Residual stress evaluation of adhesively bonded composite using central cut plies specimens

Alessandro Baldassarre, Marcias Martinez, Calvin Rans

Research output: Contribution to journalReview articleScientificpeer-review

Abstract

The present study reports on the evaluation of residual stress field formation and distribution in Central Cut Plies (CCP) specimens. Real-time measurements were performed using a distributed sensing fiber optic system based on Rayleigh Backscattering, which was successfully able to capture strain distribution inside the adhesive layer at every 0.65 mm during the entire curing cycle, for both unidirectional and cross ply laminate configurations. A finite element analysis was also performed to cross-correlate with the experimental residual strain distributions in the proximity of the severed central cut plies. The results outlined in this study demonstrate the presences of tensile residual stresses within the adhesive layer for both configurations. A full field strain distribution and the significance of these findings in relation to the use of the CCP test for fracture mechanics testing will be discussed. Results of this study have shown that residual stresses arise after the curing process for which the amount of longitudinal and transverse residual stresses for the unidirectional CCP laminate are 61% and 19% of the total strength of the adhesive, respectively, while for the cross-ply CCP laminate are 72% and 71%, respectively.

Original languageEnglish
Pages (from-to)1355-1384
Number of pages30
JournalJournal of Adhesion
Volume96
Issue number15
DOIs
Publication statusPublished - 17 Nov 2020

Keywords

  • Bonded composite joints and repairs
  • central cut plies specimen
  • distributed sensing system
  • embedded optical fiber
  • residual stresses
  • strains monitoring

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