Study on Rolling Processing Evaluation Characteristics Using Sub-DIC Method

Abstract

It is extremely important to evaluate the rolling deformation and large strain distribution conditions in the surface of the processed materials after machining. On the other hand, the sub-pixel digital image correlation (Sub-DIC) method enables to measure the full-field strain distribution only using the photographs taken by the commercially available digital camera. This study aims to develop the rolling deformation and the large strain distribution conditions using the Sub-DIC method. Here, it is well known that the measurement accuracy deteriorates in large strain conditions when the conventional Sub-DIC method is used. In this paper, we proposed the facility technique for measuring the large strain distribution by the Sub-DIC method in which the sub-set area are applied to the strain regarding the reduction in thickness of rolling processing. And, we demonstrated the measurement characteristics using the facility Sub-DIC method through a series of experiments from the viewpoint of changes in the test piece surface strain distribution conditions. Moreover, we evaluated the curve of test piece after rolling processing with a radius of curvature. Finally, we discussed measurement characteristics of the steady/ unsteady conditions in the rolling processing using the facility Sub-DIC method.