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

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

Baldassarre, Alessandro (Clarkson University)
Martinez, Marcias (Clarkson University)
Rans, C.D. (TU Delft Structural Integrity & Composites)

2020-11-17

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.

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

http://resolver.tudelft.nl/uuid:c5d78868-ac61-4320-920a-106b68f5364c

https://doi.org/10.1080/00218464.2019.1598862

2021-09-30

0021-8464

The Journal of Adhesion, 96 (15), 1355-1384

Institutional Repository

review

© 2020 Alessandro Baldassarre, Marcias Martinez, C.D. Rans