Abstract
Crack-opening interferometry is a technique whereby one can directly measure the normal opening displacement of a crack that exists in a transparent material. Here, wer extend the techique to situations in which the crack lies along the interface between a stransparent material and a highly reflective metal. We discuss how the intensity distribution and the placement of the fringes vary with reflectivity of the metal. However, because the fringe spacing is not affected, the fringes can still be interpreted in terms of normal crack-opening displacement profile. The paper reports experimental measurements of crack-opening displacement profile of an interface crack in a copper-sapphire bircystal. The results show the crack-opening displacement profile to be that of a constant opening angle.
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when work was performed. Current affiliation is as Research Associate, Division of Engineering, Brown University, Providence, RI 02912.
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Kysar, J.W. Crack-opening interferometry at interfaces of transparent materials and metals. Experimental Mechanics 41, 52–57 (2001). https://doi.org/10.1007/BF02323104
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DOI: https://doi.org/10.1007/BF02323104