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The effect of residual stresses arising from laser shock peening on fatigue crack growth

Chahardehi, A.; Brennan, F. P. and Steuwer, Axel LU (2010) 3rd International Conference on Crack Paths, 2009 In Engineering Fracture Mechanics 77(11). p.2033-2039
Abstract
Residual stresses have in the past been introduced to manipulate growth rates and shapes of cracks under cyclic loads. Previously, the effectiveness of shot peening in retarding the rate of fatigue crack growth was experimentally studied. It was shown that the compressive residual stresses arising from the shot peening process can affect the rate of crack growth. Laser shock peening can produce a deeper compressive stress field near the surface than shot peening. This advantage makes this technique desirable for the manipulation of crack growth rates. This paper describes an experimental program that was carried out to establish this effect in which steel specimens were partially laser peened and subsequently subjected to cyclic loading to... (More)
Residual stresses have in the past been introduced to manipulate growth rates and shapes of cracks under cyclic loads. Previously, the effectiveness of shot peening in retarding the rate of fatigue crack growth was experimentally studied. It was shown that the compressive residual stresses arising from the shot peening process can affect the rate of crack growth. Laser shock peening can produce a deeper compressive stress field near the surface than shot peening. This advantage makes this technique desirable for the manipulation of crack growth rates. This paper describes an experimental program that was carried out to establish this effect in which steel specimens were partially laser peened and subsequently subjected to cyclic loading to grow fatigue cracks. The residual stress fields generated by the laser shock peening process were measured using the neutron diffraction technique. A state of compressive stress was found near the surface and tensile stresses were measured in the mid-thickness of the specimens. Growth rates of the cracks were observed to be more affected by the tensile core than by the compressive surface stresses. (c) 2010 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Residual stress, Fatigue crack growth, Laser peening, diffraction, Neutron
in
Engineering Fracture Mechanics
volume
77
issue
11
pages
2033 - 2039
publisher
Elsevier
conference name
3rd International Conference on Crack Paths, 2009
external identifiers
  • wos:000280285800037
  • scopus:77954035730
ISSN
0013-7944
DOI
10.1016/j.engfracmech.2010.03.033
language
English
LU publication?
yes
id
2753fb1b-8ff5-4a5e-8766-25739fb8b4ad (old id 1656050)
date added to LUP
2010-08-25 15:49:21
date last changed
2018-06-03 04:09:55
@inproceedings{2753fb1b-8ff5-4a5e-8766-25739fb8b4ad,
  abstract     = {Residual stresses have in the past been introduced to manipulate growth rates and shapes of cracks under cyclic loads. Previously, the effectiveness of shot peening in retarding the rate of fatigue crack growth was experimentally studied. It was shown that the compressive residual stresses arising from the shot peening process can affect the rate of crack growth. Laser shock peening can produce a deeper compressive stress field near the surface than shot peening. This advantage makes this technique desirable for the manipulation of crack growth rates. This paper describes an experimental program that was carried out to establish this effect in which steel specimens were partially laser peened and subsequently subjected to cyclic loading to grow fatigue cracks. The residual stress fields generated by the laser shock peening process were measured using the neutron diffraction technique. A state of compressive stress was found near the surface and tensile stresses were measured in the mid-thickness of the specimens. Growth rates of the cracks were observed to be more affected by the tensile core than by the compressive surface stresses. (c) 2010 Elsevier Ltd. All rights reserved.},
  author       = {Chahardehi, A. and Brennan, F. P. and Steuwer, Axel},
  booktitle    = {Engineering Fracture Mechanics},
  issn         = {0013-7944},
  keyword      = {Residual stress,Fatigue crack growth,Laser peening,diffraction,Neutron},
  language     = {eng},
  number       = {11},
  pages        = {2033--2039},
  publisher    = {Elsevier},
  title        = {The effect of residual stresses arising from laser shock peening on fatigue crack growth},
  url          = {http://dx.doi.org/10.1016/j.engfracmech.2010.03.033},
  volume       = {77},
  year         = {2010},
}