Research on disturbance characteristics in high temperature DIC measurement due to heat flow and its correction method

摘要

Digital Image Correlation (DIC) is an optical measurement method that can measure the deformation and even theappearance of an object. Because of the superiority of non-contact, full field, and low environment requirements, DIC canbe used to measure the high temperature mechanical properties of materials in extreme environment. However, there arestill difficulties in applying DIC in high temperature displacement measurement, such as heat flow disturbance. It willdistort the images acquired at high temperature and affect the measurement accuracy of DIC. In this paper, the disturbancecharacteristics caused by heat flow are studied and the corresponding correction method is proposed. Firstly, the causes ofdistortion and the distortion characteristics are analyzed and then verified by experiments. Second, a method for correctingthe distortion caused by heat flow is proposed. Finally, the availability of the proposed correction method is verified byexperiment.