Subcycle fatigue crack growth mechanism investigation for aluminum alloys and steel (special session on the digital twin)

Jian Yang, Wei Zhang, Yongming Liu

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

1 Scopus citations

Abstract

An experimental investigation of the subcycle fatigue crack growth mechanisms at different scales is proposed in this paper for aluminum alloy and steel using in-situ mechanical testing and imaging analysis. At lower resolution, digital images are taken with optical microscopy at the micrometer scale. Digital image correlation is used to get the strain distribution in front of the crack tip to analyze the plastic deformation behavior. At higher resolution, images are taken with scanning electron microscopy at the nanometer scale. Automatic image tracking is used to obtain detailed crack tip deformation and crack growth. The epxrimental study is performed for two types of metallic materials, i.e., aluminum 7075-T6 and ANSI 4340 steel. Crack closure is observed in allumnium materials, but not in steels. Their plastic zone variation shows very different behavior under constant amplitude loadings. The underlying mechanism is discussed. Finally, the potential application of the proposed investigation method to other materials and to other types of mechanical damage is discussed.

Original languageEnglish (US)
Title of host publication54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
DOIs
Publication statusPublished - 2013
Event54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference - Boston, MA, United States
Duration: Apr 8 2013Apr 11 2013

Other

Other54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
CountryUnited States
CityBoston, MA
Period4/8/134/11/13

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ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanics of Materials
  • Building and Construction
  • Architecture

Cite this

Yang, J., Zhang, W., & Liu, Y. (2013). Subcycle fatigue crack growth mechanism investigation for aluminum alloys and steel (special session on the digital twin). In 54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference https://doi.org/10.2514/6.2013-1499