On the cyclic J-integral of a 3D semi elliptical surface crack

Ross Beesley, Haofeng Chen, Martin Hughes

Research output: Contribution to conferencePaper

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Abstract

This paper investigates an approach for calculating the cyclic J-Integral (ΔJ) through a new industrial application. A previously proposed method is investigated further with the extension of this technique through a new application of a practical 3D notched component containing a semi-elliptical
surface crack. Current methods of calculating the cyclic J-Integral are identified and their limitations discussed. A modified monotonic loading method is adapted to calculate the cyclic J- integral of this 3D Semi Elliptical Surface Crack under cyclic loading conditions. Both the finite element method (FEM) and the Extended Finite Element Method (XFEM) are discussed as possible methods of calculating the cyclic J-Integral in this investigation. Different loading conditions including uni-axial tension and out of plane shear are applied, and the relationships between the applied loads and the cyclic J-integral are established. In addition, the variations of the cyclic J-integral along the crack front are investigated. This allows the critical load that can be applied before crack propagation occurs to be determined as well as the identification of the critical crack direction once propagation does occur. These calculations display the applicability of the method to practical examples and illustrate an accurate method of estimating the cyclic J-integral.
Original languageEnglish
Number of pages9
Publication statusPublished - 20 Jul 2014
EventASME Pressure Vessels and Piping Conference 2014 - California, Anaheim, United States
Duration: 20 Jul 201424 Jul 2014

Conference

ConferenceASME Pressure Vessels and Piping Conference 2014
CountryUnited States
CityAnaheim
Period20/07/1424/07/14

Keywords

  • crack
  • J-integral
  • cyclic J-integral
  • fracture mechanics
  • FEA
  • XFEM

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