Fatigue reliability prediction of defective materials based on a useful equivalent Wöhler curve

  • Maroua Saggar
  • Chokri Bouraoui
  • Anouar Nasr


The purpose of this manuscript consists in suggesting an approach able to predict the reliability of the fatigue behavior devoted to defective material. A multiaxial high cycle fatigue criterion is adopted and improved by taking into account the 3D stress gradient effect around a defect. An equivalent multiaxial stress is figured out and reported in a useful SN curve. The proposed approach gives a more secure prediction of polycyclic fatigue behavior by coupling FE analysis and Monte Carlo reliability from which practical Iso-probabilistic SN curves are deduced. An application has been made with defective C35 steel. It has been noted that the findings are in good accord with the experimental investigation and leads to a greater reliable high cycle fatigue forecasting compared to the deterministic results. This method has also been used to analyze and discuss the impact of the defect on the fatigue behavior of the structure. This coupling Fatigue reliability gives an attractive and a strong engineering fatigue forecasting for design office.


Defects SN equivalent curve Iso-probabilistic S–N curves Monte Carlo simulation Finite element analysis 


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© Springer-Verlag London Ltd., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Laboratory of Mechanics of Sousse, National Engineering School of SousseUniversity of SousseSousseTunisia
  2. 2.LGM, IPEIM, ENIMUniversité de MonastirMonastirTunisia

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