scholarly journals Interlaminar Toughening of Epoxy Carbon Fiber Reinforced Laminates: Soluble Versus Non-Soluble Veils

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1029 ◽  
Author(s):  
Giulia Ognibene ◽  
Alberta Latteri ◽  
Salvatore Mannino ◽  
Lorena Saitta ◽  
Giuseppe Recca ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Fiber Composites ◽  
Mechanical Analysis ◽  
Resin Matrix ◽  
Carbon Fiber Composites ◽  
Resin Infusion ◽  
Cantilever Bending ◽  
Toughness Improvement ◽  
Fiber Reinforced Laminates

This work describes the evaluation of different interlaminar veils to improve the toughening of epoxy/carbon fiber composites manufactured by resin infusion. Three commercial veils have been used in the study: two electro spun thermoplastic nanofiber (Xantulayr® from Revolution Fibres) with different areal weight, and one micro carbon fibers veil (Optiveil® from TFP). Two laboratory made veils were also manufactured by electrospinning commercial polyethersulfone (PES) tougheners (Virantage by Solvay). The veils were selected to be either soluble or non-soluble in the epoxy resin matrix during curing. The solubility was analyzed by scanning electron microscopy and dynamic mechanical analysis testing on the cured laminates. The fracture energy was evaluated by double cantilever bending (DCB) testing under Mode I loading. The insoluble thermoplastic nanofibers showed the highest toughening efficiency, followed by the soluble nanofiber veils. The carbon fiber based veil showed no toughness improvement.

Role of graphene oxide surface chemistry on the improvement of the interlaminar mechanical properties of resin infusion processed epoxy-carbon fiber composites

2017 ◽  
Vol 39 (S4) ◽  
pp. E2116-E2124 ◽  
Author(s):  
Gloria Ramos-Fernandez ◽  
María Muñoz ◽  
Juan C. García-Quesada ◽  
Iluminada Rodriguez-Pastor ◽  
Ignacio Martin-Gullon
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Carbon Fiber ◽  
Surface Chemistry ◽  
Fiber Composites ◽  
Oxide Surface ◽  
Carbon Fiber Composites ◽  
Resin Infusion

scholarly journals Адитивне формування вуглекомпозитів на основі L-полілактиду

2020 ◽  
Vol 140 (6) ◽  
pp. 104-111
Author(s):  
Р. Ш. Іскандаров ◽  
Н. В. Сова ◽  
Б. М. Савченко ◽  
І. І. П'ятничук ◽  
В. А. Татаренко
Keyword(s):  
Tensile Strength ◽  
Additive Manufacturing ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Polymer Matrix ◽  
Fiber Composites ◽  
Carbon Composite ◽  
Test Method ◽  
Carbon Fiber Composites ◽  
Injection Molded

Study of the FFF additive manufacturing process of composite material based on L – polylactide (PLLA) with ultra-short carbon fibers. Tensile strength and elongation at break for all test specimens were determined according to ISO 527. Tensile modulus - ASTM D638-10, specimen density - PN-EN ISO 1183, microscopic examination - according to ASTM E2015 - 04 (2014). Charpy Shock Tests ISO 179 and ASTM D256. Bending test method ISO 178 and ASTM D 790. The rational modes of FFF additive manufacturing (AM) of carbon fiber composite based on PLLA was established. Properties of carbon fiber PLLA and unfilled PLLA was determinated for AM formed samples and injection molded samples. Carbon fiber composites have significantly higher flexural and tensile module us values compared to the original L-polylactide, which is due to the effect of polymer matrix reinforcement by the fibrous component. However, finished products obtained by AM PLLA carbon composite have a lower impact strength and tensile strength, which is likely to be due to the fact that the carbon fibers are short (50-60 mkm) and have a cavitations effect during injection molding and AM. Density of carbon fiber filled PLLLA was lower the theoretically calculated value for filament material as well for injection molded and AM formed samples. Density reduction probably the main cause of impact properties deterioration due to cavity forming around carbon fibers. Density and tensile properties of AM formed samples can be changed by AM slicing parameter – extrusion multiplier. Cavitation effect for carbon fiber composites observed for PLLA composite in form AM filament, injection molded parts and AM formed samples. Cavity forming was confirmed by optical microscopy and density measurement. Possible reason for cavity forming is orientation deformation of the fiber in polymer matrix during the formation of the filament. The effect of cavitation also persists in the AM of products from carbon composites due to the passage of the orientation at the exit of the printer nozzle.  The possibility of regulating the density and physical and mechanical properties of carbon composite products obtained by the additive manufacturing method has been established. Selection of rational values of the extrusion multiplier and the direction of the layers in the additive molding allows you to create products with the desired complex of properties.

