摘要
针对电阻应变片引起的电阻应变式传感器应变传递误差问题,对不同的电阻应变片敏感栅结构参数进行了研究。建立了传感器弹性体(等强度梁)、基底、敏感栅和覆盖层的三维模型,利用ANSYS有限元软件,采用设置接触的方式将传感器弹性体与应变片粘贴在一起,分析对比了不同敏感栅材料、厚度、栅丝长宽比和栅丝间距时应变片应变分布情况,确定了传感器应变传递误差的影响因素。研究结果表明:敏感栅材料弹性模量越小、厚度越薄和栅丝长宽比越大,应变过渡区和应变传递误差越小,越有利于应变传递,越能准确反映弹性体变形;敏感栅栅丝间距存在最优值。研究结果给出了各结构参数下的相对误差,为传感器电阻应变片的结构设计和应变片的选择提供了依据。
Aiming at the strain transfer error of the resistance strain sensor caused by the resistance strain gauge,the structure parameters of different resistance strain gauge were studied.A three-dimensional model of the sensor elastomer(equal strength beam),the base layer,the sensitive grid and the covering layer was established.In order to study the influence factors of sensor strain transfer error,the strain distribution of strain gauge was analyzed by ANSYS,which was different sensitive grid material,thickness,length-width ratio and the grid pitch.In addition,the sensor elastomer was attached to the strain gauge by means of setting contact.The results indicate that the smaller the elastic modulus and thickness and the greater the length-width ratio,the smaller the strain transfer error and strain transition zone,which is more favorable to strain transfer.Besides,there is an optimal value for the grid pitch.The relative error of the structural parameters is given,which provide a basis for the structural design of strain gauge and the selection of strain gauge.
作者
许艺青
杨晓翔
韦铁平
姚进辉
XV Yi-qing;YANG Xiao-xiang;WEI Tie-ping;YAO Jin-hui(School of Petrochemical Technology,Fuzhou University,Fuzhou 350116,China;School of Mechanical Engineering and Automation,Fuzhou University,Fuzhou 350116,China;Quanzhou Normal University,Quanzhou 362000,China;School of Mechanical and Automotive Engineering,Fujian University of Technology,Fuzhou 350118,China;Fujian Province Institute of Metrology,Fuzhou 350003,China)
出处
《机电工程》
CAS
北大核心
2018年第4期352-357,共6页
Journal of Mechanical & Electrical Engineering
基金
福建省青年自然科学基金资助项目(2017J05071)
福建省教育厅科研资助项目(JAT160318)
关键词
电阻应变片
敏感栅
应变传递
有限单元法
resistance strain gauge
sensitive grid
strain transfer
finite element method(FEM)
