Small time scale fatigue crack growth analysis under variable amplitude loading

Lu Zizi Lu, Yongming Liu

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

Abstract

In this paper, a previously developed fatigue crack growth model at the small time scale is modified and validated under f variable amplitude loading. This method is based on the incremental crack growth at any time instant during a cycle and can be used for fatigue analysis at various time and length scales. It does not require cycle counting and is very convenient for the fatigue analysis under random variable amplitude loading without cycle-counting. In the proposed methodology, the reversed plastic zone concept is adopted to determine the lower integration limit during the time integral for crack length calculation. Model validation is performed using extensive experimental observations for various metallic materials under different types of variable amplitude loading. Statistical error analysis is used to compare the proposed model with existing fatigue crack growth codes. Very good agreements are observed between model predictions and experimental observations. Predictions of the proposed model are compared with those of the FASTRAN and AFGROW codes and the error analysis for the predictions indicates the small scale model has an overall better accuracy in the current investigation.

Original languageEnglish (US)
Title of host publication51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
StatePublished - Dec 16 2010
Externally publishedYes
Event51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference - Orlando, FL, United States
Duration: Apr 12 2010Apr 15 2010

Publication series

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

Other

Other51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
CountryUnited States
CityOrlando, FL
Period4/12/104/15/10

ASJC Scopus subject areas

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

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  • Cite this

    Zizi Lu, L., & Liu, Y. (2010). Small time scale fatigue crack growth analysis under variable amplitude loading. In 51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference [2010-2861] (Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference).