Subcycle fatigue crack growth mechanism investigation for aluminum alloys and steels

Jian Yang, Wei Zhang, Yongming Liu

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

Abstract

In this paper, the existence of crack closure and its sufficiency for crack growth prediction is investigated by multi-resolution in-situ optical microscopy experiment and SEM experiment. In in-situ optical microscopy testing, the digital image correlation analysis is used to measure the plastic zone size in front of the crack tip. In in-situ SEM testing, the crack tip opening displacement and the crack growth kinetics are investigated. Besides, crack closure behavior under constant loading with a single overload is studied in in-situ SEM test. This experimental methodology is applied to two different metallic materials (aluminum alloys and steels). Detailed imaging analysis and experimental results are presented and compared. It is found that first, there exists crack closure phenomena for aluminum alloys, but not for steels in our current researches; second, the crack closure will significantly change the crack tip plasticity behavior; third, the crack closure concept is able to account for crack growth kinetics uniquely for constant loading, but it is insufficient for constant loading with a single overload. Finally, the necessarily and the insufficiency of crack closure for crack growth prediction is discussed.

Original languageEnglish (US)
Title of host publication13th International Conference on Fracture 2013, ICF 2013
PublisherChinese Society of Theoretical and Applied Mechanics
Pages2010-2019
Number of pages10
Volume3
StatePublished - 2013
Event13th International Conference on Fracture 2013, ICF 2013 - Beijing, China
Duration: Jun 16 2013Jun 21 2013

Other

Other13th International Conference on Fracture 2013, ICF 2013
CountryChina
CityBeijing
Period6/16/136/21/13

Keywords

  • Crack closure
  • Crack growth
  • Fatigue
  • Overload
  • Plastic zone

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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  • Cite this

    Yang, J., Zhang, W., & Liu, Y. (2013). Subcycle fatigue crack growth mechanism investigation for aluminum alloys and steels. In 13th International Conference on Fracture 2013, ICF 2013 (Vol. 3, pp. 2010-2019). Chinese Society of Theoretical and Applied Mechanics.