Crack profiles in mortar measured by holographic interferometry |
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| Authors: | R A Miller S P Shah H I Bjelkhagen |
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| Institution: | (1) Department of Civil Engineering, Northwestern University, 60208 Evanston, IL;(2) Center for Concrete and Geomaterials, Northwestern University, 60208 Evanston, IL;(3) Biomedical Engineering, Northwestern University, 60208 Evanston, IL |
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| Abstract: | In order to test the accuracy of theoretical fracture models for mortar and concrete, it is necessary to have accurate measurements of the crack profiles. In this study, sandwich holographic interferometry has been used to find the crack profiles in a center-notched plate specimen loaded at the center of the notch. The results have shown that at low load levels with corresponding short crack lengths, there is little difference between the measured crack profiles and elastic crack profiles computed by finite-element analysis. At high loads with long crack lengths there is a large difference between measured and computed elastic crack profiles. The data suggest the presence of a closing pressure at the crack tip and that there may be a limit to crack-tip-opening displacement (CTOD) before the crack propagates. |
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