scholarly journals Deformation Behavior and Fracture Patterns of Laminated PEEK- and PI-Based Composites with Various Carbon-Fiber Reinforcement

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2268
Author(s):  
Pavel V Kosmachev ◽  
Vladislav O Alexenko ◽  
Svetlana A Bochkareva ◽  
Sergey V Panin
Keyword(s):  
Carbon Fiber ◽  
Flexural Strength ◽  
Laminated Composites ◽  
Flexural Modulus ◽  
Strength Properties ◽  
Fe Model ◽  
Carbon Fabric ◽  
Model Framework ◽  
Order Of Magnitude ◽  
Stress States

Laminated composites based on polyetheretherketone (PEEK) and polyimide (PI) matrices were fabricated by hot compression. Reinforcing materials (unidirectional carbon-fiber (CF) tapes or carbon fabric) and their layout patterns were varied. Stress–strain diagrams after three-point flexural tests were analyzed, and both lateral faces of the fractured specimens and fractured surfaces (obtained by optical and scanning electron microscopy, respectively) were studied. It was shown that the laminated composites possessed the maximum mechanical properties (flexural elastic modulus and strength) in the case of the unidirectional CF (0°/0°) layout. These composites were also not subjected to catastrophic failure during the tests. The PEEK-based composites showed twice the flexural strength of the PI-based ones (0.4 and 0.2 GPa, respectively), while the flexural modulus was four times higher (60 and 15 GPa, correspondently). The reason was associated with different melt flowability of the used polymer matrices and varied inter- (intra)layer adhesion levels. The effect of adhesion was additionally studied by computer simulation using a developed two-dimensional FE-model. It considered initial defects between the binder and CF, as well as subsequent delamination and failure under loads. Based on the developed FE-model, the influence of defects and delamination on the strength properties of the composites was shown at different stress states, and the corresponding quantitative estimates were reported. Moreover, another model was developed to determine the three-point flexural properties of the composites reinforced with CF and carbon fabric, taking into account different fiber layouts. It was shown within this model framework that the flexural strength of the studied composites could be increased by an order of magnitude by enhancing the adhesion level (considered through the contact area between CF and the binder).

Preparation and Properties of 2D C/SiC Composites by CLVD Processing

2011 ◽  
Vol 675-677 ◽  
pp. 779-782 ◽  
Author(s):  
Si’an Chen ◽  
Hai Feng Hu ◽  
Chang Rui Zhang ◽  
Yu Di Zhang ◽  
Xin Bo He ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Flexural Strength ◽  
Induction Heating ◽  
Vapor Deposition ◽  
Flexural Modulus ◽  
Fiber Bundles ◽  
Xrd Pattern ◽  
Carbon Fiber Cloth ◽  
The Matrix ◽  
Sic Composites

Chemical liquid-vapor deposition (CLVD) process is a new style of fast densification, which combines the advantages of PIP process and CVI process. 2D C/SiC composites were prepared at 800~1200°C for 3~4 hours with liquid polycarbosilane and carbon fiber cloth by CLVD process with induction heating, and had the density of 1.7 g/cm3, the flexural strength of 84.6MPa, and the flexural modulus of 20GPa. XRD pattern of the sample proved that the matrix was β-SiC. It was found that SiC deposited mainly around single fiber instead of among fiber bundles and layers.

scholarly journals Influence of microfillers addition on the flexural properties of carbon fiber reinforced phenolic composites

2021 ◽  
pp. 002199832110316
Author(s):  
IA Abdulganiyu ◽  
INA Oguocha ◽  
AG Odeshi
Keyword(s):  
Carbon Fiber ◽  
Flexural Strength ◽  
Carbon Fibers ◽  
Colloidal Silica ◽  
Flexural Modulus ◽  
Flexural Properties ◽  
Fiber Reinforced ◽  
Cfrp Composites ◽  
Sic Particles ◽  
Flexural Loading

The effects of microfiller addition on the flexural properties of carbon fiber reinforced phenolic (CFRP) matrix composites were investigated. The CFRP was produced using colloidal silica and silicon carbide (SiC) microfillers, 2 D woven carbon fibers, and two variants of phenolic resole (HRJ-15881 and SP-6877). The resins have the same phenol and solid content but differ in their viscosities and HCHO (formaldehyde) content. The weight fractions of microfillers incorporated into the phenolic matrix are 0.5 wt.%, 1 wt.%, 1.5 wt.%, and 2 wt.%. Flexural properties were determined using a three-point bending test and the damage evolution under flexural loading was investigated using optical and scanning electron microscopy. The results indicated that the reinforcement of phenolic resins with carbon fibers increased the flexural strength of the HRJ-15881 and SP-6877 by 508% and 909%, respectively. The flexural strength of the CFRP composites further increased with the addition of SiC particles up to 1 wt.% SiC but decreased with further increase in the amount of SiC particles. On the other hand, the flexural modulus of the CFRP composites generally decreased with the addition of SiC microfiller. Both the flexural strength and flexural modulus of the CFRP did not improve with the addition of colloidal silica particles. The decrease in flexural properties is caused by the agglomeration of the microfillers, with colloidal silica exhibiting more tendency for agglomeration than SiC. The fractured surfaces revealed fiber breakage, matrix cracking, and delamination under flexural loading. The tendency for failure worsened at microfiller addition of ≥1.5 wt.%.

