HIGH RESOLUTIONAL 3D-DIC MEASUREMENT SYSTEM AND ACCURACY VERIFICATION FOR CONCRETE SPECIMENS

Abstract

This paper develops a three-dimensional digital image correlation (3D-DIC) measurement system for measuring 3D deformation and crack propagation in concrete, and verifies the accuracy and availability. Stereo matching is incorporated with the system to measure out-of-plane displacements. High resolutional digital cameras are used to realize the high accurete measurements. The principle of 3D-DIC measurement based on stereo matching is first explained. The measuring accuracy of the system is then verified for the 3D shape and displacement of concrete’s test specimens. Finally, 3D crack propagation behavior of concrete’s cylinder specimen is measured and visualized to demonstrate the availability of the 3D-DIC system.