Synchrotron strain mapping of the residual strain distribution around foreign object damage in laser shock peened Ti-6AL-4V alloy

S. Zabeen, M. Preuss, P. J. Withers, S. Spanrad, J. Tong, J. Schofield

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

5 Citations (Scopus)

Abstract

The current study investigates the effect of foreign object damage (FOD) on the preexisting compressive residual stress field associated with laser shock peening (LSP) and its evolution upon combined LCF/HCF cycling. FOD was introduced onto an aerofoil-shaped specimen that had been previously LSP treated through ballistic impacts at angles of 0° and 45° to the leading edge. It is shown that the FOD notch created by 45° impact was asymmetric in shape and smaller in depth compared to that created at 0° impact. Significant through thickness compression was introduced parallel to the leading edge as a result of the LSP process. The residual strain distribution was mapped around the FOD notch by synchrotron X-ray radiation. The results show predominantly compressive stresses ahead of the notch, being greater for the 0° compared to 45° impact. No significant stress relaxation was observed after a combined (1000 HCF cycles superimposed on 1 LCF cycle) cycle.

Original languageEnglish
Title of host publicationMechanical Stress Evaluation by Neutrons and Synchrotron Radiation
PublisherTrans Tech Publications
Pages19-24
Number of pages6
ISBN (Print)0878492585, 9780878492589
DOIs
Publication statusPublished - 2010
Externally publishedYes
EventInternational Conference on Mechanical Stress Evaluation by Neutrons and Synchrotron Radiation (MECA SENS V) - Mito, Japan
Duration: 10 Nov 200912 Nov 2009
Conference number: 5th

Publication series

NameMaterials Science Forum
Volume652
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

ConferenceInternational Conference on Mechanical Stress Evaluation by Neutrons and Synchrotron Radiation (MECA SENS V)
Abbreviated titleMECA SENS V
CountryJapan
CityMito
Period10/11/0912/11/09

Keywords

  • Foreign object damage (FOD)
  • Laser Shock Peening (LSP)
  • LCF/HCF
  • Residual stress
  • Ti-6Al-4V

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