What is the relation between critical fracture stress and flaw size?

1.	What is the relation between critical fracture stress and flaw size?
A.	<sub>fr</sub> a
B.	<sub>fr</sub> a<sup>2</sup>
C.	<sub>fr</sub> 1/a
D.	<sub>fr</sub> 1/(a)<sup>1/2</sup>
Answer» E.

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