Accuracy improvement of thermoelastic stress and dissipation energy measurement by motion compensation with optical-infrared synchronous measurement

Abstract

On the infrared thermography image, an apparent temperature change caused by the relative displacement between moving object and infrared camera is obtained. This paper shows the motion compensation system with the optical-infrared synchronous measurement. Displacement information of the specimen is calculated from the series of optical image using the digital image correlation method. The displacement information on the optical image is reflected to the infrared image by homography. For obtaining the displacement information by digital image correlation method, random pattern on the surface of measured object is required. In this study, white random pattern was drowned by the sputtering painting method. The motion compensation system was applied to the thermoelastic stress analysis for the specimen having a circular hole. It was confirmed that the apparent temperature change and edge effect can be removed by using developed motion compensation system.