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# An offset $h$ must be introduced into a metal tube of $18-\mathrm{mm}$ outer diameter and $2-\mathrm{mm}$ wall thickness. Knowing that the maximum stress after the offset is introduced must not exceed four times the stress in the tube when it was straight, determine the largest offset that can be used.

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An offset h is introduced in a tube circular rod, as shown in figure P11.58. The problem requires determining the largest offset considering that maximum stress after the offset is introduced must not exceed four times the stress in the rod when it was straight. The properties of the rod are given as;

$d_o=18\, \ \text{mm}$ $t=2\, \ \text{mm}$, therefore, $d_i=18-2\cdot2=14\, \ \text{mm}$

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