Correction method for improving high-temperature strain measurement precision

Abstract

The invention discloses a correction method for improving high-temperature strain measurement precision. The correction method comprises the following steps: carrying out calibration experiments on sensitivity coefficient, heat output, null drift and creep parameters of a high-temperature strain sensor; aiming at the sensitivity coefficient and the heat output, fitting calibration results at different temperatures to obtain a curve expression of the sensitivity coefficient and a curve expression of the heat output at different temperatures; aiming at the null drift and the creep, respectively selecting calibration results of a preset duration as calibration data at corresponding temperatures, and then respectively fitting the calibration results at different temperatures to obtain a curve expression of the null drift and a curve expression of the creep at different temperatures; based on this, establishing a comprehensive correction model; and correcting the measurement result of the high-temperature strain measurement experiment by using the comprehensive correction model. Through the correction of various compensation models, the influence caused by most temperature can be eliminated.

Description

technical field [0001] The invention relates to the technical field of high-temperature strain testing, in particular to a correction method for improving the measurement accuracy of high-temperature strain. Background technique [0002] With the rapid development of science and technology, the working environment of key components of many equipment in aerospace, petroleum, chemical, metallurgical and other engineering fields is becoming more and more complex. Under high temperature conditions, the physical properties of the materials of the components will also change accordingly. For example, the elastic modulus decreases, the high-temperature creep effect occurs, and the linear expansion coefficient increases, thereby affecting the stress field and temperature field. When the temperature rises further, it will also lead to the failure of the component, often with different degrees of damage and deformation, resulting in The service life of the components is shortened, ser...

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Problems solved by technology

[0003] The present invention provides a correction method for improving the accuracy of high-temperature strain measurement, so as to solve the shortcomings of low precision and large errors in the strain gauge in the process of high-temperature strain measurement , the indicated strain of the strain gauge usually has a certain gap with the real result.

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