A typical residual stress pattern in an extruded bar is shown in Figure. To ?nd the residual stresses in an extruded bar of brass, 1.000 in. diameter and 10.000 in. long, the bar was put in a lathe and machined to a diameter of 0.900 in. After machining, the length was found to be 10.004 in. What was the average residual stress in the layer that was machined away? For the brass, E = 110 GPa. For simplicity, neglect the Poisson effects.