Determination of residual stresses for helical compression spring through Debye-Scherrer ring method

In this work, the experimental study was conducted on fractured helical coil spring of a passenger car. The fracture occurred in ASTM A401 helical coil spring at the 2nd active coil, 20.24 mm from the bearing coil. A fitting Lorentz method was used to obtain the most intense peaks, which was placed at 0° and 35° X-ray incidence angles. Further, X-ray tri-axial stresses were obtained from conventional X-ray diffraction method for coil spring under consideration. The present method followed 2-D X-ray diffraction “ cos α ” method. FWHM of the spring was also investigated and validated with conventional X-ray diffraction method.