In the case of plane stress, the relationship between the fracture tou – McqOptions

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1.	In the case of plane stress, the relationship between the fracture toughness and crack extension force is given as _______ (where K is the fracture toughness, is the crack extension force, and E is the young s modulus).
A.	K= E
B.	K<sup>2</sup>= E
C.	K=( E)<sup>2</sup>
D.	K= /E
Answer» C. K=( E)<sup>2</sup>

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