The stress field (15.1.7) for the screw dislocation produces no tangential or normal forces on a cylinder

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The stress field (15.1.7) for the screw dislocation produces no tangential or normal forces on a cylinder of finite radius with axis along the dislocation line (z-axis). However, show that if the cylinder is of finite length, the stress τ on the ends will not necessarily be zero and will give rise to a resultant couple.

Equation 15.1.7

ub  gy = de = 0 = tr = tr = 0

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