, Volume 34, Issue 3, pp 262-270

Two-dimensional electronic-speckle-pattern interferometry and concrete-fracture processes

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Electronic-speckle-pattern interferometry (ESPI) is an optical nondestructive testing technique. A two-dimensional in-plane displacement sensitive interferometer was designed to observe progressive development of microcracking of carbon-fiber-reinforced concrete specimens subjected to tension. By using the two-dimensional ESPI system, the fracture processes, crack initiation and crack propagation of concrete specimens were monitored qualitatively and in real time. The displacement and strain fields were analyzed quantitatively by using digital image processing techniques.

Paper was presented at the 1993 SEM Spring Conference on Experimental Mechanics held in Dearborn, MI on June 9–11.