scholarly journals Development of Novel Thin-Ply Technology for Carbon Fibre Composite Materials

2020 ◽  
Author(s):  
◽  
Rebecca A. Blows
Keyword(s):  
Mechanical Properties ◽  
Phase Separation ◽  
Composite Materials ◽  
Carbon Fibre ◽  
Moisture Absorption ◽  
Fibre Composite ◽  
Image Correlation ◽  
Resin Matrix ◽  
Carbon Fibre Composite ◽  
Carbon Fibre Composites

The increasing popularity of carbon fibre reinforced polymers means that enhancement of material properties is of high commercial value. Thin-ply technology is one area of research focussed on achieving this goal. The aim of this work was to investigate the use of thin-ply technology by studying the effect of ply thickness on the physical and mechanical properties of carbon fibre composite materials, after exposure to various environmental conditions. A review of mechanical properties at ambient conditions and after exposure to both high temperature and moisture was conducted. Quasi-isotropic thin-ply carbon fibre composites were found to have enhanced mechanical properties, compared to thicker ply materials comprising the same resin and matrix, under various loading conditions. One of the main mechanisms for this is thought to be the lower interfacial stresses seen with thin-ply materials, as demonstrated through the use of high-speed camera video recording and digital image correlation. An investigation into the effect of ply thickness on moisture absorption and diffusion rate was also conducted. For the material under investigation, diffusion rates remained constant with changes to ply thickness, whereas moisture absorption was greater for the thinner ply material. In addition, the effect of ply thickness on viscoelastic properties was also studied. The use of dynamic mechanical analysis suggested that the material under investigation tended to a two-phase state. This is thought to be the result of phase-separation of the epoxy resin matrix and poly-ether-sulfone (PES) toughening particles. Ply thickness was shown to have some effect on the phase separation of epoxy and PES.

Hybrid silica micro and PDDA/nanoparticles-reinforced carbon fibre composites

2016 ◽  
Vol 51 (6) ◽  
pp. 783-795 ◽  
Author(s):  
Júlio C Santos ◽  
Luciano MG Vieira ◽  
Túlio H Panzera ◽  
André L Christoforo ◽  
Marco A Schiavon ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibre ◽  
Silica Nanoparticles ◽  
Fibre Composite ◽  
Flexural Modulus ◽  
Specific Chemical ◽  
Diallyldimethylammonium Chloride ◽  
Fibre Composites ◽  
Carbon Fibre Composites ◽  
Hybrid Carbon

The work describes the manufacturing and testing of novel hybrid epoxy/carbon fibre composites with silica micro and poly-diallyldimethylammonium chloride-functionalised nanoparticles. A specific chemical dispersion procedure was applied using the poly-diallyldimethylammonium chloride to avoid clustering of the silica nanoparticles. The influence of the various manufacturing parameters, particles loading, and mechanical properties of the different phases has been investigated with a rigorous Design of Experiment technique based on a full factorial design (2131). Poly-diallyldimethylammonium chloride-functionalised silica nanoparticles were able to provide a homogenous dispersion, with a decrease of the apparent density and enhancement of the mechanical properties in the hybrid carbon fibre composites. Compared to undispersed carbon fibre composite laminates, the use of 2 wt% functionalised nanoparticles permitted to increase the flexural modulus by 47% and the flexural strength by 15%. The hybrid carbon fibre composites showed also an increase of the tensile modulus (9%) and tensile strength (5.6%).

Incremental Damage Development in a 3D Woven Carbon Fibre Composite

2007 ◽  
Vol 15 (7) ◽  
pp. 521-533
Author(s):  
S. King ◽  
G. Stewart ◽  
A.T. McIlhagger ◽  
J.P. Quinn
Keyword(s):  
Carbon Fibre ◽  
Fibre Composite ◽  
Weight Ratio ◽  
Matrix Cracking ◽  
Limiting Factors ◽  
Damage Development ◽  
Carbon Fibre Composite ◽  
Damage Initiation ◽  
Fibre Composites ◽  
Carbon Fibre Composites

Interest in 3D woven carbon fibre composites has increased within industries such as aerospace, automotive and marine, due to their high strength to weight ratio, their increased tailorability and their capacity to be manufactured into near net shape preforms, thereby reducing parts count, assembly time, labour intensity and costs. It is vital that critical areas of concern such as damage (and in particular damage initiation and development) are studied and understood, thereby reducing the limiting factors to their acceptance. The damage initiation and subsequent intervals of development for ILSS (Interlaminar Shear Strength) were determined experimentally. Particular focus is paid to the significance of binder edge and binder middle testing and the influence of through-the-thickness (T-T-T) reinforcement in relation to damage types and development. Control samples for binder edge and binder middle loading locations were tested to failure as a means of determining an average point of failure, allowing the generation of testing intervals. The performance and architecture of samples from each incremental interval were characterised using a combination of graphical analysis and optical microscopy with the aid of dye-penetrant to highlight fibre damage and matrix cracking. Samples displayed specific damage initiation points, thus allowing the generation of a damage guide relating to applied force. In addition, the results imply that a relationship exists between the location of applied load and subsequent damage, thus showing the significant influence played by the T-T-T binder loading location on damage development within 3D woven carbon fibre composites. Some of the preliminary data shown in this paper was presented at IMC23 at the University of Ulster, UK in August 2006 and at Texcomp 8 in Nottingham, UK October 2006.

