Obtaining the J-integral by diffraction-based strain mapping

S. M. Barhli, L Saucedo-Mora, C. Simpson, T. Becker, Mahmoud Mostafavi, Philip Withers, T. J. Marrow

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

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Abstract

The analysis by diffraction of crystalline materials can determine the full tensor of the elastic strains within them. Point-by-point maps of elastic strain can thus be obtained in engineering alloys, typically using synchrotron X-rays or neutrons. In this paper, a novel approach is presented to calculate the elastic strain energy release rate of a loaded crack from two-dimensional strain maps
that are obtained by diffraction. The method is based on a Finite Element approach, which uses diffraction data to obtain the parameters required to calculate the J-integral via the contour integral method. A validation of the technique is presented using a synthetic dataset from a finite element model. Its experimental application is demonstrated in an analysis of a synchrotron X-ray diffraction strain map for a loaded fatigue crack in a bainitic steel.
Original languageEnglish
Title of host publicationProcedia Structural Integrity
Subtitle of host publication21st European Conference on Fracture, ECF21
Pages2519-2526
Number of pages8
Volume2
Publication statusPublished - 2016
Event21st European Conference on Fracture - Catania, Italy
Duration: 20 Jun 201624 Jun 2016

Publication series

NameProcedia Structural Integrity
PublisherElsevier
Volume2
ISSN (Print)2452-3216

Conference

Conference21st European Conference on Fracture
Abbreviated titleECF21
Country/TerritoryItaly
CityCatania
Period20/06/1624/06/16

Keywords

  • J-integral
  • XRD
  • diffraction
  • EDXD
  • Stress-Intensity Factor
  • strain mapping

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