The DIC works by comparing digital photographs of a component or a test part at different stages of deformation. By tracking blocks of pixels, the system can measure surface displacement and create full-field 2D and 3D deformation vector fields and deformation maps. Digital image correlation (DIC) is a method of analyzing full-field images, based on digital images with gray values, that can determine the outline and displacements of an object under load in three dimensions.
How does digital image correlation work?
The DIC works by comparing digital photographs of a component or a test part at different stages of deformation. By tracking blocks of pixels, the system can measure surface displacement and create full-field 2D and 3D deformation vector fields and deformation maps.
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How accurate is digital image correlation?
The accuracy of DIC strain measurements tends to be around 10% below 0.3% deformation (3,000 µe), with a higher accuracy close to 1% above 3% deformation (30,000 µe). The measurement of deformation by DIC has been successfully tested with a deformation greater than 50%, and some applications achieve 100% deformation.
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