An Si-O bond with a Young’s modulus of 9*1010Nm-1 have an elliptica – McqOptions

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1.	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
Answer» B. 6.32*109Nm-1

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