Evaluation and visualization of multiaxial fatigue behavior under random non-proportional loading condition

Takahiro Morishita, Fumio Ogawa, Takamoto Itoh

Research output: Contribution to journalArticlepeer-review

Abstract

In cyclic multiaxial stress/strain condition under non-proportional loading in which principal direction of stress/strain are changed in a cycle, it becomes difficult to analyze stress/strain ranges because of complexity of multiaxial stress/strain states depending on time in cycles. In order to evaluate stress/strain simply and suitably under non-proportional loading, Itoh and Sakane have proposed a method called as IS-method and a strain parameter for life evaluation under non-proportional loading NP. In the method, 6-components of stress/strain are converted to an equivalent stress/strain indicating the amplitude and the direction of principal stress/strain as a function of time as well as an intensity of loading non-proportionality fNP. Based on IS-method, the authors also have developed a tool which enables to analyze multiaxial stress/strain condition with the non-proportionality of loading history and evaluate failure life under non-proportional multiaxial loading. The tool indicates the analyzed results on monitor and users can understand visually not only variation of the stress/strain conditions but also non-proportionality during the cycle, which helps the design of material strength.

Original languageEnglish
Pages (from-to)45-53
Number of pages9
JournalFrattura ed Integrita Strutturale
Volume11
Issue number41
DOIs
Publication statusPublished - 2017
Externally publishedYes

Keywords

  • Additional hardening
  • Analysis tool
  • Cycle counting
  • Life evaluation
  • Multiaxial fatigue
  • Non-proportional loading

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

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