scholarly journals Interface mechanical damage mechanism in machining carbon fiber-reinforced plastic/Ti stacks based on a three-dimensional microscopic oblique cutting model

2022 ◽  
Vol 279 ◽  
pp. 114737
Author(s):  
Changping Li ◽  
Yongfeng Zhao ◽  
Xinyi Qiu ◽  
Shujian Li ◽  
Qiulin Niu ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Three Dimensional ◽  
Mechanical Damage ◽  
Damage Mechanism ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced ◽  
Oblique Cutting ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Cutting Model

Surface damage reduction of dry milling carbon fiber reinforced plastic/polymer using left–right edge milling tool

2020 ◽  
Vol 39 (11-12) ◽  
pp. 409-421 ◽  
Author(s):  
Fu-Ji Wang ◽  
Jian-Bo Yan ◽  
Meng Zhao ◽  
Dong Wang ◽  
Xiao-Nan Wang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Thrust Force ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced ◽  
Concentrated Force ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Milling Tool ◽  
Carbon Fiber Reinforced ◽  
Cutting Model

Carbon fiber reinforced plastic/polymer is popular for aerospace structures and these structures require milling with desired configuration and integrity within strict damage tolerance. However, due to the influence of cutting thrust force on the surface materials when milling carbon fiber reinforced plastic/polymer, it is easy to cause surface damages. This article aimed to study the effect of cutting thrust force direction and size on the damages and guided the suitable milling tool and cutting parameters, further to propose a milling method with low damages. The two-dimensional cutting model was established successfully for analyzing the tool–composite contact and the fiber–plastic/polymer interface crack. Based on the model, the cutting direction forward inside and small cutting force are the ways to avoiding the burrs and tears. The thrust force was the main concentrated force causing the damages in milling, so the left–right edge milling tool was proposed to realize cutting fibers to inside for both surfaces. Besides, small feed per tooth is an effective way to reduce the force. Therefore, the left–right edge milling tool with small feed per tooth is low-damages method. Comparative milling experiments are carried out to verify the method, from the result, the burrs, tears and delamination are effectively inhibited.

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.

Study on the mechanism of inhomogeneous microdamage in short-pulse laser processing of carbon fiber reinforced plastic

2021 ◽  
pp. 073168442098359
Author(s):  
Luyao Xu ◽  
Jiuru Lu ◽  
Kangmei Li ◽  
Jun Hu
Keyword(s):  
Carbon Fiber ◽  
Pulse Energy ◽  
Short Pulse ◽  
Heterogeneous Material ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced ◽  
Processing Efficiency ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Carbon Fiber Reinforced

In this article, a micro-heterogeneous material simulation model with carbon fiber and resin phase about laser ablation on carbon fiber reinforced plastic (CFRP) is established by Ansys. The ablation process of CFRP by nanosecond ultraviolet laser is simulated, and the mechanism of pulse energy and spot spacing on the heat-affected zone (HAZ) is studied, then the process parameters are optimized with the goal of HAZ size and processing efficiency, and finally the validity of the model is verified by experiments. It is found that the residual gradient and the width of the radial HAZ increase with the increase of the spot spacing, and the width of the axial HAZ decreases slightly with the increase of the spot spacing, which indicates the existence of the optimal spot spacing. Second, the ablation depth increases with the increase of the pulse energy, and the carbon fiber retains a relatively complete degree of exposure when the pulse energy is low, which has a certain guiding significance for the cleaning and bonding of CFRP.

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