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Real time quantitative measurement of stress intensity factor at crack tip by digital holographic interferometry

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Document pages: 8 pages

Abstract: The detection of object cracks is the key problem of transparent object health monitoring. The real-time quantitative measurement of crack tip stress intensity factor (SIF) is still an open problem. In this paper, a real-time quantitative measurement method of mode I crack stress intensity factor based on digital holographic interferometry (DHI) is proposed. A transmission digital holographic system is established to measure the phase difference of object wave during loading. The expression of stress intensity factor from phase difference is derived. In order to improve the measurement accuracy, the calibration phase unwrapping method based on least square method and iterative median filter is used to extract the actual phase from the phase wrapped by noise. SIF of mode crack in a transparent polymethyl methacrylate (PMMA) specimen are measured by this approach. The results are compared with the theoretical ones to demonstrate the feasibility of the proposed approach.

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