A steel bridge strut decreases in radius by 5% when put under load. By what percentage does it increase in length, if the Poisson ratio for steel is 0.3?
A)0.0%.
B)5.0%.
C)15.0%.
D)16.7%.
E)30.0%.

Question

Quizplus · Accepted Answer

The Poisson's ratio (ν) is the negative ratio of transverse to axial strain. If the radius decreases by 5%, the transverse strain is -0.05. Using the formula for Poisson's ratio, axial strain = -transverse strain / ν = 0.05 / 0.3 = 0.1667 or 16.7%.

A Steel Bridge Strut Decreases in Radius by 5% When