scholarly journals Composite Laminates with Recycled Carbon Fibres and Carbon Nanotubes

2020 ◽  
Vol 57 (1) ◽  
pp. 86-91
Author(s):  
Loredana Santo ◽  
Denise Bellisario ◽  
Leandro Iorio ◽  
Claudia Papa ◽  
Fabrizio Quadrini ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Composite Laminates ◽  
Resin Matrix ◽  
Reinforced Composites ◽  
Carbon Fibres ◽  
Industrial Equipment ◽  
Bending Tests ◽  
Mechanical Measurements ◽  
Unfilled Resin ◽  
Fibre Reinforced Composites

Carbon fibre reinforced composites were manufactured by using recycled carbon fibres (CF) and carbon nanotubes (CNT). Dry fabrics were impregnated by hot melting with 1 wt% CNT filled epoxy resin to produce prepregs. Subsequently, composite laminates were manufactured by vacuum bagging and autoclave moulding. Only materials and industrial equipment were used for the laminate production. Laminates with unfilled resin and virgin CFs were also manufactured for comparison. Samples were extracted for physical and mechanical measurements. Dynamic mechanical analyses and bending tests were carried out to evaluate the interaction between CNTs, resin matrix and recycled CFs.

scholarly journals Modified rule of mixtures and Halpin–Tsai model for prediction of tensile strength of micron-sized reinforced composites and Young’s modulus of multiscale reinforced composites for direct extrusion fabrication

2018 ◽  
Vol 10 (7) ◽  
pp. 168781401878528 ◽  
Author(s):  
Zirong Luo ◽  
Xin Li ◽  
Jianzhong Shang ◽  
Hong Zhu ◽  
Delei Fang
Keyword(s):  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Young’S Modulus ◽  
Carbon Fibers ◽  
Epoxy Resins ◽  
Young's Modulus ◽  
Resin Matrix ◽  
Reinforced Composites ◽  
Rule Of Mixtures ◽  
Combined Use

A modified rule of mixtures is required to account for the experimentally observed nonlinear variation of tensile strength. A modified Halpin–Tsai model was presented to predict the Young’s modulus of multiscale reinforced composites with both micron-sized and nano-sized reinforcements. In the composites, both micron-sized fillers—carbon fibers—and nano-sized fillers—rubber nanoparticles and carbon nanotubes—are added into the epoxy resin matrix. Carbon fibers can help epoxy resins increase both the tensile strength and Young’s modulus, while rubber nanoparticles and carbon nanotubes can improve the toughness without sacrificing other properties. Mechanical experiments and scanning electron microscopy observations were used to study the effects of the micron-sized and nano-sized reinforcements and their combination on tensile and toughness properties of the composites. The results showed that the combined use of multiscale reinforcements had synergetic effects on both the strength and the toughness of the composites.

A simple portable low-pressure healant-injection device for repairing damaged composite laminates

2017 ◽  
Vol 45 (4) ◽  
pp. 360-375 ◽  
Author(s):  
WL Lai ◽  
AYH Cheah ◽  
RCO Ruiz ◽  
NGW Lo ◽  
KQJ Kuah ◽  
...  
Keyword(s):  
Carbon Fibre ◽  
Composite Laminates ◽  
Low Pressure ◽  
Reinforced Composites ◽  
Injection Device ◽  
Destructive Testing ◽  
Micro Cracks ◽  
Flow Through ◽  
Injection Unit ◽  
Fibre Reinforced Composites

This article presents the outcomes of an undergraduate design-for-industry team-driven project to develop a portable low-pressure healant-injection device. The developed healant-injection device is intended to use for teaching purpose. The students practice some of the techniques of repairing damaged composite laminates, as part of an engineering composite-related course, which mainly covers the fundamentals and applications of composite laminates. The healant-injection device works by introducing resin into damaged site that can assist the healant to flow through the network of micro-cracks in a low-pressure environment. The device comprises three components: a chamber featuring a (rectangular box) cover made from acrylic that is intended to cover a damaged surface in a low-pressure environment, an injection unit and a vacuum pump unit. Only the vacuum chamber was designed from scratch by the team; the other components were sourced commercially. The repair of composite laminates can be performed using a low viscosity resin, which is made to flow through a hole on the roof of the chamber, assisted by the injection unit (fluid dispenser), from which the resin flows into the damaged (micro-cracks) site; the very low pressure environment (25–29 inHg) in the chamber facilitates the removal of air pockets in the cracks. The composite laminates featured in this project are carbon fibre reinforced composite laminates, which are of great interest to the aerospace industry. Testing and evaluation were carried out by the team to assess the performance of the healant-injection device using impacted carbon fibre reinforced composites. To assist the team to study the effectiveness of the repair, (a) an ultrasonic C-scan equipment for non-destructive testing was used to assess the extent of the healant flow into the crack regions within the damaged carbon fibre reinforced composites and (b) a compression after impact test was carried out to assess the recovery of the compressive strength of the repaired carbon fibre reinforced composites compare to the pristine and damaged samples in different number of carbon-fibre plies (10, 16, 24 and 32).

