This Solution Smallest Diameter of Normal Stress by Johnston Beer

2.10     A 9-kN tensile load will be applied to a 50-m length of steel wire E = 200 GPa. Detemine the smallest diameter wire which can be used, knowing that the normal stress must not excedd 150 Mpa and that the increase in the length of the wire should be at most 25 mm.

Guru Solution

Considering allowble Stress

Considering allowable elongation

Larger Area Governs

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