Abstract
The use of mesh based global digital image correlation is proposed for measuring displacement fields around a crack tip. Displacement components at all nodes of a finite element model are simultaneously obtainable from images before and after deformation by global digital image correlation. Therefore, discontinuous displacement fields can be obtained using a finite element mesh with a crack. The effectiveness is demonstrated by measuring the displacement fields around a desiccation crack. Results show that the near-tip displacement distributions are obtained using global digital image correlation with singular elements at the crack tip.
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