The plate has a hole centered across the width. The stress

Chapter 2, Problem 2.C5

(choose chapter or problem)

The plate has a hole centered across the width. The stress concentration factor for a flat bar under axial loading with a centric hole is

\(K=3.00-3.13\left(\frac{2 r}{D}\right)+3.66\left(\frac{2 r}{D}\right)^{2}-1.53\left(\frac{2 r}{D}\right)^{3}\)

where r is the radius of the hole and D is the width of the bar. Write a computer program to determine the allowable load P for the given values of r, D, the thickness t of the bar, and the allowable stress \(\sigma_{\text {all }}\) of the material. Knowing that \(t=\frac{1}{4} \mathrm{in}\)., D = 3.0 in. and \(\sigma_{\text {all }}=16 \mathrm{ksi}\), determine the allowable load P for values of r from 0.125 in. to 0.75 in., using 0.125 in. increments.