Digital Image Correlation (DIC)

The group operates a LaVision DaVis digital image correlation (DIC) system for full-field, non-contact surface strain measurement. A single camera system is used, providing 2D DIC capability with a spatial resolution of approximately 2 μm per pixel and a typical strain resolution of ~50 μm. Image acquisition is supported by LED strobe lighting, and frame rates between 0.1 and 10 Hz can be achieved, making the system well-suited to quasi-static and moderately dynamic loading conditions. Image acquisition and post-processing are both performed within the DaVis software environment.

Specimens are prepared with a speckle pattern applied by spray painting, with speckle sizes typically in the range of 10–50 μm. The paint used is compatible with the full range of testing temperatures available across the group's mechanical testing facilities, remaining stable from −150°C to 1000°C. DIC can therefore be used in conjunction with the ETMT, Linkam TST350, Deben in-situ SEM stage, and Instron test frames. For further information and access, contact Dr Hon Tong Pang.