Polarization-resolved terahertz imaging of intra- and inter-laminar damages in hybrid fiber-reinforced composite laminate subject to low-velocity impact. (1st May 2016)

• Record Type: Journal Article
• Authors: Dong, Junliang; Locquet, Alexandre; Declercq, Nico F.; Citrin, D.S.
• Is Part Of: Composites. Volume 92(2016)
• Page Start: 167
• Page End: 174
• Publication Date: 2016-05-01
• Subjects: D. Non-destructive testing -- A. Hybrid -- A. Polymer-matrix composites (PMCs) -- B. Impact behaviour -- Terahertz imaging; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2016.02.016
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: 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.