Experimental investigation of random loading sequence effect on fatigue crack growth

Zizi Lu, Yongming Liu

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

An experimental study is proposed to investigate the effect of random loading sequence effect on the fatigue crack growth behavior of Al 7075-T6. The testing matrix includes different overload cycle percentage, overload ratios, and deterministic and random loading sequences in the current investigation. Multiple specimen tests and statistical data analysis are performed to show the effect of random loading sequence on the median and scatter behavior of fatigue crack growth. The proposed experimental study suggests that extreme value distribution is a good approximation of fatigue life distribution. It is observed that the effect of uncertain loading is different under different loading spectrums. For high overload cycle percentage spectrums, the random loading sequence has no major impact on the probabilistic crack growth behavior compared to the deterministic loading sequence with identical load cycle distributions. For low overload cycle percentage spectrums, the random loading sequence has huge impact on the probabilistic crack growth behavior compared to the deterministic loading sequence with identical load cycle distributions, for both the median and the scatter of the fatigue crack length curves. Finally, all experimental observations are reported in table format in Appendix A for future numerical model development and validation for interested readers.

Original languageEnglish (US)
Pages (from-to)4773-4785
Number of pages13
JournalMaterials and Design
Volume32
Issue number10
DOIs
StatePublished - Dec 2011
Externally publishedYes

Keywords

  • Fatigue
  • Fracture
  • Non-ferros metals and alloys

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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