Total fatigue life analysis of a nodular cast iron plate specimen with a center notch

Márton Gróza, K. Váradi

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The crack initiation and propagation phases of the fatigue life of a plate specimen with a center hole are analyzed. The local transient stress–strain relationship is investigated by means of finite element simulations with a nonlinear kinematic hardening model. Modifications are proposed for the conventional notch analysis with the strain-life methodology considering the effect of mean stress relaxation and strain ratchetting. With the proposed modifications, the crack initiation life at the notch is less dependent on the load ratio, as it is in classic analysis methods. The initiated cracks are further investigated with fracture mechanics methods to evaluate total fatigue life. The eXtended finite element method and analytical formulas are applied to obtain the crack path and stress intensity factors, the results of which are in excellent agreement. Propagation life is estimated with the NASGRO crack-growth model fitted on the experimental results.

Original languageEnglish
JournalAdvances in Mechanical Engineering
Issue number12
Publication statusPublished - Dec 1 2017



  • crack initiation
  • crack propagation
  • eXtended finite element method
  • Nodular cast iron
  • notch root plasticity

ASJC Scopus subject areas

  • Mechanical Engineering

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