Acceleration of fatigue crack growth due to occasional mode II loading in 7075 aluminum alloy

H. Matsunaga, M. Makizaki, D. F. Socie, K. Yanase, M. Endo

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The effect of an occasional mode II loading on the subsequent mode I fatigue crack growth was investigated in a thin-walled 7075-T6511 aluminum alloy tube. Careful observation of crack growth behavior revealed that an occasional mode II loading has two contrasting effects on the subsequent crack growth. First is a retardation effect that is associated with a crack closure development due to the mode II loading. However, this effect was insignificant with respect to the crack growth life as a whole. Second is an acceleration effect that is associated with an accelerated crack growth rate in mode II. It was found that, in a relatively high δ. K regime, mode II crack growth was from one to two orders of magnitude faster than mode I crack growth. This study shows that mode II crack growth should be considered as a predominant factor in evaluating the effect of an occasional mode II loading for a mode I crack in 7075 aluminum alloy.

Original languageEnglish
Pages (from-to)126-136
Number of pages11
JournalEngineering Fracture Mechanics
Volume123
DOIs
Publication statusPublished - Jun 2014

All Science Journal Classification (ASJC) codes

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

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