Nondestructive testing of carbon-fiber-reinforced laminates by monitoring of electrical resistance

2001 ◽  
Author(s):  
Torsten Prasse ◽  
F. Michel ◽  
Gerhard Mook ◽  
Karl Schulte ◽  
Wolfang Bauhofer
Keyword(s):  
Carbon Fiber ◽  
Nondestructive Testing ◽  
Electrical Resistance ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced ◽  
Fiber Reinforced Laminates

Acousto-Ultrasonic Technology for Nondestructive Evaluation of Concrete Bridge Members Strengthened by Carbon Fiber–Reinforced Polymer

2005 ◽  
Vol 1928 (1) ◽  
pp. 245-251 ◽  
Author(s):  
Mahmut Ekenel ◽  
Nestore Galati ◽  
John J. Myers ◽  
Antonio Nanni ◽  
Valery Godínez
Keyword(s):  
Carbon Fiber ◽  
Nondestructive Testing ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Ultrasonic Nondestructive Testing ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Wide Range ◽  
Cfrp Sheet ◽  
Carbon Fiber Reinforced

Carbon fiber–reinforced polymer (CFRP) composites have been used in a wide range of application areas in bridge rehabilitations because these materials are less affected by corrosive environmental conditions, are known to provide longer life, and require less maintenance. However, the quality control and quality assessment of these new rehabilitation systems should be further improved and standardized. A recent rehabilitation project that used CFRP laminates was done on a bridge in Dallas County, Missouri, by the Missouri Department of Transportation and the Center for Infrastructure Engineering Studies at the University of Missouri–Rolla. The acousto-ultrasonic nondestructive testing technology was performed to detect and image surface defects in the form of delaminations. These were intentionally formed at the CFRP sheet–concrete interface to investigate the ability of this technique. Acousto-ultrasonic nondestructive testing has shown the ability to detect and image the delaminations between CFRP sheet and concrete substrate.

Damage detection in carbon fiber–reinforced polymer composite via electrical resistance tomography with Gaussian anisotropic regularization

2018 ◽  
Vol 18 (5-6) ◽  
pp. 1698-1710 ◽  
Author(s):  
Jan Cagáň ◽  
Jaroslav Pelant ◽  
Martin Kyncl ◽  
Martin Kadlec ◽  
Lenka Michalcová
Keyword(s):  
Electrical Conductivity ◽  
Carbon Fiber ◽  
Polymer Composites ◽  
Electrical Resistance ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Carbon Fiber Reinforced

Electrical resistance tomography is a method for sensing the spatial distribution of electrical conductivity. Therefore, this type of tomography is suitable for sensing damages, which affect electrical conductivity. The utilization of resistance tomography for the structural health monitoring of carbon fiber–reinforced polymer composites is questionable owing to its low spatial resolution and the strong anisotropy of carbon fiber–reinforced polymer composites. This article deals with the employment of resistance tomography with regularization based on a Gaussian anisotropic smoothing filter for the detection of cuts. The advantages of the filter are shown through the image reconstruction of rectangular composite specimens with three different laminate stacking sequences. The cuts are implemented by a milled groove. Visual comparison of the images shows a substantial improvement in the shape reconstruction ability. In addition to visual comparison, the image reconstructions are assessed in terms of the reconstruction error and cross-correlation.

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