Preload relaxation characteristics in composite bolted joints based on vibration fatigue test

Zhen Zhang, Yi Xiao, Yanqing Liu, Zhongqing Su

Research output: Journal article publicationJournal articleAcademic researchpeer-review

16 Citations (Scopus)


All right reserved. The time-dependent behavior and the affecting factors of preload relaxation in carbon/epoxy composite bolted joint have been studied, through a forced bending vibration test included various initial preloads and excitation frequencies. Analysis method and test method, based on modal parameters (resonance frequency and damping ratio), were utilized to characterize the dynamic property of bolted joints. It is observed that the loss degree of preload will increase with decreasing initial preload, and it will increase with the exciting frequency increasing, over a period of 10 h vibration fatigue process. Vibration fatigue damages would result in stiffness decay and damping increase in structural joints; the relaxation in composite bolted joints can be attributed to the conjunct mechanisms between viscoelastic behavior of materials and interface friction of which about 50% of relaxation is due to viscoelastic effect of composites.
Original languageEnglish
Pages (from-to)163-173
Number of pages11
JournalFuhe Cailiao Xuebao/Acta Materiae Compositae Sinica
Issue number1
Publication statusPublished - 1 Jan 2016


  • Bolted joints
  • Composite structures
  • Damping ratio
  • Long-term durability
  • Preload relaxation
  • Vibration fatigue

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Mechanics of Materials


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