Revisit to the determination of stress-intensity factors and J-integrals using the caustics method
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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 ofro (radius of initial curve)/rp (plastic-zone size) andro/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.
KeywordsAluminum Mechanical Engineer Fluid Dynamics Polycarbonate Experimental Parameter
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