Recent Developments in Modelling of Progressive Damage in Fibre-Reinforced Composites

2015 ◽  
Vol 784 ◽  
pp. 274-283
Author(s):  
Bo Yang Chen ◽  
Tong Earn Tay
Keyword(s):  
Composite Laminates ◽  
Progressive Damage ◽  
Reinforced Composites ◽  
Matrix Cracks ◽  
Reinforced Composite ◽  
Recent Developments ◽  
Open Hole ◽  
Tension And Compression ◽  
And Migration ◽  
Fibre Reinforced Composites

This paper provides an overview of recent developments in the modeling of progressive damage in fiber-reinforced composite laminates. Some insights into modeling the size effects of open-hole composite laminates under in-plane tension and compression, the significance of ply-blocking and delamination are discussed. Recent interest in the interaction and migration of matrix cracks and delamination, resulting in development of integrated XFEM-CE and floating node methods will also be presented.

scholarly journals Designing and Preparation of Fiber-Reinforced Composites with Enhanced Interface Adhesion

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1128 ◽  
Author(s):  
Dengxun Ren ◽  
Lin Chen ◽  
Yue Yuan ◽  
Kui Li ◽  
Mingzhen Xu ◽  
...  
Keyword(s):  
Composite Laminates ◽  
Interfacial Adhesion ◽  
Polymer Networks ◽  
Great Influence ◽  
Interpenetrating Polymer Networks ◽  
Fiber Reinforced Composites ◽  
Resin Matrix ◽  
Differential Scanning Calorimetric ◽  
Reinforced Composites ◽  
Fiber Reinforced

The interfacial properties between fibers and resin matrices show great influence on the properties of fiber-reinforced composites. In this work, phthalonitrile containing benzoxazine (BA-ph) was chosen as the resin matrix, which combined with the glass fiber (GF) to prepare reinforced composite laminates at low temperature (200 °C). The poly(arylene ether nitrile) (PEN) was used to modify the GF and BA-ph matrix. Curing behaviors of the BA-ph/PEN were investigated with Differential scanning calorimetric (DSC) and Dynamic rheological analysis (DRA), and results indicated that the polymerization would be hindered by PEN due to the dilution effects. Moreover, the formation of triazine rings which assigning to the ring-forming polymerization of nitrile groups in BA-ph and PEN could improve the compatibility of BA-ph and PEN in the matrix. The SEM images of the fracture surface of the composites revealed that the brittleness of BA-ph matrix and interfacial adhesion between GFs and matrix was improved. The enhanced interfacial adhesion was detailedly discussed from the perspective of physical entanglement and the copolymerization between PEN chains on the surface of GFs and BA-ph/PEN matrix. The results of DMA also explained the toughness of BA-ph/PEN matrix, the semi-interpenetrating polymer networks and the interfacial adhesion. In sum, a feasible strategy that modifies the surface of GFs and the brittleness of the thermosetting matrix by high-performance thermoplastic polymers, which can be employed to prepare the composite laminates with improved properties.

scholarly journals Dissolvable thermoplastic interleaves for carbon nanotube localization in carbon/epoxy laminates with integrated damage sensing capabilities

2016 ◽  
Vol 17 (1) ◽  
pp. 59-66 ◽  
Author(s):  
Han Zhang ◽  
Yi Liu ◽  
Menglong Huang ◽  
Emiliano Bilotti ◽  
Ton Peijs
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Reinforced Composites ◽  
Reinforced Plastics ◽  
Damage Sensing ◽  
Carbon Nanotube Network ◽  
Liquid Resin Infusion ◽  
Carbon Fibre Reinforced Plastics ◽  
Fibre Reinforced Composites

A nano-engineered hierarchical composite with localized toughening and integrated damage sensing capabilities is described. Thermoplastic phenoxy interleaves which dissolve in epoxy resin upon heating and subsequently phase separate upon curing were employed as carrier films for localized deposition of carbon nanotubes in carbon fibre–reinforced plastics, avoiding filtration of carbon nanotubes during liquid resin infusion. Interlaminar fracture toughness was improved compared to reference epoxy-based laminates, while the introduced carbon nanotube network was utilized for in situ damage sensing purposes. Using this technology based on dissolvable thermoplastic carrier films, nanofillers can be easily introduced into fibre-reinforced composites at desired regions while simultaneously avoiding typical nanofiller drawbacks such as filtering or increased resin viscosity.

Fatigue Crack Growth Tests on Carbon Fibre Reinforced Aluminium Matrix Composites

2005 ◽  
Vol 473-474 ◽  
pp. 111-116
Author(s):  
Rita Karcagi ◽  
János Lukács
Keyword(s):  
Fatigue Crack ◽  
Composite Materials ◽  
Carbon Fibre ◽  
Aluminium Alloys ◽  
Aluminium Matrix ◽  
Matrix Composites ◽  
Reinforced Composites ◽  
Carbon Fibres ◽  
Aluminium Matrix Composites ◽  
Fibre Reinforced Composites

Composite materials combine the advantages of their components. Carbon fibre reinforced composites are used in construction where reduced weight is critical. To produce carbon fibre reinforced composites, aluminium alloys can be the matrix. Advantageous properties of aluminium matrix composites – good toughness, low weight – are applied in aerospace and automotive industry. Because aluminium alloys are not reactive to carbon, therefore the coating of the fibres can solve the problem. Nickel coated and chemically treated carbon fibres were used to producing of aluminium matrix composites. The investigated composite materials were prepared by pressure infiltration. The influence of treating of carbon fibres was examined on the fracture mechanical properties of aluminium matrix composites. Three types of matrix materials, three types of carbon fibres and four types of surface treatment were studied. Fatigue crack growth tests were performed under mode I loading condition and the failure mechanisms of the composite materials were investigated. Test results belonging to different coated fibres were compared, and our results were compared with the results from the literature, too.

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