摘要
系统运用材料物理学、弹性力学、热力学、工程测试技术的理论知识以及有限元数值仿真、实验分析等方法,研究高温应变片热输出误差的影响因素并得出补偿修正模型.首先根据材料电阻温度效应理论及热膨胀理论研究了高温应变片热输出的耦合特性,建立耦合作用下高温应变片的热输出模型,得到了构件、胶层和应变片三者耦合作用下应变片热输出的理论表达式;然后根据材料的电阻温度效应推导出不同栅丝材料的电导率参数,利用有限元仿真得到不同材料栅丝的热输出特性,选择其中的两种栅丝材料作为本文的研究对象得到其在耦合作用下的热输出并与实验数据对比,相对误差小于7%.最后基于理论模型和实验结果,建立了高温应变片热输出补偿模型,补偿修正后结果与理论值误差在9%以内,补偿效果良好.
Contact strain measurement is used to study the high-temperature mechanical behavior of materials and components.The measurement precision,which is mainly affected by the thermal output,is very vital in high-temperature strain measurement. By combining experimental analysis with the theories of materials physics,elastic mechanics,thermos-dynamics,mechanical engineering testing technology,and finite element method（ FEM）,the influence factors of the thermal output error of high-temperature strain gauge were studied,and a compensation model was established,and then a test was conducted to verify the model accuracy and experimental results. In this study,the coupling characteristics of the thermal output of high-temperature strain gauges were investigated based on the thermal expansion theory and the temperature-resistance properties of the material,and the thermal output model of strain gauges was established. Then,the theoretical expression of the heat output under the coupled action of the member,rubber layer,and strain gauge was obtained. Based on the resistor-temperature effects,the electrical conductivities of different wire materials were obtained,and the thermal output property of the grid wire was studied by finite element method. According to the results,two kinds of wire mesh materials were selected as the research object of this paper,and the simulation results were compared with the experimental data,the relative error is less than 7%. Finally,a compensation model of high-temperature strain thermal output was obtained from the theoretical model and experimental results. The results show that the error between the compensation correction and the theoretical value is less than9%; thus,the error compensation is efficient.
作者
王文瑞
温晓东
胡挺
张佳明
WANG Wen-rui;WEN Xiao-dong;HU Ting;ZHANG Jia-ming(School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China;Research Center for Aerospace Vehicles Technology,University of Science and Technology Beijing,Beijing 100083,China;Beijing TaiFang Technology Limited Company,Beijing 100085,China)
出处
《工程科学学报》
EI
CSCD
北大核心
2018年第9期1131-1137,共7页
Chinese Journal of Engineering
基金
国家重大科学仪器设备开发专项资助项目(2011YQ14014507)
航空科学重点实验室基金资助项目(20145674004)
中央高校基本科研业务费资助项目(FRF-TP--15-023A3)
关键词
高温应变片
热输出
应变测量
精度
耦合特性
high-temperature strain gauge
thermal output
strain measurement
precision
coupling characteristics