Flexural Properties of T700 2D Cf/SiC Composites via Precursor Infiltration and Pyrolysis

2015 ◽  
Vol 816 ◽  
pp. 152-156
Author(s):  
Xin Ma ◽  
Xin Bo He ◽  
Hai Feng Hu ◽  
Yu Di Zhang ◽  
Yong Li
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Flexural Strength ◽  
Rough Surface ◽  
Load Transfer ◽  
Flexural Modulus ◽  
Flexural Properties ◽  
Internal Defects ◽  
Plain Weave ◽  
Sic Composites

2D Cf/SiC composites were prepared by precursor infiltration and pyrolysis (PIP) process with spreaded T700-12K plain weave carbon clothes as the reinforcement. The mechanical properties and microstructures were investigated. The composites are compact with few internal defects since the precursor could infiltrate the preform effectively. CVD-PyC interface modified the surface of T700 carbon fiber, a rough surface is helpful for the interfacial combination and the load transfer. For the Cf/PyC/SiC composites, the flexural strength and flexural modulus were 425±23.2 MPa and 36.3±3.1 GPa, respectively.

Tailor Made Hybrid Laminates Based on UD-Tapes - A Way to Efficient Thermoplastic Components

2019 ◽  
Vol 809 ◽  
pp. 41-46
Author(s):  
Franz Habla ◽  
M. Kropka ◽  
M. Muehlbacher ◽  
T. Neumeyer ◽  
Volker Altstädt
Keyword(s):  
Carbon Fiber ◽  
Flexural Strength ◽  
Hybrid Material ◽  
Flexural Modulus ◽  
Constant Thickness ◽  
Flexural Properties ◽  
Glass Carbon ◽  
Hybrid Laminates

In this study, the quality of pre-consolidation of a PA6 based glass/carbon hybrid and a glass mono-material UD-tape laminate has been analyzed and the influence of the pre-consolidation step on flexural properties of end-consolidated laminates was determined. For this reason, three different pre-consolidation qualities were mechanically and optically analyzed. The investigations show that the quality of pre-consolidation is not critical for mono-material lay-ups considered in this work. However, the pre-consolidation step has a significant effect on the flexural properties of the hybrid-material laminate presented in this work. The flexural modulus is increased by more than 25 % and the flexural strength up to 9 % due to better welding of the distinct layers. Additionally, the influence of carbon fiber share on the flexural modulus of the UD hybrid-material was examined. It could be recognized that the flexural modulus can be increased up to 171 % by the exchange of glass with carbon fiber layers with a sandwich stacking compared to glass mono-material with constant thickness.

scholarly journals Investigating the effect of pressing temperature on the thermal, mechanical, and morphological properties of nanocomposites made from recycled polyethylene, nanosilica, and wood flour

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 3871-3885
Author(s):  
Amir Lashghari ◽  
Ehsan Ganjavi
Keyword(s):  
Flexural Strength ◽  
Wood Flour ◽  
Flexural Modulus ◽  
Impact Resistance ◽  
Weight Ratio ◽  
Strength Properties ◽  
Morphological Properties ◽  
Sem Images ◽  
Recycled Polyethylene ◽  
The Impact

This study investigated the effect of pressurized temperature on the thermal, mechanical, and morphological properties of nanocomposites made from recycled polyethylene with the weight ratio of 50%. Nanosilica was applied at 3 levels (0, 4, 8 %) and wood flour had a weight ratio of 50%. High-density polyethylene (HDPE) went through multiple procedures. It was found that by increasing the nanosilica content, the tensile and flexural strength properties, the residual ash content, and the thermal stability increased along with a reduction in the tensile and flexural modulus and impact resistance. As the temperature increased, the tensile and flexural strength and modulus and the impact resistance decreased. Scanning electron microscopy (SEM) images revealed that samples with 8% nanosilica showed different polymerization than the wood flour particles.

Flexural Property and In Situ Observation of Carbon Milled Fiber Added Plain Woven Carbon Fiber/Epoxy Resin Composite

2015 ◽  
Vol 665 ◽  
pp. 57-60 ◽  
Author(s):  
Hideaki Katogi ◽  
Kenichi Takemura
Keyword(s):  
Carbon Fiber ◽  
Flexural Strength ◽  
Crack Initiation ◽  
Epoxy Resin ◽  
High Speed ◽  
Resin Composite ◽  
Flexural Modulus ◽  
Flexural Property ◽  
In Situ Observation

