For the hollow cylinder problem illustrated in Fig. 14.5, show that the usual restrictions on Poissons ratio,

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For the hollow cylinder problem illustrated in Fig. 14.5, show that the usual restrictions on Poisson’s ratio, 0 ≤ v≤ 1/2, and n > 0 imply that:

-2+k+n0, -2-k+n0 2 + kv - nv k-n+2v > 1, 2-kv-nv k+n-2v <1

Using these results, develop arguments to justify that the stresses in solution (14.2.7) must satisfy σθ > 0 in the cylinder’s domain. Thus, stresses in the nonhomogeneous problem have behavior similar to those of the ungraded case.

Fig 14.5

Pi b a Po

Equation 14.2.7

or = e Pia(2+k-n)/2 bk - ak [ r(-2+k+n)/2 _ Bp(-2-k+n)/2] Pia(2+k-n)/2 [2 + kv- k - nv k-n+2v 2-kv - nv

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