A study of loosening and fatigue failure of bolted joints under transverse vibration

Shinji Hashimura, Darrell F. Socie

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Loosening and fatigue failure of bolted joints are the two most important problems for vehicles that are subjected to vibration loading. Although many fatigue tests have been performed under axial vibration, there have been few tests under transverse vibration. In this study, loosening-fatigue tests under small transvers vibrations have been performed to understand bolt behavior for the long life region. Results show that if a bolt has loosened within 10 2∼103 vibration cycles, damage such as crack nucleation at the root of the first thread is not observed. However if loosening does not occur until approximately 104∼106 cycles, then a crack is observed at the root of the first thread in all experiments. Loosening occurs due to loss of axial stiffness caused by crack propagation which then leads to bolt rotation. The results also show that the loosening-fatigue life does not depend on the initial clamping force although the loosening-fatigue life significantly depends on the transverse vibration force.

Original languageEnglish
Pages (from-to)1297-1304
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Volume72
Issue number4
Publication statusPublished - 2006
Externally publishedYes

Fingerprint

Bolted joints
Fatigue of materials
Bolts
Cracks
Crack propagation
Nucleation
Stiffness
Experiments

Keywords

  • Bolted Joint
  • Clamping Force
  • Fatigue Failure
  • Loosening
  • Transverse Vibration

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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abstract = "Loosening and fatigue failure of bolted joints are the two most important problems for vehicles that are subjected to vibration loading. Although many fatigue tests have been performed under axial vibration, there have been few tests under transverse vibration. In this study, loosening-fatigue tests under small transvers vibrations have been performed to understand bolt behavior for the long life region. Results show that if a bolt has loosened within 10 2∼103 vibration cycles, damage such as crack nucleation at the root of the first thread is not observed. However if loosening does not occur until approximately 104∼106 cycles, then a crack is observed at the root of the first thread in all experiments. Loosening occurs due to loss of axial stiffness caused by crack propagation which then leads to bolt rotation. The results also show that the loosening-fatigue life does not depend on the initial clamping force although the loosening-fatigue life significantly depends on the transverse vibration force.",
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