1.

The elastic critical shear stress of the web is given by

A. k<sub>v</sub>π<sup>2</sup>/[12(1+μ<sup>2</sup>)(d/t<sub>w</sub>)<sup>2</sup>].
B. k<sub>v</sub>π<sup>2</sup>E/[12(1+μ<sup>2</sup>)(d/t<sub>w</sub>)<sup>2</sup>].
C. k<sub>v</sub>π<sup>2</sup>E/[12(1-μ<sup>2</sup>)(d/t<sub>w</sub>)<sup>2</sup>].
D. k<sub>v</sub>E/[12(1-μ<sup>2</sup>)(d/t<sub>w</sub>)].
Answer» D. k<sub>v</sub>E/[12(1-‚âà√≠¬¨‚à´<sup>2</sup>)(d/t<sub>w</sub>)].


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