Study on fatigue behavior of strengthened non-load-carrying cruciform welded joints using carbon fiber sheets

Tao Chen, Qian Qian Yu, Xiang Lin Gu, Xiao Ling Zhao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

48 Citations (Scopus)

Abstract

This paper reports an experimental study on the use of carbon fiber-reinforced polymer (CFRP) sheets to strengthen non-load-carrying cruciform welded joints subjected to fatigue loading. Failure modes and corresponding fatigue lives were recorded during tests. Scatter of test results was observed. Thereafter, a series of numerical analyses were performed to study the effects of weld toe radius, the number of CFRP layers and Young's modulus of reinforced materials on local stress concentration at a weld toe. It was found that fatigue life of such welded connections can be enhanced because of the reduction of stress concentration caused by CFRP strengthening. Parametric study indicates that the weld toe radius and the amount of CFRP are the key parameters influencing the stress concentration factors and stress ranges of the joint. Enhancement of modulus for adhesive and CFRP sheets can also be beneficial to the fatigue performance to some extent.

Original languageEnglish
Pages (from-to)179-194
Number of pages16
JournalInternational Journal of Structural Stability and Dynamics
Volume12
Issue number1
DOIs
Publication statusPublished - Jan 2012
Externally publishedYes

Keywords

  • CFRP
  • fatigue
  • non-load-carrying cruciform welded joint
  • strengthening

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Aerospace Engineering
  • Ocean Engineering
  • Mechanical Engineering
  • Applied Mathematics

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