Thermal strain measurement of a double ring structure using digital image correlation method

Thermal output is a source of large error in the thermal deformation measurement of specimens under temperature change when a strain gauge is used. In this study, the digital image correlation (DIC) method is employed to measure the full-field thermal deformation and strain of a double ring structure consisting of an inner aluminum ring and an outer titanium ring. The thermal deformation of the ring was measured up to 200 degrees C and the heating condition of the double ring structure was analyzed by finite element simulation. The results confirm that the deformation and strain fields obtained from the DIC method were in good agreement with the analysis result.