Fatigue behaviour of defective cast iron

Marton Groza, Yves Nadot, K. Váradi

Research output: Contribution to journalArticle

Abstract

With the analysis example of a cast iron component a Finite Element Analysis (FEA) based modelling and post-processing methodology is proposed for the multiaxial high-cycle fatigue assessment of surface defects. Methods are proposed for the measurement and mechanical description of surface defects using an ellipsoid simplification and the well-known size parameter from Murakami (2002). Different methods are compared for the stress-computation near surface defects: elastic FEA, elastic-plastic FEA with nonlinear kinematic hardening material model, and analytical calculations with the Equivalent Inclusion Method from Eshelby (1957). The Defect Stress Gradient (DSG) approach from Vincent et al. (2014) is applied to predict crack initiation, whereby a new method is proposed for the estimation of the stress gradient, which allows the presentation of the DSG utilisation factor results field.

Original languageEnglish
Pages (from-to)438-445
Number of pages8
JournalProcedia Structural Integrity
Volume7
DOIs
Publication statusPublished - Jan 1 2017

    Fingerprint

Keywords

  • crack initiation
  • FEA
  • multiaxial fatigue
  • nodular cast iron
  • stress gradient
  • surface defects

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Civil and Structural Engineering
  • Materials Science(all)

Cite this