Polarization-resolved terahertz imaging of intra- and inter-laminar damages in hybrid fiber-reinforced composite laminate subject to low-velocity impact

Terahertz imaging is applied to characterize a hybrid fiber-reinforced composite laminate subject to low-velocity impact in this study. The hybrid fiber-reinforced composite laminate comprises unidirectional glass/epoxy and carbon/epoxy plies with a cross-ply stack pattern. Both impact-induced intra...

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Bibliographic Details
Published in:Composites. Part B, Engineering Engineering, 2016-05, Vol.92, p.167-174
Main Authors: Dong, Junliang, Locquet, Alexandre, Declercq, Nico F., Citrin, D.S.
Format: Article
Language:English
Subjects:
A. Hybrid
A. Polymer-matrix composites (PMCs)
B. Impact behaviour
Bioengineering
Biomaterials
Carbon fiber reinforced plastics
D. Non-destructive testing
Damage
Engineering Sciences
Fiber composites
Fittings
Glass
Imaging
Laminates
Life Sciences
Terahertz imaging
Three dimensional
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Summary:Terahertz imaging is applied to characterize a hybrid fiber-reinforced composite laminate subject to low-velocity impact in this study. The hybrid fiber-reinforced composite laminate comprises unidirectional glass/epoxy and carbon/epoxy plies with a cross-ply stack pattern. Both impact-induced intra- and inter-laminar damages are successfully detected, and the damage evolution throughout the thickness is also evaluated. The interaction between the terahertz polarization and carbon-fiber orientation is investigated in detail. Inter-laminar damage at the interface and the intra-laminar damage close to the same interface can be differentiated via polarization-resolved imaging. With a parameter fitting method based on multiple regression analysis, delamination is characterized quantitatively. Terahertz C- and B-scan images clearly exhibit the propagation of the damage from the top to the bottom surface in three dimensions.
ISSN:1359-8368
1879-1069
DOI:10.1016/j.compositesb.2016.02.016