Crack growth-based fatigue-life prediction using an equivalent initial flaw model. Part II: Multiaxial loading

Zizi Lu, Yibing Xiang, Yongming Liu

Research output: Contribution to journalArticle

32 Scopus citations


A general methodology is proposed in this paper for fatigue-life prediction using crack growth analysis. This is the part II of the paper and focuses on the fatigue-life prediction under proportional and nonproportional multiaxial loading. The proposed multiaxial fatigue-life prediction is based on a critical plane-based multiaxial fatigue damage model and the Equivalent Initial Flaw Size (EIFS) concept. An equivalent stress intensity factor under general multiaxial proportional and nonproportional loading is defined. The fatigue life is predicted by integration of the crack growth rate curve from the EIFS to the critical crack length. The proposed model can automatically adapt for different materials experiencing different local failure modes. The numerical fatigue-life prediction results calculated by the proposed approach are validated with experimental data for a wide range of metallic materials available in the literature. Reasonable agreements are observed between the model predictions and the experimental observations under proportional and nonproportional loading.

Original languageEnglish (US)
Pages (from-to)376-381
Number of pages6
JournalInternational Journal of Fatigue
Issue number2
StatePublished - Feb 1 2010
Externally publishedYes



  • Crack growth
  • Critical plane
  • EIFS
  • Life prediction
  • Multiaxial fatigue

ASJC Scopus subject areas

  • Modeling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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