Chapter 11, Problem 11.60SP

A flat steel bar $\text{4}$ in. wide and $\frac{1}{2}$ thick must be reduced to a $\text{2}\frac{1}{2}$ in. width, as shown. The allowable tensile stress is $\text{15},000$ psi. If the applied axial tensile load is $\text{12},000$ lb, compute the minimum size fillet radius r that may be used.