Influence of structural parameters of resistancestrain gauge on straintransfer
                                         XV Yi qing1, YANG Xiao xiang2,3, WEI Tie ping4,YAO Jin hui5
(1.School of Petrochemical Technology, Fuzhou University, Fuzhou 350116, China;2.School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China;3.Quanzhou Normal University, Quanzhou 362000, China;4.School of Mechanical and Automotive Engineering, Fujian University of 
Technology, Fuzhou 350118, China;5.Fujian Province Institute of Metrology, Fuzhou 350003, China)

Abstract: 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.

Key words: resistance strain gauge; sensitive grid; strain transfer; finite element method(FEM)