scholarly journals A Multiscale Modelling Approach for Estimating the Effect of Defects in Unidirectional Carbon Fiber Reinforced Polymer Composites

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1885 ◽  
Author(s):  
Kim-Niklas Antin ◽  
Anssi Laukkanen ◽  
Tom Andersson ◽  
Danny Smyl ◽  
Pedro Vilaça
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Fiber Composite ◽  
Micromechanical Model ◽  
Element Model ◽  
Multiscale Modelling ◽  
Carbon Fiber Composites ◽  
Carbon Fiber Composite ◽  
Microscale Model ◽  
Modelling Approach

A multiscale modelling approach was developed in order to estimate the effect of defects on the strength of unidirectional carbon fiber composites. The work encompasses a micromechanics approach, where the known reinforcement and matrix properties are experimentally verified and a 3D finite element model is meshed directly from micrographs. Boundary conditions for loading the micromechanical model are derived from macroscale finite element simulations of the component in question. Using a microscale model based on the actual microstructure, material parameters and load case allows realistic estimation of the effect of a defect. The modelling approach was tested with a unidirectional carbon fiber composite beam, from which the micromechanical model was created and experimentally validated. The effect of porosity was simulated using a resin-rich area in the microstructure and the results were compared to experimental work on samples containing pores.

scholarly journals A Multiscale Modelling Approach for Estimating the Effect of Defects in Unidirectional Carbon Fiber Reinforced Polymer Composites

2019 ◽  
Author(s):  
Kim-Niklas Antin ◽  
Anssi Laukkanen ◽  
Tom Andersson ◽  
Danny Smyl ◽  
Pedro Vilaça
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Fiber Composite ◽  
Micromechanical Model ◽  
Element Model ◽  
Multiscale Modelling ◽  
Carbon Fiber Composites ◽  
Carbon Fiber Composite ◽  
Microscale Model ◽  
Modelling Approach

A multiscale modelling approach was developed in order to estimate the effect of defects on the strength of unidirectional carbon fiber composites. The work encompasses a micromechanics approach, where the known reinforcement and matrix properties are experimentally verified and a 3D finite element model is meshed directly from micrographs. Boundary conditions for loading the micromechanical model are derived from macroscale finite element simulations of the component in question. Using a microscale model based on the actual microstructure, material parameters and load case allows realistic estimation of the effect of a defect. The modelling approach was tested with a unidirectional carbon fiber composite beam, from which the micromechanical model was created and experimentally validated. The effect of porosity was simulated using a resin-rich area in the microstructure and the results were compared to experimental work on samples containing pores.

scholarly journals Lightweight Cellulose/Carbon Fiber Composite Foam for Electromagnetic Interference (EMI) Shielding

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1319 ◽  
Author(s):  
Ran Li ◽  
Huiping Lin ◽  
Piao Lan ◽  
Jie Gao ◽  
Yan Huang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Electromagnetic Interference ◽  
Fiber Composite ◽  
Carbon Fiber Composites ◽  
Shielding Effectiveness ◽  
Electromagnetic Interference Shielding ◽  
Carbon Fiber Composite ◽  
Foaming Process ◽  
Long Carbon Fibers

Lightweight electromagnetic interference shielding cellulose foam/carbon fiber composites were prepared by blending cellulose foam solution with carbon fibers and then freeze drying. Two kinds of carbon fiber (diameter of 7 μm) with different lengths were used, short carbon fibers (SCF, L/D = 100) and long carbon fibers (LCF, L/D = 300). It was observed that SCFs and LCFs built efficient network structures during the foaming process. Furthermore, the foaming process significantly increased the specific electromagnetic interference shielding effectiveness from 10 to 60 dB. In addition, cellulose/carbon fiber composite foams possessed good mechanical properties and low thermal conductivity of 0.021–0.046 W/(m·K).

