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30 May 2003 Fatigue detection by 2D folding shear interferometry with magnification
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Fatigue detection by two dimensional folding shear interferometry of subjected to cycling loading (pressure) composite vessel is presented. As the sensitivity of the applied method is higher in comparison with the other speckle-shear techniques, inspection of the small zone over the surface with magnification for the maximum permissible loading of the object is realized. The first step is measurement of a large surface area by lateral shear interferometry for selection of the zone with unusual mechanical response in loading, due to cracks, voids, impurities or other stress concentrators. At small lateral shear (1% over the object in our case) the obtained phase map modulus 2π coincides to derivatives of normal displacements. The moment hierarchy approach to time-series analysis is used for assessment of experimental results, as mechanical behavior of composite materials as a rule is non-linear and time depending. Further improvements of the techniques to application in fracture mechanics, lifetime and sudden (catastrophic) failures prediction are discussed.
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Ventseslav Ch Sainov, Assen Shulev, Sonja Nikolova Ossikovska, and Andrew David Irving "Fatigue detection by 2D folding shear interferometry with magnification", Proc. SPIE 5144, Optical Measurement Systems for Industrial Inspection III, (30 May 2003);

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