A physically short fatigue crack growth approach based on low cycle fatigue properties

S. C. Wu, Z. W. Xu, C. Yu, O. L. Kafka, W. K. Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

This work proposes an improved and simplified fatigue life equation called LAPS, formulated from low cycle fatigue data of smooth specimens and the Rice-Kujawski-Ellyin asymptotic field, with proper crack opening functions for closure effects. The model captures both long and physically short fatigue crack growth behavior, but the emphasis of this contribution is on the modifications for physically short cracks based on empirical models found in the literature. The predictions for physically short cracks from this model coincide well with experimental data for the railway axle used steel 25CrMo4. The predictions for long cracks match well with data from a variety of different metals. This makes the model a suitable alternative, e.g. to NASGRO, for engineering applications.

Original languageEnglish (US)
Pages (from-to)185-195
Number of pages11
JournalInternational Journal of Fatigue
Volume103
DOIs
StatePublished - Oct 2017

Keywords

  • Crack-tip singular field
  • Fatigue crack propagation rate
  • Low cycle fatigue
  • NASGRO equation
  • Physically fatigue short cracks

ASJC Scopus subject areas

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

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