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An application of laser holographic interferometry to graphite-epoxy composite specimens is described. Impact damaged specimens as well as virgin ones are tested. Real-time holography is applied while the specimens are thermally strained. Irregular fringe patterns of closed shapes are observed around the damaged areas. The more damaged the specimen, the sooner the fringes appear and the larger their extension. The second technique considered in this paper is the thermoelastic response to deformation, the measurement of which provides an accurate estimation of the yield strength. Furthermore, it appears that the analysis of the adiabatic thermal behaviour may, in some cases, lead to the evaluation of the level of accumulated damage.

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Authors: LUCIA A C, JRC Ispra (IT);MELVIN A D, JRC Ispra (IT);SOLOMOS G, JRC Ispra (IT);ZANETTA P, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Monitoring and Predictive Maintenance of Plants and Structures, Firenze (IT), May 17-20, 1992
Availability: Available from (1) as Paper EN 36727 ORA
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