Revisit to the determination of stress-intensity factors and J-integrals using the caustics method |
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Authors: | O. S. Lee S. K. Hong Y. S. Kim |
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Affiliation: | (1) Inha University, 253 Young-Hyun Dong, Nam-Ku, 402-751 Inchon, Korea |
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Abstract: | Applications of the optical (shadow) method of reflective caustics to measurement of the stress-intensity factor andJ integral in various specimens are investigated. The necessary experimental requirements to help determine accurate stress-intensity factor andJ integral are described. The ratios ofr o (radius of initial curve)/r p (plastic-zone size) andr o/t(thickness of specimen) are found to be very important experimental parameters to obtain meaningful stress and/or strain intensities surrounding crack tips. The appropriate ranges to determine accurate values of stress-intensity factor andJ integral for polycarbonate (compact tension) and aluminum (c-shaped tension) specimens are presented. Paper was presented at the 1992 SEM Spring Conference on Experimental Mechanics held in Las Vegas, NV on June 8–11. |
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