In-situ optical microscopy study on plastic zone size estimation of aluminum alloy 7075-T6 under cyclic loading

Wei Zhang, Zizi Lu, Yongming Liu

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

4 Scopus citations

Abstract

An in-situ optical microscopy fatigue testing is proposed in this paper to investigate the forward and reversed plastic zone under cyclic tensile loading. During the testing, every loading cycle is divided into a certain number of steps. Images of the crack tip are taken at each step. The full strain field around the crack tip is then determined using the digital image correlation (DIC) technique. The plastic zone size is obtained combining the DlC results and the material constitutive relationship. Experimental measurements are compared with theoretical predictions. It is observed that the crack closure effect has a large effect on the reversed plastic zone size. The plastic zone size remains almost constant when the unloading path is beyond a certain stress level. A modified model is proposed to estimate the crack tip plastic zone variation based on the experimental observations.

Original languageEnglish (US)
Title of host publicationFatigue of Materials
Subtitle of host publicationAdvances and Emergences in Understanding, Held During Materials Science and Technology 2010, MS and T'10
Pages419-429
Number of pages11
StatePublished - Dec 1 2010
Externally publishedYes
EventFatigue of Materials: Advances and Emergences in Understanding, Held During Materials Science and Technology 2010, MS and T'10 - Houston, TX, United States
Duration: Oct 17 2010Oct 21 2010

Publication series

NameFatigue of Materials: Advances and Emergences in Understanding, Held During Materials Science and Technology 2010, MS and T'10

Other

OtherFatigue of Materials: Advances and Emergences in Understanding, Held During Materials Science and Technology 2010, MS and T'10
CountryUnited States
CityHouston, TX
Period10/17/1010/21/10

Keywords

  • Fatigue
  • Image correlation
  • Optical microscopy
  • Plastic zone

ASJC Scopus subject areas

  • Materials Chemistry

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  • Cite this

    Zhang, W., Lu, Z., & Liu, Y. (2010). In-situ optical microscopy study on plastic zone size estimation of aluminum alloy 7075-T6 under cyclic loading. In Fatigue of Materials: Advances and Emergences in Understanding, Held During Materials Science and Technology 2010, MS and T'10 (pp. 419-429). (Fatigue of Materials: Advances and Emergences in Understanding, Held During Materials Science and Technology 2010, MS and T'10).