Research on the Nonlinear Ultrasonic Testing of CFRP Based on Abaqus

2014 ◽  
Vol 610 ◽  
pp. 205-208
Author(s):  
Sang Sang Yu ◽  
Hui Feng Zheng ◽  
Wang Cheng ◽  
Ting Hao Tang
Keyword(s):  
Carbon Fiber ◽  
Ultrasonic Testing ◽  
Fiber Composite ◽  
High Sensitivity ◽  
Finite Amplitude ◽  
Carbon Fiber Composites ◽  
Carbon Fiber Composite ◽  
Detection Mechanism ◽  
Detection Model ◽  
Element Simulation

In order to overcome the limitations of conventional ultrasonic testing method to detect small defects of carbon fiber composite material, ultrasonic nonlinear detection method was proposed based on finite amplitude. Firstly the detection mechanism of finite amplitude method was studied, then the detection model was created, and ultrasonic nonlinear characteristics of carbon fiber composites was analyzed by finite element simulation, finally relative non-linear coefficients follow the change of defect length and width show that the finite amplitude method has a high sensitivity to detect small defects.

Damage Mechanism Analysis of Carbon Fiber Composites under Compressive Load

2018 ◽  
Vol 775 ◽  
pp. 36-42 ◽  
Author(s):  
Xun Lai He ◽  
Jun Hui Yin ◽  
Zhen Qian Yang ◽  
Hong Wei Liu
Keyword(s):  
Carbon Fiber ◽  
Failure Mode ◽  
Fiber Composite ◽  
Testing Machine ◽  
Compressive Load ◽  
Damage Mechanism ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
Carbon Fiber Composite ◽  
Static Compression

Carbon fiber composite material with light weight, high strength, corrosion resistance and other characteristics of its impact damage mechanism is different from the traditional metal materials. In this paper, the quasi-static compression of carbon fiber composites was carried out by using a material testing machine to analyze the damage mechanism. The Hopkinson bar technology was used to test the dynamic mechanical properties. The damage mechanism of the carbon fiber composites under dynamic compressive loading was studied. Stress - Strain relationship of composites under Quasi - static and dynamic compressive load. It is found that the main failure mode of out-of-plane direction of carbon fiber composite laminates is brittle shear failure, while the in-plane failure mode shows the properties of brittle materials.

scholarly journals Detection of Pin Failure in Carbon Fiber Composites Using the Electro-Mechanical Impedance Method

Sensors ◽  
2020 ◽  
Vol 20 (13) ◽  
pp. 3732
Author(s):  
Jochen Moll ◽  
Matthias Schmidt ◽  
Johannes Käsgen ◽  
Jörg Mehldau ◽  
Marcel Bücker ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Damage Detection ◽  
Fiber Composite ◽  
Mechanical Impedance ◽  
Impedance Method ◽  
Carbon Fiber Composites ◽  
Carbon Fiber Composite ◽  
Bending Loads ◽  
Metallic Parts ◽  
Hybrid Carbon

This paper presents a proof of concept for simultaneous load and structural health monitoring of a hybrid carbon fiber rudder stock sample consisting of carbon fiber composite and metallic parts in order to demonstrate smart sensors in the context of maritime systems. Therefore, a strain gauge is used to assess bending loads during quasi-static laboratory testing. In addition, six piezoelectric transducers are placed around the circumference of the tubular structure for damage detection based on the electro-mechanical impedance (EMI) method. A damage indicator has been defined that exploits the real and imaginary parts of the admittance for the detection of pin failure in the rudder stock. In particular, higher frequencies in the EMI spectrum contain valuable information about damage. Finally, the information about damage and load are merged in a cluster analysis enabling damage detection under load.

