that the apparent fracture energy is GC ¼1, 654 296 J/m2. The error bound represents a 95 % confidence bound on the measured fracture energy. 5.5 Discussion The fracture energy measured in the coupon testing described above is now used to make failure predictions for model through wall defects. Figures 5.5, 5.6, and 5.7 below present full scale testing values for three defects and a failure prediction curve using Equation 5.2 above. The full-scale testing results were taken from previous work by Wilson [9], the material property values were taken from previous work by Kessler and co-workers [10]. Fig. 5.5 2 plys of 6K 3K repair Fig. 5.6 2 plys of 12 K 3K repair 5 Coupon-Based Qualification of Bonded Composite Repairs for Pressure Equipment 43
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