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Stability of shot peening induced residual stresses and their influence on fatigue lifetime
Chalmers University of Technology, Department of Materials and Manufacturing Technology.
Chalmers University of Technology, Department of Materials and Manufacturing Technology.
University West, Department of Engineering Science, Division of Production Engineering.ORCID iD: 0000-0003-2560-0531
2011 (English)In: Materials Science and Engineering A, Vol. 528, no 3, p. 1008-1015Article in journal (Refereed) Published
Abstract [en]

Mechanical surface treatment methods such as shot peening may improve the fatigue strength of materials. In this study, the effect of shot peening on strain controlled constant amplitude fatigue loading of a near pearlitic microalloyed steel was investigated. The stress amplitudes throughout the whole lifetime were followed, in addition to detailed recording of stress-strain hysteresis loops, particularly at small cycle numbers. The detailed relaxation of residual stresses and the changes in full width of half maximum (FWHM) of the X-ray peak at the surface and in depth as function of the number of cycles and plastic strain were recorded. By these techniques, the onset as well as the rate of relaxation of residual stresses could be followed at different strain amplitudes. Pronounced increase in lifetime of the shot peened specimens tested at total strain amplitude smaller than 0.3% (corresponding to 0.034% plastic strain amplitude) was achieved. This coincides with reasonably stable residual stresses at the surface and in depth. © 2010 Elsevier B.V.

Place, publisher, year, edition, pages
2011. Vol. 528, no 3, p. 1008-1015
Keywords [en]
Fatigue, Micro alloyed steel, Relaxation, Residual stress, Work hardening, Alloyed steels, Constant amplitude, Cycle number, Fatigue lifetime, Fatigue loadings, Full width of half maximum, Mechanical surface treatment, Microalloyed Steel, Number of cycles, Plastic strain, Rate of relaxation, Strain amplitude, Stress amplitudes, Stress-strain hysteresis loops, Total strain amplitude, X-ray peaks, Building materials, Fatigue of materials, Hysteresis, Hysteresis loops, Plastic deformation, Shot peening, Strain hardening, Surface treatment, Residual stresses
National Category
Production Engineering, Human Work Science and Ergonomics
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-2983DOI: 10.1016/j.msea.2010.09.050ISBN: 09215093 (ISSN) (print)OAI: oai:DiVA.org:hv-2983DiVA, id: diva2:384032
Available from: 2011-01-07 Created: 2011-01-07 Last updated: 2014-04-30Bibliographically approved

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Svensson, L. E.

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