Reinforced interface and mechanical properties of high strength carbon fiber composites

2020 ◽  
pp. 095400832095739
Author(s):  
Zibao Jiao ◽  
Zhengjun Yao ◽  
Jintang Zhou ◽  
Pengshu Yi ◽  
Chuanjun Lu
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Epoxy Resin ◽  
Carbon Fibers ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Resin Matrix ◽  
Carbon Fiber Composites ◽  
Epoxy Resin Matrix ◽  
Winding Tension

Based on the surface analysis of carbon fiber, an epoxy resin matrix with good wettability to carbon fibers had been developed and studied, and the influence of winding tension on the interface and mechanical properties of the composite were studied. The surface morphology of carbon fiber and the active functional groups of sizing agent were analyzed. In order to form a good interface combination, the wettability between carbon fibers and epoxy resin matrix was characterized by dynamic contact angle. The winding tension played an important role in the mechanical properties of composites. Therefore, a kind of carbon fiber reinforced composites, Naval Ordnance Laboratory (NOL) rings were fabricated using different winding tensions. Particularly, when the winding tension was 30 N, the interfacial bonding between carbon fibers and resin matrix was the most compact and firm. The tensile strength and interlaminar shear strength (ILSS) of NOL rings reached high values, 2712 MPa and 75 MPa, respectively.

Grafting carbon nanotubes densely on carbon fibers by poly(propylene imine) for interfacial enhancement of carbon fiber composites

Carbon ◽  
2020 ◽  
Vol 158 ◽  
pp. 704-710 ◽  
Author(s):  
Qiang Chen ◽  
Qingyu Peng ◽  
Xu Zhao ◽  
Hao Sun ◽  
Shasha Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
Poly Propylene

scholarly journals Structure, Mechanical and Thermal Properties of Polyphenylene Sulfide and Polysulfone Impregnated Carbon Fiber Composites

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 684 ◽  
Author(s):  
Chukov ◽  
Nematulloev ◽  
Zadorozhnyy ◽  
Tcherdyntsev ◽  
Stepashkin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Fiber Composites ◽  
Chemical Oxidation ◽  
Interfacial Interaction ◽  
Polyphenylene Sulfide ◽  
Carbon Fiber Composites ◽  
Mechanical And Thermal Properties ◽  
Thermal And Mechanical Properties

The paper studies new high-temperature thermoplastic impregnated unidirectional carbon fiber composites. The research focuses on the effect of thermal and chemical oxidation of the carbon fibers surface on the interfacial interaction between fibers and polysulfone and polyphenylene sulfide as well as thermal and mechanical properties of the composites. The research reveals the interaction between carbon fibers and the polymer matrix depend both on the type of surface treatment and nature of the polymer. The chemical oxidation of carbon fibers results in good interfacial interaction, and the best mechanical properties were observed for tows impregnated with polyphenylene sulfide.

Influence of Time Evolution in the Modulus of Elasticity of Concrete Reinforced by Carbon Fibers

2015 ◽  
Vol 1088 ◽  
pp. 640-643
Author(s):  
Letícia Couto Aguiar ◽  
Luiz A. Melgaço N. Branco ◽  
Eduardo Chahud ◽  
Francisco Antonio Rocco Lahr ◽  
André L. Christoforo ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Carbon Fiber ◽  
Behavior Analysis ◽  
Time Evolution ◽  
Carbon Fibers ◽  
Modulus Of Elasticity ◽  
Strain Difference ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
Axial Strength

The modulus of elasticity is an important property for the behavior analysis of concrete structures. This research evaluated the strain difference between concrete specimens with and without the application of laminate carbon fiber composites as well as the variation time, in months, of the axial strength compression and modulus of elasticity. Through the experimental results, it is concluded that increases in compressive strength and modulus of elasticity are more significant in the specimens without reinforcement.

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