4 Citations (Scopus)

Abstract

A new fatigue crack growth model at the subcycle scale is proposed for both positive and negative stress ratios. The term "subcycle" refers to the crack growth modeling within a cyclic loading duration rather than the classical cycle averaged crack growth rate (i.e., da/dN). The proposed model includes two major components: a subcycle crack growth rate function and a crack opening stress estimation algorithm for tension-tension and tension-compression cyclic loading. The subcycle crack growth rate function is proposed based on existing in situ scanning electron microscopy testing results. Following this, separation of far field crack contact and near tip crack contact are discussed for both positive and negative stress ratios. A simple linearized model is proposed to estimate the crack opening stress. The developed simplified crack opening stress estimation model is compared with several other models available from open literatures. Next, the proposed subcycle fatigue crack growth methodology is validated with several sets experimental data for various metallic materials under different positive and negative stress ratios. Some discussions and conclusions are drawn based on the proposed model.

Original languageEnglish (US)
JournalEngineering Fracture Mechanics
DOIs
StateAccepted/In press - Jan 1 2017

Fingerprint

Fatigue crack propagation
Crack propagation
Cracks
Crack tips
Compaction
Scanning electron microscopy
Testing

Keywords

  • Crack closure
  • Fatigue crack growth
  • Stress ratio
  • Subcycle

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Subcycle fatigue crack growth formulation under positive and negative stress ratios. / Venkatesan, Karthik Rajan; Liu, Yongming.

In: Engineering Fracture Mechanics, 01.01.2017.

Research output: Contribution to journalArticle

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KW - Crack closure

KW - Fatigue crack growth

KW - Stress ratio

KW - Subcycle

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