An Si-O bond with a Young's modulus of 9*1010Nm?1 have an elliptical crack of depth 7nm. The surface energy is 2.29 J. Estimate fracture stress for silica fiber.
A) 4.32*109nm?1
B) 6.32*109nm?1
C) 5.2*109nm?1
D) 3*109nm?1
Correct Answer:
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