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The first and second mode stress intensity factors (SIFs) of a contactproblem between a half-plane with an edge crack and an asymmetric tilted wedgewere obtained using experimental method of Digital Image Correlation (DIC). Inthis technique, displacement and strain fields can be measured using twodigital images of the same sample at different stages of loading. However,several images were taken consequently in each stage of this experiment toavoid the noise effect. A pair of images of each stage was compared to eachother. Then, the correlation coefficients between them were studied using acomputer code. The pairs with the correlation coefficient higher than 0.8 wereselected as the acceptable match for displacement measurements near the cracktip. Subsequently, the SIFs of specimens were calculated using displacementfields obtained from DIC method. The effect of wedge tips angle on their SIFswas also studied. Moreover, the results of DIC method were compared with theresults of photoelasticity method and a close agreement between them wasobserved.

The Effect of Wedge Tip Angles on Stress Intensity Factors in the  Contact Problem between Tilted Wedge and a Half Plane with an Edge Crack  Using Digital Image Correlation