The minimum thickness of the material to achieve the condition of plan

1.	The minimum thickness of the material to achieve the condition of plane strain is given by ______
A.	B=2.5 (K<sub>IC</sub>/ <sub>o</sub>)
B.	B=2.5 (K<sub>IC</sub>/ <sub>o</sub>)<sup>2</sup>
C.	B=2.5 (K<sub>IC</sub>/ <sub>o</sub>)<sup>1/2</sup>
D.	B=2.5 (K<sub>IC</sub>/ <sub>o</sub>)<sup>-1/2</sup>
Answer» C. B=2.5 (K<sub>IC</sub>/ <sub>o</sub>)<sup>1/2</sup>

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