A multi-resolution experimental methodology for fatigue mechanism verification of physics-based prognostics

Jian Yang, Wei Zhang, Yongming Liu

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

Abstract

An experimental methodology is proposed in this paper for mechanism verification of physics-based prognosis of mechanical damage, such as fatigue. The proposed experimental methodology includes multi-resolution in-situ mechanical testing, advanced imaging analysis, and mechanism analysis based on digital measurements. A case study is presented for fatigue crack growth mechanism investigation. In-situ fatigue testing at lower resolutions, i.e., optical microscopy, and digital image correlation is used to analyze the plastic deformation behavior and strain distribution near crack tips. In-situ fatigue testing under higher resolutions, i.e., scanning electron microscopy, and automatic image tracking is used to obtain detailed crack tip deformation and crack growth kinetics at the nanometer scales. Following this, the proposed experimental methodology is applied to two different metallic materials, aluminum alloys and steels. Very different experimental observations are observed and the underlying mechanisms are discussed in detail. The impact on the prognosis algorithm development is also discussed. Finally, the potential application of the proposed experimental methodology to other materials systems and to other types of mechanical damage is discussed.

Original languageEnglish (US)
Title of host publicationProceedings of the Annual Conference of the Prognostics and Health Management Society 2012, PHM 2012
EditorsIndranil Roychoudhury, Jose R. Celaya, Abhinav Saxena
PublisherPrognostics and Health Management Society
Pages276-284
Number of pages9
ISBN (Electronic)9781936263059
StatePublished - Jan 1 2012
Externally publishedYes
Event2012 Annual Conference of the Prognostics and Health Management Society, PHM 2012 - Minneapolis, United States
Duration: Sep 23 2012Sep 27 2012

Publication series

NameProceedings of the Annual Conference of the Prognostics and Health Management Society 2012, PHM 2012

Other

Other2012 Annual Conference of the Prognostics and Health Management Society, PHM 2012
CountryUnited States
CityMinneapolis
Period9/23/129/27/12

ASJC Scopus subject areas

  • Information Systems
  • Electrical and Electronic Engineering
  • Health Information Management
  • Computer Science Applications

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  • Cite this

    Yang, J., Zhang, W., & Liu, Y. (2012). A multi-resolution experimental methodology for fatigue mechanism verification of physics-based prognostics. In I. Roychoudhury, J. R. Celaya, & A. Saxena (Eds.), Proceedings of the Annual Conference of the Prognostics and Health Management Society 2012, PHM 2012 (pp. 276-284). (Proceedings of the Annual Conference of the Prognostics and Health Management Society 2012, PHM 2012). Prognostics and Health Management Society.