scholarly journals Damage Investigation of Carbon-Fiber-Reinforced Plastic Laminates with Fasteners Subjected to Lightning Current Components C and D

2020 ◽  
Vol 10 (6) ◽  
pp. 2147
Author(s):  
Jian Chen ◽  
Xiaolei Bi ◽  
Juan Liu ◽  
Zhengcai Fu
Keyword(s):  
Carbon Fiber ◽  
Current Amplitude ◽  
Carbon Fiber Reinforced Plastic ◽  
Conduction Current ◽  
Cfrp Laminate ◽  
Cfrp Laminates ◽  
Fiber Reinforced Plastic ◽  
Lightning Current ◽  
Reinforced Plastic ◽  
Component C

The damage induced by lightning strikes in carbon-fiber-reinforced plastic (CFRP) laminates with fasteners is a complex multiphysics coupling process. To clarify the effects of different lightning current components on the induced damage, components C and D were used in simulated lightning strike tests. Ultrasonic C-scans and stereomicroscopy were used to evaluate the damage in the tested specimens. In addition, the electrothermal coupling theory was adopted to model the different effects of the arc and the current flowing through the laminate (hereinafter referred to as the conduction current) on CFRP laminates with fasteners under different lightning current components. Component C, which has a low current amplitude and a long duration, ablated and gasified the fastener and caused less damage to the CFRP laminate. Under component C, the heat produced by the arc played a leading role in damage generation. Component D, which has a high current amplitude and a short duration, caused serious surface and internal damage in the CFRP laminate and little damage to the fastener. Under component D, the damage was mainly caused by the Joule heat generated by the conduction current.

Effects of Fiber Orientation Direction on Tool-Wear Processes in Down-Milling of Carbon Fiber-Reinforced Plastic Laminates

2015 ◽  
Vol 9 (4) ◽  
pp. 356-364 ◽  
Author(s):  
Satoru Maegawa ◽  
◽  
Yuta Morikawa ◽  
Shinya Hayakawa ◽  
Fumihiro Itoigawa ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Tool Wear ◽  
Fiber Orientation ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced ◽  
Cfrp Laminates ◽  
Fiber Reinforced Plastic ◽  
Orientation Direction ◽  
Reinforced Plastic ◽  
Carbon Fiber Reinforced

This paper discusses tool-wear processes in the milling of carbon fiber-reinforced plastic (CFRP) laminates. Plane down-milling tests with unidirectional and cross-directional CFRP laminates were performed using two types of cutting tools made of tungsten carbide and polycrystalline diamond. Measurements of the changes in the cutting forces and tool-wear widths over the cutting distance revealed that the fiber orientation direction in the CFRP laminates relative to the tool-traveling direction is an important parameter to determine the tool-wear processes. Additionally, based on obtained experimental results, a wear parameter to characterize cutting tool wear is introduced. This parameter can accurately explain the relationship between the worn tool-edge profiles and the processed-surface quality.

ELECTRICAL ACTIVATION OF THERMO-RESPONSIVE PVC-CFRP LAMINATE ACTUATORS

2011 ◽  
Vol 04 (03) ◽  
pp. 305-308 ◽  
Author(s):  
HIROHISA TAMAGAWA ◽  
WENYI LIN ◽  
MINORU SASAKI
Keyword(s):  
Thermal Expansion ◽  
Carbon Fiber ◽  
Joule Heat ◽  
Electroactive Polymer ◽  
Electrical Activation ◽  
Carbon Fiber Reinforced Plastic ◽  
Cfrp Laminate ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Polymer Actuator

A bimorph actuator of PVC-CFRP laminate (PVC: polyvinylchloride; CFRP: carbon fiber reinforced plastic) is fabricated, where its bending results from the large disparity between the coefficients of thermal expansion of PVC and CFRP. Thermal expansion is brought about by applying a voltage to the CFRP layer of the PVC-CFRP laminate to generate Joule heat. Thus, the PVC-CFRP laminate acts as an electroactive polymer actuator. The authors experimentally confirmed that laminate temperature due to Joule heat completely determines laminate deflection curvature, and also demonstrated that temperature determines the blocking force generated by PVC-CFRP laminate.

scholarly journals Stressing State Analysis of Reinforced Concrete Beam Strengthened by CFRP Sheet with Anchoring Device

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 576
Author(s):  
Liang Luo ◽  
Jie Lai ◽  
Jun Shi ◽  
Guorui Sun ◽  
Jie Huang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Strain Distribution ◽  
Carbon Fiber Reinforced Plastic ◽  
Rc Beams ◽  
Fiber Reinforced ◽  
Strain Distribution Pattern ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Cfrp Sheet ◽  
Carbon Fiber Reinforced

This paper investigates the working performance of reinforcement concrete (RC) beams strengthened by Carbon-Fiber-Reinforced Plastic (CFRP) with different anchoring under bending moment, based on the structural stressing state theory. The measured strain values of concrete and Carbon-Fiber-Reinforced Plastic (CFRP) sheet are modeled as generalized strain energy density (GSED), to characterize the RC beams’ stressing state. Then the Mann–Kendall (M–K) criterion is applied to distinguish the characteristic loads of structural stressing state from the curve, updating the definition of structural failure load. In addition, for tested specimens with middle anchorage and end anchorage, the torsion applied on the anchoring device and the deformation width of anchoring device are respectively set parameters to analyze their effects on the reinforcement performance of CFRP sheet through comparing the strain distribution pattern of CFRP. Finally, in order to further explore the strain distribution of the cross-section and analyze the stressing-state characteristics of the RC beam, the numerical shape function (NSF) method is proposed to reasonably expand the limited strain data. The research results provide a new angle of view to conduct structural analysis and a reference to the improvement of reinforcement effect of CFRP.

scholarly journals Comparison of Mode Shapes of Carbon-Fiber-Reinforced Plastic Material Considering Carbon Fiber Direction

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 311
Author(s):  
Chan-Jung Kim
Keyword(s):  
Carbon Fiber ◽  
Modal Analysis ◽  
Dynamic Behavior ◽  
Mode Shapes ◽  
Modal Parameters ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Direction ◽  
Fiber Reinforced ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic

Previous studies have demonstrated the sensitivity of the dynamic behavior of carbon-fiber-reinforced plastic (CFRP) material over the carbon fiber direction by performing uniaxial excitation tests on a simple specimen. However, the variations in modal parameters (damping coefficient and resonance frequency) over the direction of carbon fiber have been partially explained in previous studies because all modal parameters have only been calculated using the representative summed frequency response function without modal analysis. In this study, the dynamic behavior of CFRP specimens was identified from experimental modal analysis and compared five CFRP specimens (carbon fiber direction: 0°, 30°, 45°, 60°, and 90°) and an isotropic SCS13A specimen using the modal assurance criterion. The first four modes were derived from the SCS13A specimen; they were used as reference modes after verifying with the analysis results from a finite element model. Most of the four mode shapes were found in all CFRP specimens, and the similarity increased when the carbon fiber direction was more than 45°. The anisotropic nature was dominant in three cases of carbon fiber, from 0° to 45°, and the most sensitive case was found in Specimen #3.

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