Analysis of fatigue damage of aluminium alloy under multiaxial random vibration

Junji Sakamoto, Tadahiro Shibutani

Research output: Contribution to journalConference article

Abstract

Many studies have investigated the fatigue damage of materials under vibration. However, the mechanism of vibration-induced fatigue damage remains unclear, and no method has been established for evaluating the vibration fatigue strength. Therefore, it is important to establish an evaluation method for the vibration fatigue strength of materials to ensure appropriate strength in their design. In this study, we performed experiments to investigate the fracture mechanism of a material under multi-axial random vibration. We selected aluminium alloy A5056 as the test material and employed button-head-type specimens with a notch. The multi-axial random vibration experiments were performed at different acceleration inputs (10, 20, 30, 40, 50, 60, and 70 G rms ) within a frequency band of 10-5000 Hz. During the vibration tests, we conducted observations of vibration behaviour. After the vibration tests, we observed the fracture surfaces of the specimens using a scanning electron microscope. The results show that the fatigue fracture was due to the bending resonance mode for the given shape and dimensions of the specimens used in this study. In addition, cracks initiated at different areas on the fracture surface and later propagated; subsequently, the cracks coalesced. Finally, we discussed whether the fatigue life of materials subjected to vibration can be predicted using finite element analysis.

Original languageEnglish
Pages (from-to)529-534
Number of pages6
JournalProcedia Structural Integrity
Volume13
DOIs
Publication statusPublished - Jan 1 2018
Externally publishedYes
Event22nd European Conference on Fracture, ECF 2018 - Belgrade, Serbia
Duration: Aug 25 2018Aug 26 2018

Keywords

  • Aluminium alloy
  • Fatigue damage
  • Multi-axis
  • Random vibration

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Civil and Structural Engineering
  • Materials Science(all)

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