电阻应变测试技术中的温度补偿功能辨析

针对基于温度应变补偿的结构电阻应变测试技术,分析了结构温度应变的产生原理与结构温度应变的补偿原理,辨析了结构温度应变与补偿块温度应变二者的相互关联与差异.在此基础上,指出了基于温度应变补偿模式的结构电阻应变测试技术的错误在于:概念上混淆了结构的温度应变与补偿块的温度应变,导致了结构温度应变的错误补偿.同时,给出了正确实现工程结构应变测试的环境条件,以最大限度地保证了结构应变测试数据的客观性与可靠性.

ANALYSIS OF THE TEMPERATURE STRAIN COMPENSATION IN ELECTRIC RESISTANCE STRAIN MEASURING TECHNIQUE

The electric resistance strain measuring technique is very important in the structure stress analysis. This paper analyzes the temperature strain compensation in the electric resistance strain measuring technique, including the forming principle of the structure temperature strain and the compensation principle of the structure temperature strain. The temperature strain in the testing structure and that in the compensation component have their relations and differences. A misconception of the temperature strain in the testing structure and that in the compensation component is pointed out and it is shown that it might lead to a wrong structure temperature strain compensation. Meanwhile, a correct condition is proposed to guarantee the objectivity and the reliability of the testing data during the engineering structure strain measurement.