scholarly journals A Time-Frequency Research for Ultrasonic Guided Wave Generated from the Debonding Based on a Novel Time-Frequency Analysis Technique

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Junhua Wu ◽  
Zheshu Ma ◽  
Yonghui Zhang
Keyword(s):  
Carbon Fibre ◽  
Frequency Analysis ◽  
Instantaneous Frequency ◽  
Fibre Composite ◽  
Guided Wave ◽  
Carbon Fibre Composite ◽  
Time Frequency Analysis ◽  
Time Frequency ◽  
Ultrasonic Guided Wave ◽  
Carbon Fibre Composites

Carbon fibre composites have a promising application in the future of the vehicle, because of their high strength and light weight. Debonding is a major defect of the carbon fibre composite. The time-frequency analysis is fundamental to identify the defect on ultrasonic nondestructive evaluation and testing. In order to obtain the instantaneous frequency and the peak time of modes of the ultrasonic guided wave, an algorithm based on the Smoothed Pseudo Wigner-Ville distribution and the peak-track algorithm is presented. In the algorithm, a masking step is proposed, which can guarantee that the peak-track algorithm can automatically exact the instantaneous frequency and the instantaneous amplitude of different modes on the Smoothed Pseudo Wigner-Ville distribution. An experiment for detecting the debonding for a type of carbon fibre composite is done. The presented algorithm is employed on the experimental signals. The processed result of experimental signals reveals that the defect can stimulate new modes, and there is a quantitative relationship between the defect size and the frequency of the new mode. The presented technique provides a valuable way to detect the presentence, calculate the size, and locate the position of the debonding defect.

scholarly journals Carbon Fibre-Copper Composites Made by Volumetric Bonding.

1993 ◽  
Vol 2 (6) ◽  
pp. 096369359300200 ◽  
Author(s):  
W. Włosinski ◽  
D. Kalinski ◽  
W. Olesinska ◽  
K. Pietrzak
Keyword(s):  
Carbon Fibre ◽  
Fibre Composite ◽  
New Method ◽  
Carbon Fibre Composite ◽  
Fibre Composites ◽  
Composite Microstructure ◽  
Carbon Fibre Composites ◽  
Measured Density

Abstract. The results of investigation on forming copper-carbon fibre composite were presented. A new method of vacuum volumetric bonding was elaborated for this purpose. The copper-carbon fibre composites were processed at temperatures between 750 and 1050°C under pressures of 30 to 60 MPa and times ranging from 15 to 60 minutes. The composite microstructure was found to be homogeneous, the measured density varied from 6.58 up to 7.8 g/cm3 and the hardness ranged from 63 to 113 HB (KG/mm2).

scholarly journals Numerical Analysis of a DMA Epoxy-Carbon Composite Study

2018 ◽  
Vol 9 (4) ◽  
pp. 101-112
Author(s):  
Paweł KOWALECZKO ◽  
Andrzej PANAS ◽  
Mirosław NOWAKOWSKI
Keyword(s):  
Carbon Fibre ◽  
Numerical Simulations ◽  
Composite Structures ◽  
Fibre Composite ◽  
Real Life ◽  
Elastic Response ◽  
Resin Matrix ◽  
Fibre Reinforcement ◽  
Carbon Fibre Composite ◽  
Model Composite

The results of numerical simulations performed for Dynamic Mechanical Analysis (DMA) measurements of thermal and mechanical (or thermomechanical) properties performed on a model composite structure are presented herein. The simulated elastic response of an epoxy-carbon fibre composite specimen was analysed for a case by which the model specimen was subjected to three-point bending with a free support. The epoxy-carbon fibre composite studied as explained herein exhibited extreme differences between the resilient properties of the epoxy resin matrix and the carbon fibre reinforcement. In addition, the carbon fibre reinforcement was both internally and structurally anisotropic. The numerical simulations were performed to demonstrate a qualitative dependence of the DMA measurement results on a certain structure of the investigated specimen and to determine if the DMA results could be qualified as effective or apparent. A macro-mechanical model of the specimen was developed and had the numerical calculations run with COMSOL/M, a FEM modelling software suite. The carbon fibre reinforcement was modelled with an orthotropic structure of laminar or circular inclusions with different characteristic dimensions. Representative material properties were assumed from the results of proprietary experimental investigations and certain reference literature data. The effect of the composite layers’ configuration and their characteristic dimensions on the evaluated model’s elastic modulus value was also studied. The results presented herein suggested a qualitative agreement with the results of the DMA investigations performed on real-life composite structures. They also proved the effectiveness of the developed numerical simulation methodology, shown herein, in the DMA of micro- and macromechanical phenomena

scholarly journals High heat flux erosion of carbon fibre composite materials in the TEXTOR tokamak

1998 ◽  
Vol 258-263 ◽  
pp. 757-763
Author(s):  
H Bolt ◽  
T Scholz ◽  
J Boedo ◽  
K.H Finken ◽  
A Hassanein
Keyword(s):  
Heat Flux ◽  
Composite Materials ◽  
Carbon Fibre ◽  
Fibre Composite ◽  
High Heat ◽  
High Heat Flux ◽  
Carbon Fibre Composite
Sign in / Sign up

Export Citation Format

Share Document