Elastic strains around cracked cold-expanded fastener holes measured using the synchrotron X-ray diffraction technique

D. Stefanescu, A. Steuwer, R. A. Owen, B. Nadri, L. Edwards, M. E. Fitzpatrick, P. J. Withers

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

In this work, the capability of the synchrotron X-ray diffraction technique to measure changes in the residual strains caused by fatigue crack growth from cold-expanded holes in an aluminium alloy plate has been investigated. The measurement technique was validated by comparing the synchrotron measurements around uncracked holes with those obtained on similar specimens using the neutron diffraction and Sachs' techniques. Measurements were performed with and without superimposed tensile mechanical loading and the results compared with analytical results. The improved spatial resolution of the synchrotron technique relative to the other methods has allowed the strain fields around a fatigue crack growing from a cold-expanded hole to be evaluated in the unloaded state and at two loading levels. Only at the higher load does the crack appear to open along its full length.

Original languageEnglish
Pages (from-to)459-469
Number of pages11
JournalJournal of Strain Analysis for Engineering Design
Volume39
Issue number5
DOIs
Publication statusPublished - 1 Jul 2004
Externally publishedYes

Keywords

  • Cold-expanded hole
  • Fatigue cracking
  • Residual strain
  • Synchrotron X-ray diffraction

ASJC Scopus subject areas

  • Modelling and Simulation
  • Mechanics of Materials
  • Mechanical Engineering
  • Applied Mathematics

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