Hypotheses verification of a novel multi-scale fatigue damage prognosis model

W. Zhang, Y. Liu

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


In this paper, a new formulation at the small time scale is proposed for multi-scale fatigue crack growth analysis and an in-situ SEM testing methodology is used to verify the basic hypotheses of the model. Very high resolution imaging analysis is performed to quantify the crack tip deformation behaviour and crack growth kinetics. In the in-situ SEM testing, the crack closure phenomenon is observed during the crack growth process. It is also observed that crack growth is not uniformly distributed within a loading cycle and only happens during a small portion of loading path. Based on the experimental measurement, the new prognosis model is developed and shows a good agreement with coupon level fatigue crack growth testing data under both constant loading and simple variable loading.

Original languageEnglish (US)
Title of host publication2011 Aerospace Conference, AERO 2011
StatePublished - May 13 2011
Externally publishedYes
Event2011 IEEE Aerospace Conference, AERO 2011 - Big Sky, MT, United States
Duration: Mar 5 2011Mar 12 2011

Publication series

NameIEEE Aerospace Conference Proceedings
ISSN (Print)1095-323X


Other2011 IEEE Aerospace Conference, AERO 2011
Country/TerritoryUnited States
CityBig Sky, MT


  • CTOD
  • In-situ SEM
  • crack closure
  • crack growth
  • fatigue

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science


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