An incremental crack growth model for multi-scale fatigue analysis

Zizi Lu, Yongming Liu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations

Abstract

A new fatigue crack growth formulation at the small time scale is proposed in this paper. This method is different from the traditional cycle-based fatigue formulation and is based on the incremental crack growth at any time instant during a cycle. It can be used for fatigue analysis at various time and length scales and is very convenient for the fatigue analysis under random variable amplitude loading without cycle-counting. The proposed model only requires basic material mechanical properties to develop the shape and magnitude of the traditionally used curve. Stress ratio and near-threshold crack growth behavior are included in the proposed methodology. In the proposed methodology, the reversed plastic zone concept and the crack closure concept is adopted to determine the lower integration limit in a single load cycle, respectively. Both approaches have been investigated and their advantages and disadvantages are discussed in detail. The proposed methodology is validated with extensive experimental observations for various metallic materials. Very good agreements with experimental data are observed. Error analysis and statistical testing are employed to compare the accuracy of the crack closure model and the reversed plastic zone model.

Original languageEnglish (US)
Title of host publication50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
StatePublished - Dec 1 2009
Externally publishedYes
Event50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference - Palm Springs, CA, United States
Duration: May 4 2009May 7 2009

Publication series

NameCollection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
ISSN (Print)0273-4508

Other

Other50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
CountryUnited States
CityPalm Springs, CA
Period5/4/095/7/09

ASJC Scopus subject areas

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

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  • Cite this

    Lu, Z., & Liu, Y. (2009). An incremental crack growth model for multi-scale fatigue analysis. In 50th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference [2009-2625] (Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference).