デジタル画像相関法を用いたウェブのひずみ分布の可視化

抄録

In web handling, some defects such as wrinkles occur due to the non-uniform strain distribution in the web. Hence it leads to the deterioration in quality and manufacturability. In order to improve the web handling productivity by clarifying the phenomena of defects generation and optimizing the handling conditions, the method of measuring the strain distribution of the web is needed. DIC(Digital Image Correlation) can measure a wide range of strain without contact, therefore we conducted a basic study to apply DIC to the web handling. One of the problems in measuring strain during web handling by DIC is the effect of large in-plane movement and out-of-plane vibration. In this study, we verified the strain measurement accuracy when a rigid body moves in and out of the plane. First, 2D-DIC and 3D-DIC measurements were performed while the web sample was moved rigidly. By applying 3D-DIC, it was found that the strain error due to unwanted movement and equipment vibration can be sufficiently reduced. Next, the strain during web handling in undeform web was measured by 3D-DIC using a simple handling system. The absolute value of strain error was 2.03×10^-5. Results of these experiments suggest that the strain can be measured with small error due to rigid body movement by using 3D-DIC.