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Photoelastic and caustic experiments are conducted to obtain stress intensity factor, K, for both stationary and moving cracks. For the stationary crack the values of K are compared with the available theoretical and numerical solutions. Results show that the accuracy varies with the location of the crack tip for both the methods. Six parameter analysis of the photoelastic data gives better values as compared to the caustic results which in turn are better than the values obtained by three parameter photoelastic analysis. Dynamic photoelastic experiments are conducted with SEN, DCB and DCB/SEN specimens. The data obtained from these experiments namely the stress intensity factor and crack velocity, is compared with existing results and also with the values obtained from dynamic caustic experiment with SEN specimen. significantly lower. of crack velocity Values from caustic analysis are Stress intensity factor as a function is plotted and the results show a dependence on specimen geometry for cracks moving at high velocities.

Comparison of the Optical Techniques of Caustic and Photoelasticity as Applied to Fracture