Residual strain distribution around a fatigue-crack tip determined by neutron diffraction

E-Wen Huang*, Kuan Wei Li, Soo Yeol Lee, Wanchuck Woo, Yi Shiun Ding, Leu Wen Tsay, Chung Hao Chen

*Corresponding author for this work

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

1 Scopus citations

Abstract

An analysis of residual stress, one of the contributory factors to the crack tip driving force, is extremely important to probe the fatigue crack growth mechanism and to further develop the life prediction methodology. Since fatigue crack growth is governed by crack-tip plasticity and crack closure in the wake of the crack tip, the investigation of residual stain/stress field in both behind and in front of the crack tip is crucial. In the current work, a 304L stainless steel compact-tension specimen is pre-cracked under constant-amplitude cyclic loading. Neutron diffraction is employed to directly measure the three orthogonal residual strain fields with 1-mm spatial resolution as a function of distance from the crack tip. The mapping results show that the three orthogonal residual-strain distributions around the crack tip depend on the stress multiaxiality, not following a single Poisson relationship to each axis.

Original languageEnglish
Title of host publicationTHERMEC 2011
Pages1685-1689
Number of pages5
DOIs
StatePublished - 30 Jan 2012
Event7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011 - Quebec City, QC, Canada
Duration: 1 Aug 20115 Aug 2011

Publication series

NameMaterials Science Forum
Volume706-709
ISSN (Print)0255-5476

Conference

Conference7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011
CountryCanada
CityQuebec City, QC
Period1/08/115/08/11

Keywords

  • Crack growth
  • Crack tip
  • Fatigue
  • Neutron diffraction
  • Strain

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