Question

The following crack growth data were obtained from a center-cracked panel subjected to a stress range of 50 ksi. Plot the crack size, a, as a function of life, N. Determine the crack growth rate da/dN. Plot da/dN as a function of ?? and determine the Paris constants Compare the da/dN values calculated to the following values given. How sensitive are Paris constants to the da/dN values. [30 point] Crack Length in daldN (in./cycle) Cycles 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000 100,000 0.009 0.010 0.012 0.015 0.018 .025 0.040 0.060 0.100 0.200 1.56 x 10-7 2.46 x 10-7 5.10 × 10-7 4.50× 10-7 1.05 × 10-6 1.74 x 10 2.94x 10-6 6.81 x 10-6

Answer 1

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