Experimental and finite element analysis on the response and failure of local sharp-dented 6061-t6 aluminum alloy tubes subjected to cyclic bending

Kuo Long Lee, Yi Fu Chiu, Wen Fung Pan

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

Abstract

In this paper, the response and failure of local sharp-dented 6061-T6 aluminum alloy tubes with different dent depths of 0.3, 0.6, 0.9 and 1.2 mm subjected to cyclic bending was experimentally investigated. The tube-bending machine and curvature-ovalization measurement apparatus were used for conducting the curvature-controlled cyclic bending experiments. It was observed that the moment-curvature relationship showed an almost steady loop from the beginning of the first cycle. However, the ovalization–curvature relationship exhibited an increasing and ratcheting way with the number of the bending cycles. In addition, a deeper dent depth of a tube led to a more severe asymmetrical trend of the ovalization–curvature relationship. It has been demonstrated that the dent depth has small influence on the moment–curvature relationship. But, it has a strong influence on the ovalization–curvature relationship. Next, using proper stress-strain relationship, model, mesh, boundary conditions and loading conditions, the finite element ANSYS was used to describe the moment-curvature and ovalization–curvature relationships. Because the failure type was the fatigue fracture, the ANSYS was used to calculate the maximum and minimum stresses for each cyclic bending case. Finally, a simple fatigue model was proposed for predicting the stress amplitude-number of bending cycles required to produce failure relationship. It was found that the experimental and analytical data agreed quite well.

Original languageEnglish
Title of host publicationComputational Methods and Experimental Measurements XVIII
EditorsG.M. Carlomagno, Y. Villacampa, S. Ivorra, C.A. Brebbia
PublisherWITPress
Pages137-148
Number of pages12
ISBN (Print)9781784662011
DOIs
Publication statusPublished - 2017
Event18th International Conference on Computational Methods and Experimental Measurements, CMEM 2017 - Alicante, Spain
Duration: 2017 Jul 42017 Jul 6

Publication series

NameWIT Transactions on Engineering Sciences
Volume118
ISSN (Print)1743-3533

Other

Other18th International Conference on Computational Methods and Experimental Measurements, CMEM 2017
CountrySpain
CityAlicante
Period17-07-0417-07-06

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Materials Science(all)
  • Mechanics of Materials
  • Fluid Flow and Transfer Processes
  • Electrochemistry

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