haifei(Sichuan Tibet Expressway Co.,Ltd.,Chengdu 610047,Sichuan,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Sichuan Lushi Expressway Co.,Ltd.,Chengdu 610000,Sichuan,China;C+E Center for Engineering Research Test and Appraisal Co.,Ltd.,Beijing 100142,China)
出处
《重庆交通大学学报（自然科学版）》
CAS
CSCD
北大核心
2024年第2期10-16,共7页
Journal of Chongqing Jiaotong University(Natural Science)
基金
四川藏区高速公路联合技术攻关专题项目(藏高科技2021-03)
国家自然科学基金项目(52178272)
重庆市自然科学基金项目(cstc2021jcyj-msxmX1011)。
关键词
桥梁工程
钢绞线
应力检测
永磁体
磁感应强度
磁场
bridge engineering
steel strand
stress detection
permanent magnet
magnetic induction intensity
magnetic field
