Investigating the performances of stepwise patched double lap joint

Wen Yen Chuang, Jia-Lin Tsai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


An adhesive-bonded double-lap composites joint with stepwise attachments was proposed and investigated experimentally and numerically in this study. For the conventional double lap joint (DLJ), the high shear stress and peel stress taking place in the adhesive layer near the patch termination significantly influenced the joint strength. In order to diminish the amount of the stresses, a new design of stepwise patch was introduced in the fabrication of the double-lap joint. Based on the finite element stress analysis (FEA), it was found that both shear stress and peel stress within the adhesive layer were reduced appreciably by the employment of the stepwise attachment. In addition, experimental results illustrated that the double lap joint with stepwise patch exhibited not only higher joint strength, but also it showed longer fatigue life than the conventional double lap joints.

Original languageEnglish
Pages (from-to)44-50
Number of pages7
JournalInternational Journal of Adhesion and Adhesives
StatePublished - 8 Feb 2013


  • Composites
  • Fatigue
  • Finite element stress analysis
  • Joint design

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