In this study, effect of Carbon Milled Fiber (CMF) addition on flexural fracture property of Carbon Fiber Reinforced Plastics (CFRP) was investigated. The CMF additive amounts to the epoxy resin were 0.5wt%, 0.8wt%, 1.0wt% and 1.2wt%. Static three point flexural test was conducted based on Japanese Industrial Standard (JIS) K 7074. The in situ observation of CMF added CFRP was conducted by using high-speed camera. As a result, following conclusions were obtained. In case that CMF additive amount was below 0.8wt%, flexural strength and flexural modulus of CFRP increased with an increase of CMF additive amount. In case of that CMF additive amount was above 1.0wt%, flexural strength and flexural modulus of the CFRP decreased compared with those of CMF 0.8wt% added CFRP. From in situ observation, crack initiation occurred at external layer on tension side of non CMF and CMF added CFRP. After crack initiation, delaminations of non CMF and CMF added CFRP were found. The delamination size of CMF 0.8wt% added CFRP was smaller than that of non CMF and CMF 1.2wt% added CFRP. Therefore, flexural property of CFRP was improved because delamination of CFRP was prevented by CMF 0.8wt%.

Water Absorption and Modification of Kenaf and Flax Fibres

2012 ◽  
Vol 545 ◽  
pp. 342-347 ◽  
Author(s):  
Masitah Abu Kassim ◽  
A. Crosky ◽  
David Ruys
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Water Absorption ◽  
Flexural Modulus ◽  
Strength Properties ◽  
Natural Fibres ◽  
Fibre Types ◽  
Absorption Characteristic ◽  
Flax Fibres ◽  
The Matrix

The experimental work for this project involved several strands; to study the water absorption characteristic of kenaf and flax in composites, to investigate the influence of fibre types on water absorption, and finally to investigate the influence of chemical treatment on water absorption. Hydrophilic character of natural fibres is responsible for the water absorption in the composites. Water absorption of kenaf and flax reinforced polyester composites was occurred via fibres lumen. Mechanical properties are affected by water absorption. After water absorption test, the specimens present poor mechanical properties such as lower value of flexural strength and flexural modulus. The matrix structure was also affected by water absorption by processes such as chain orientation and shrinkage. It was found that the different fibre types had influenced the different percentage of water absorption in composite. It seems that the compatibilization between fibres and matrix has influenced the water absorption of fibres. Acetylation of kenaf and flax fibres has reduced the hygroscopic nature of natural fibres and increased the dimensional stability of composites. The flexural strength properties of acetylated fibres were higher than untreated fibres composites.

Study on the Processibility of BMI for RTM Process and Mechanical Performance of Carbon Fiber Three-Dimension and Five-Direction Braided/BMI Composites

2010 ◽  
Vol 139-141 ◽  
pp. 94-97
Author(s):  
Qi Wei Guo ◽  
Jia Lu Li ◽  
Guo Li Zhang ◽  
Ye Hong He ◽  
Ming Zhang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Mechanical Performance ◽  
Laminated Composites ◽  
Flexural Modulus ◽  
Processing Parameters ◽  
Three Dimension ◽  
Test Results ◽  
Braided Composites ◽  
Rtm Process ◽  
The Impact

The purpose of this study is to investigate the processibility of 6421 bismaleimide (BMI) resin for resin transfer molding (RTM) process and the mechanical performance of 6421 BMI composites reinforced by carbon fiber three-dimension (3D) and five-direction braided preforms. The thermal properties of 6421 BMI resin were investigated using differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). According to these data, the processing parameters and curing rule of BMI for RTM were derived. The flexural test results showed that 3D and five-direction braided composites had higher flexural modulus than that of laminated composites while the flexural strength was lower than that of the laminated composites. The impact strength of 3D and five-direction braided composites is 30.1% more than that of laminated composites. The results of mechanical properties tests indicate that carbon fiber 3D and five-direction braided/BMI composites are suitable for application.

A Carbon Fiber Reinforced Nylon 6 (CFRPA6) Composite Specialized for Military Field Cooking Task

2012 ◽  
Vol 224 ◽  
pp. 199-203
Author(s):  
Xiang Hong Zhang ◽  
Han Yang ◽  
Hao Zhang ◽  
Chun Yang Wang
Keyword(s):  
Mechanical Property ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Carbon Fiber ◽  
Flexural Strength ◽  
Mechanical Alloying ◽  
Carbon Fibers ◽  
Flexural Modulus ◽  
Nylon 6 ◽  
Fiber Reinforced

In this study, nylon PA6 resin was filled with carbon fibers by employing the technique of mechanical alloying and utilizing the special properties of carbon fiber. The effects of carbon fiber on the mechanical property of the nylon PA6 were also studied. From the results, filling nylon PA6 resin with carbon fiber could effectively enhance the tensile strength, the elastic modulus, the flexural strength and the flexural modulus for the material. In addition, the material shrinkage was also significantly reduced. The enhancing effects varied as CF content changed. Through comparative experiments, the optimal proportion of the addition was determined. Replacing the conventional irony back pad of military outdoor pot by this composite would not only largely reduce the load and improve the motility for the soldiers, but also ensure a better battlefield adaptability and comfort.

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