MWNT-Doped Epoxy Matrix for Detecting Impact Damages in Fiber Reinforced Composites by Electrical Resistance Measurements

2010 ◽  
Author(s):  
Marco Monti ◽  
Maurizio Natali ◽  
Josè M. Kenny ◽  
Luigi Torre ◽  
A. D’Amore ◽  
...  
Keyword(s):  
Electrical Resistance ◽  
Epoxy Matrix ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Electrical Resistance Measurements ◽  
Impact Damages

scholarly journals Terahertz and Thermal Testing of Glass-Fiber Reinforced Composites with Impact Damages

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
T. Chady ◽  
P. Lopato ◽  
B. Szymanik
Keyword(s):  
Harmonic Analysis ◽  
Glass Fiber ◽  
Experimental Methods ◽  
Fiber Reinforced Composites ◽  
Thermal Testing ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Active Thermography ◽  
Glass Fiber Reinforced ◽  
Impact Damages

The studies on glass-fiber reinforced composites, due to their growing popularity and high diversity of industrial applications, are becoming an increasingly popular branch of the nondestructive testing. Mentioned composites are used, among other applications, in wind turbine blades and are exposed to various kinds of damages. The equipment reliability requirements force the development of accurate methods of their health monitoring. In this paper we present the study of composite samples with impact damages, using three methods: terahertz time domain inspection, active thermography with convective excitation, and active thermography with microwave excitation. The results of discrete Fourier transform of obtained time sequences of signals will be presented as well as some image processing of resulting amplitude and phase images. Proposed experimental methods combined with harmonic analysis are efficient tool of defects detection and allowed to detect flaws in examined specimens. Reader may find it interesting that in spite of differences in nature of applied experimental methods, one technique of signal processing (harmonic analysis) gave adequate and comparable results in each case.

In-situ monitoring of woven glass fiber reinforced composites under flexural loading through embedded aligned carbon nanotube sheets

2018 ◽  
Vol 52 (20) ◽  
pp. 2777-2788 ◽  
Author(s):  
Karim Aly ◽  
Ang Li ◽  
Philip D Bradford
Keyword(s):  
Carbon Nanotube ◽  
Electrical Resistance ◽  
Electromechanical Coupling ◽  
In Situ Monitoring ◽  
Fiber Reinforced Composites ◽  
Shear Stresses ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Resistance Change ◽  
Flexural Loading

In practical situations, the flexural loading of fiber reinforced composites is one of the most common types of loading for structures. Nonetheless, carbon nanotubes, which have been used extensively to study in-plane strain sensing in composites, have rarely been employed to monitor flexural induced strains. With this motivation, this paper introduces a novel method for localizing aligned carbon nanotube sheet layers in three selected locations inside a laminated composite structure. These top, middle, and bottom locations are more prone to damage since they experience maximum flexural induced tension, compression, and interlaminar shear stresses. The composite structural performance is monitored by establishing an electromechanical coupling between the developing strain and the three carbon nanotube sensing elements’ in-plane electrical resistance changes that are measured simultaneously. The results of the monotonic and dynamic flexural loading tests suggest that carbon nanotube sensing materials exhibit a high level of sensitivity. The results also show that the resistance change of the three embedded carbon nanotube layers appeared to track the mechanical state of the host structure well. The carbon nanotube layer embedded in the middle section showed a piezoresistive behavior in response to the growing complex stress state with a few electrical resistance change spikes corresponding to damage developing inside the laminated structure. This flexural sensing behavior may considered as useful for real applications because in addition to sensing strain, this technology may help in predicting the failure of the composite component before the actual end of service life.

scholarly journals Electrically Conductive MXene-Coated Glass Fibers for Damage Monitoring in Fiber-Reinforced Composites

2020 ◽  
Vol 6 (4) ◽  
pp. 64
Author(s):  
Christine B. Hatter ◽  
Asia Sarycheva ◽  
Ariana Levitt ◽  
Babak Anasori ◽  
Latha Nataraj ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Electrical Resistance ◽  
Structural Changes ◽  
Glass Fibers ◽  
Fiber Reinforced Composites ◽  
Fiber Bundles ◽  
Oxygen Plasma Treatment ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Coated Glass

Multifunctional fiber-reinforced composites play a significant role in advanced aerospace and military applications due to their high strength and toughness resulting in superior damage tolerance. However, early detection of structural changes prior to visible damage is critical for extending the lifetime of the part. MXenes, an emerging class of two-dimensional (2D) nanomaterials, possess hydrophilic surfaces, high electrical conductivity and mechanical properties that can potentially be used to identify damage within fiber-reinforced composites. In this work, conductive Ti3C2Tx MXene flakes were successfully transferred onto insulating glass fibers via oxygen plasma treatment improving adhesion. Increasing plasma treatment power, time and coating layers lead to a decrease in electrical resistance of MXene-coated fibers. Optimized uniformity was achieved using an alternating coating approach with smaller flakes helping initiate and facilitate adhesion of larger flakes. Tensile testing with in-situ electrical resistance tracking showed resistances as low as 1.8 kΩ for small-large flake-coated fiber bundles before the break. Increased resistance was observed during testing, but due to good adhesion between the fiber and MXene, most connective pathways within fiber bundles remained intact until fiber bundles were completely separated. These results demonstrate a potential use of MXene-coated glass fibers in damage-sensing polymer-matrix composites.

scholarly journals Tridimensional characterization of epoxy matrix glass-fiber reinforced composites

2018 ◽  
Author(s):  
Lorenleyn de L. H. Alford ◽  
Sidnei Paciornik ◽  
José R. M. d’Almeida ◽  
Marcos H. de P. Mauricio ◽  
Haimon D.L. Alves
Keyword(s):  
Glass Fiber ◽  
Epoxy Matrix ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Matrix Glass ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced
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