15-4: The circumferential (hoop) stress in a cylinder of 1045 steel, due to water quenching followed by glass bead peening, is measured with a diffractometer ( CrKa radiation, 211 reflection). The line shift 2 when a stress-free specimen is rotated from = 0 to =45 is 0.10. Take the stress constant K1 as 90ksi/deg. The time t given below is the time required to accumulate 20,000 counts at each angle. Calculate the residual stress with and without correction for line asymmetry by the LPA factor