The Effect of Shot Peening Coverage on Residual Stress, Cold Work and Fatigue in a Ni-Cr-Mo Low Alloy Steel

Abstract

The underlying motivation for this work was to test the conventional wisdom that 100% coverage by shot peening is required to achieve full benefit in terms of compressive residual stress magnitude and depth as well as fatigue strength. Fatigue performance of many shot peened alloys is widely reported to increase with coverage up to 100%, by many investigators and even in shot peening manuals.(1) The fatigue strength of some alloys is reported to be reduced by excessive coverage(2) Aerospace(3,4), automotive(5), and military(6) shot peening specifications require at least 100% coverage. Internal shot peening procedures of aerospace manufacturers may require 125% to 200% coverage. Most of the published fatigue data supporting the 100% minimum coverage recommendation was developed in fully reversed axial loading(2,7) or bending(8,9 ) with a stress ratio, R= Smin / Smax, of -1.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2000
Accession Number
ADA444574

Entities

People

  • J. T. Cammett
  • P. S> Prevey

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Alloys
  • Cold Working
  • Diffraction
  • Fatigue Life
  • Heat Treatment
  • Low Alloy Steels
  • Materials
  • Measurement
  • Mechanical Properties
  • Mechanical Working
  • Residual Stress
  • Residuals
  • Shot Peening
  • Steel
  • Stresses
  • Tensile Properties
  • Tensile Strength

Fields of Study

  • Materials science

Readers

  • Library and Information Science
  • Structural Health Monitoring of Composite Structures.

Technology Areas

  • Space