Comparison between Methods of Determining Stress-intensity Factor (KI) from Isochromatic Fringes

概要

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Since the work of Post et al. in the early 50's on application of photoelasticity to fracture mechanics, many investigators have reported the photoelastic methods of determining stressintensity factors for the purpose of applying fracture mechanics to actual design problems. In some of these reports, we can see that several methods of using photoelastic isochromatic fringe data have been proposed. However, the paper to discuss the merits of those ones has not been seen except the critical review by Etheridge and Dally. In the present paper, double check of those ways of determining the stress-intensity factor (K<SUB>I</SUB>) from isochromatic fringe data was made and that was compared with the three methods (the method I, II and III) proposed by the authors in order to find the most accurate one among them. The result shows that, if we put them in order with regard to smallness of the average error determined from each eleven test measurements, those become Smith's method, Irwin's, the method II and the slope method, and so on. Since practice or experiences in this field for a long period would make it possible to acquire better accuracy in the K<SUB>I</SUB> determination, its measurement should be put into a skillful analyst's hands and also, we should be careful not to take inaccurate measurement of the distance of an isochromatic fringe from the tip of a crack.
日本実験力学会の論文