Misconceptions about temperature compensation in experimental stress analysis

Abstract

Abstract Resistance strain testing technology is widely used in engineering structures to obtain the strain response of the structure and analyze the accurate stress state of the structure. By analyzing the working principle of the resistance strain sensor and its corresponding temperature compensation principle, and recognizing the interrelation of the temperature strain of the structure, the temperature strain of the compensation block and the temperature strain of the resistance strain sensor, the mistake of the principle of temperature compensation in the structural resistance strain testing technology is revealed. It is the conceptual confusion between structural temperature strain and compensation block temperature strain that leads to the mistake in temperature strain compensation. The test results not only do not eliminate the temperature strain of the structure, but also add the effect of temperature stress. However, when the component is not subjected to mechanical loads, the current structural strain testing technique based on the temperature strain compensation is effective in obtaining the temperature stresses in the component.