Application of Broadband Laser-Ultrasonic Spectroscopy for Nondestructive Testing of the Porosity in Carbon Fiber Reinforced Plastics with Various Volume Contents of Carbon Fibers

2021 ◽  
Vol 12 (5) ◽  
pp. 1428-1433
Author(s):  
Yu. G. Sokolovskaya ◽  
N. B. Podymova ◽  
A. A. Karabutov
Keyword(s):  
Carbon Fiber ◽  
Nondestructive Testing ◽  
Carbon Fibers ◽  
Fiber Reinforced ◽  
Ultrasonic Spectroscopy ◽  
Laser Ultrasonic ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Broadband Laser ◽  
Fiber Reinforced Plastics

scholarly journals Orthogonal Experimental Analysis and Mechanism Study on Electrochemical Catalytic Treatment of Carbon Fiber-Reinforced Plastics Assisted by Phosphotungstic Acid

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1866
Author(s):  
Chun Pei ◽  
Peiheng Guo ◽  
Ji-Hua Zhu
Keyword(s):  
Carbon Fiber ◽  
Epoxy Resin ◽  
Carbon Fibers ◽  
Phosphotungstic Acid ◽  
Degradation Mechanism ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced

Preserving the integrity of carbon fibers when recycling carbon-fiber-reinforced plastics (CFRPs) has been unfeasible due to the harsh reaction conditions required to remove epoxy resin matrixes, which adversely affect the properties of carbon fibers. We establish a practicable and environmentally friendly reclamation strategy for carbon fibers. Carbon fibers are recycled from waste CFRPs by an electrochemical catalytic reaction with the assistance of phosphotungstic acid (PA), which promotes the depolymerization of diglycidyl ether of bisphenol A/ethylenediamine (DGEBA/EDA) epoxy resin. The removal rate, mechanical strength, and microstructure of the recycled carbon fibers are analyzed to explore the mechanism of the electrochemical treatment. The influence of three factors—current density, PA concentration, and reaction time—are studied via an orthogonal method. Range analysis and variance analysis are conducted to investigate the significance of the factors. The optimal conditions are determined accordingly. The underlying CFRP degradation mechanism is also investigated.

scholarly journals Comparison of Electrical Contacting Techniques to Carbon Fiber Reinforced Plastics for Self-Strain-Sensing Applications

2021 ◽  
Vol 7 (4) ◽  
pp. 81
Author(s):  
Patrick Scholle ◽  
Sören Rüther ◽  
Michael Sinapius
Keyword(s):  
Carbon Fiber ◽  
Contact Resistance ◽  
Carbon Fibers ◽  
Electrical Contact ◽  
Surface Preparation ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced

The electrical conductivity of carbon fibers can be used to enable the design of intrinsically smart carbon fiber reinforced plastics (CFRPs). Resistance and impedance measurements of the structural material itself can then be used to measure physical stimuli such as strain or damage without requiring a dedicated sensor to be installed. Measuring the resistance with high precision requires good electrical contact between the measurement equipment and the conductive carbon fibers. In the literature, many different combinations of surface contacting material and surface preparation procedures are used, but only seldomly compared to one another. This article aims to compare frequently used electrical contact methods by analyzing their contact resistance to a pultruded CFRP rod. Furthermore, this study explores the change of contact resistance with increasing mechanical strain. The results show that contact resistance is highly dependent on both the material used for contacting the fibers as well as the surface preparation technique. From the combinations analyzed in this article, the electrodeposition in combination with a surface treatment using concentrated sulphuric acid shows the most promising results.

Mid-infrared pulsed laser ultrasonic testing for carbon fiber reinforced plastics

Ultrasonics ◽  
2018 ◽  
Vol 84 ◽  
pp. 310-318 ◽  
Author(s):  
Masahiro Kusano ◽  
Hideki Hatano ◽  
Makoto Watanabe ◽  
Shunji Takekawa ◽  
Hisashi Yamawaki ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Ultrasonic Testing ◽  
Pulsed Laser ◽  
Fiber Reinforced ◽  
Laser Ultrasonic ◽  
Mid Infrared ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced

scholarly journals A Review on the Usage of Continuous Carbon Fibers for Piezoresistive Self Strain Sensing Fiber Reinforced Plastics

2021 ◽  
Vol 5 (4) ◽  
pp. 96
Author(s):  
Patrick Scholle ◽  
Michael Sinapius
Keyword(s):  
Carbon Fiber ◽  
Literature Review ◽  
Carbon Fibers ◽  
Fiber Reinforced ◽  
Strain Sensing ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
The Past ◽  
Experimental Approaches ◽  
Fiber Reinforced Plastics

This literature review examines the application of carbon fibers and their reinforced plastics for Self-Strain-Sensing structures and gives an up-to-date overview of the existing research. First, relevant basic experimental approaches that can be found in the literature are presented and discussed. Next, we propose to cluster the available articles into 5 categories based on specimen size and ranging from experiments on bare carbon fiber via impregnated fiber rovings to carbon fiber laminates. Each category is analyzed individually and the potential differences between them are discussed based on experimental evidence found in the past. The overview shows, that the choice of carbon fiber and the specific experimental setup both significantly influence the piezoresistive properties measured in Self-Strain-Sensing carbon fiber reinforced plastics. Conclusively, based on the conclusions drawn from the literature review, we propose a small number of measurements that have proven to be important for the analysis of Self-Strain-Sensing carbon fiber structures.

ULTRASONIC TESTING OF SPESIMENS AT THE DEVELOPMENT AND TESTING PROCESS OF NEW CFRP GRADES

2021 ◽  
pp. 86-95
Author(s):  
A.S. Boychuk ◽  
◽  
I.A. Dikov ◽  
A.S. Generalov ◽  
V.Yu. Chertishchev ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Nondestructive Testing ◽  
Ultrasonic Testing ◽  
Ultrasonic Pulse ◽  
Curved Beam ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Pulse Echo

Nondestructive testing results of carbon fiber reinforced plastics (CFRP) specimens at the development and testing process are given at that paper. Ultrasonic pulse-echo technique is the most applicable for CFRP monolithic panels and curved beam specimens testing. It is shown that ultrasonic testing allows optimizing the mode in the process of developing molding modes for new CFRP grades. At the test stages it allows to exclude defective specimens from the testing process and estimate the sorts and damage sizes after the tests.

Characterization of carbon fibers recovered through mechanochemical-enhanced recycling of waste carbon fiber reinforced plastics

2019 ◽  
Vol 26 (10) ◽  
pp. 2688-2703
Author(s):  
Antony Mutua Nzioka ◽  
Bernard Ouma Alunda ◽  
Cao-zheng Yan ◽  
Ye-Jin Sim ◽  
Myung-Gyun Kim ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced
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