On the modified monotonic loading concept for the calculation of the cyclic j-integral

Ross Beesley, Haofeng Chen, Martin Hughes

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This paper investigates an approach for calculating the cyclic J-Integral 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 concept 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 uniaxial 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
Article number051406
Number of pages11
Journal Journal of Pressure Vessel Technology
Issue number5
Early online date5 Mar 2015
Publication statusPublished - 1 Oct 2015


  • surface cracks
  • finite elementmethod
  • cyclic J-integral
  • fracture mechanics
  • stress
  • XFEM
  • shear mechanical properties
  • crack propagation
  • tension

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