Layup Analyzing of a Carbon/Glass Hybrid Composite Wind Turbine Blade Using Finite Element Analysis

2011 ◽  
Vol 87 ◽  
pp. 49-54 ◽  
Author(s):  
Hai Chen Lin
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Wind Turbine ◽  
Glass Fiber ◽  
Turbine Blade ◽  
Carbon Fibers ◽  
Fiber Composite ◽  
Wind Turbine Blade ◽  
Fiber Reinforced ◽  
Carbon Fiber Composite

This thesis use AOC15/50 blade as baseline model which is a composite wind turbine blade made of glass/epoxy for a horizontal axis wind turbine. A finite element modeling of composite wind turbine blade was created using the SHELL element of ANSYS. Then we study how to use the carbon fiber material replaces the glass fiber to make the hybrid blade, and find a suitable layup to improve the performance of the blade. The hybrid blade was made through introducing carbon fibers. Different models, with introducing different number of carbon fibers, 75% carbon fibers replace unidirectional glass fibers in spar cap of blade model which can achieve best structure performance. The wind turbine blades are often fabricated by hand using multiple of glass fiber-reinforced polyester resin or glass fiber-reinforced epoxy resin. As commercial machines get bigger, this could not to meet the demands. The advantages of carbon fiber composite materials are used by blade producer. Studies show that carbon fiber has high strength-to-weight ratio and resistance fatigue properties. Carbon fiber is mixed with epoxy resin to make into carbon fiber-reinforced polymer. Carbon fiber-reinforced polymer is the one of best blade materials for resistance bad weather. The stiffness of carbon fiber composite is 2 or 3 times higher than glass fiber composite [1], but the cost of carbon fiber composite is 10 times higher than glass fiber composite. If all of wind turbine blades are made of carbon fiber composite, it will be very expensive. Therefore carbon/glass fiber hybrid composite blade has become a research emphasis in the field of blade materials. This paper gives an example of finite element modeling composite wind turbine blade in ANSYS by means of the medium-length blade of AOC 15/50 horizontal axis wind turbine. This model can be directly used in dynamics analysis and does not need to be imported from the CAD software into finite element program. This finite element modeling of composite wind turbine blade was created using the SHELL element of ANSYS. Then we study how to use the carbon fiber material replaces the glass fiber to make the hybrid blade, and find a suitable lay-up to improve the performance of the blade.

Facile in situ preparation of high-performance epoxy vitrimer from renewable resources and its application in nondestructive recyclable carbon fiber composite

2019 ◽  
Vol 21 (6) ◽  
pp. 1484-1497 ◽  
Author(s):  
Sheng Wang ◽  
Songqi Ma ◽  
Qiong Li ◽  
Xiwei Xu ◽  
Binbo Wang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Renewable Resources ◽  
High Performance ◽  
Fiber Composite ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
Carbon Fiber Composite ◽  
In Situ Preparation

A high-performance epoxy vitrimer was facilely prepared from a renewable lignin derivative vanillin, and its carbon-fiber composites were nondestructively recycled.

scholarly journals Synergetic Effects of Mechanical Properties on Graphene Nanoplatelet and Multiwalled Carbon Nanotube Hybrids Reinforced Epoxy/Carbon Fiber Composites

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Pin-Ning Wang ◽  
Tsung-Han Hsieh ◽  
Chin-Lung Chiang ◽  
Ming-Yuan Shen
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Carbon Fiber ◽  
Composite Laminates ◽  
Epoxy Composite ◽  
Fiber Composite ◽  
Synergetic Effect ◽  
Carbon Fiber Composites ◽  
Carbon Fiber Composite ◽  
Multiwalled Carbon

Graphene nanoplatelets (GNPs) and carbon nanotubes (CNTs) are novel nanofillers possessing attractive characteristics, including robust compatibility with most polymers, high absolute strength, and cost effectiveness. In this study, an outstanding synergetic effect on the grapheme nanoplatelets (GNPs) and multiwalled carbon nanotubes (CNTs) hybrids were used to reinforce epoxy composite and epoxy/carbon fiber composite laminates to enhance their mechanical properties. The mechanical properties of CNTs/GNPs hybrids on a fixed weight fraction (1 wt%) with mixing different ratio reinforced epoxy nanocomposite, such as ultimate tensile strength and flexure properties, were investigated. The mechanical properties of epoxy/carbon fiber composite laminates containing different proportions of CNTs/GNPs hybrids (0.5, 1.0, 1.5 wt%) were increased over that of neat laminates. Consequently, significant improvement in the mechanical properties was attained for these epoxy resin composites and carbon fiber-reinforced epoxy composite laminates.

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