17 February 1987 Experimental Evaluation Of J-Integral For A Center-Cracked Plate Subject To Quasistatic Thermal Load
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Abstract
In this paper the theory of photocarrier holographic interferometry is presented to aeasure and analyze three dimensional displacements. From the photocarrier holographic interferogram, the fringe orders corresponding to object deformation can be easily determined by the demodulating process. By means of bi-needle projection method, utilizing the shadow and image parameters of the two needles in the hologram, the positions of the illuminating point and the observation point can be determined automatically. Taking advantage of these two methods, the interferograms could be analysed more quickly and accurately by the image processing system. The forenamed two methods were used to measure the thermal deformation field around a crack tip in a steel plate which subjected to a quasistatic thermal load at its two lateral sides. With combination of finite element method, J integral values were evaluated. By comparing with the theoratical value of J integral, good agreement was obtained.
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H. T. Fan, C. H. Shen, "Experimental Evaluation Of J-Integral For A Center-Cracked Plate Subject To Quasistatic Thermal Load", Proc. SPIE 0814, Photomechanics and Speckle Metrology, (17 February 1987); doi: 10.1117/12.941724; https://doi.org/10.1117/12.941724
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