Influence Of Shot Peening On The Residual Stresses In Spring Steel Plate

Author:  DeLitizia, Alfred T.
Source:  Conf Proc: ICSP-2, (p.237-240)
Doc ID:  1984034
Year of Publication:  1984
Abstract:  
The influence of six different SAE cast steel shot sizes (S-280, S-330, S-390, S-460, S-550, and S-660), measured under constant flow rate of 454 kilograms per minute and the travel speed of the work piece through the blast adjusted to obtain 98 percent coverage in one pass are reviewed as to their induced residual stresses on SAE 5160 leaf spring coupons. Ten coupons were shot peened with each shot size in the intensity range of 5C to 14C. Random coupons were then checked for residual stress by x-ray diffraction analysis to a depth of .350mm. Curves were then plotted showing residual stress versus depth below the surface for each coupon. A comparison can then be made of coupons for each shot size and shot intensity as to the residual stresses. The date was then analyzed mathematically to confirm the conclusions inferred by the composite curves. Cubic parabola regression equations are used to closely predict the measured stress value. The regression curves, plotted from the calculated stress values are compared to the measured stress for each coupon. Descriptors: Shot peening; Steel; Residual stress; X-ray diffraction; Regression equations; Fatigue