Increasing of winding effectivity of fiber prepregs aimed to improvement of mechanical properties of final composite parts

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24620%2F18%3A00005527" target="_blank" >RIV/46747885:24620/18:00005527 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.5185/cmc2018" target="_blank" >http://dx.doi.org/10.5185/cmc2018</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5185/cmc2018" target="_blank" >10.5185/cmc2018</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Increasing of winding effectivity of fiber prepregs aimed to improvement of mechanical properties of final composite parts

Popis výsledku v původním jazyce

The development of composite materials for weight reducing is a trend in transport and other industrial areas. The composition of the composite material generates a synergistic effect that provides their advantages. The composite consists of a dispersive and continuous phase. For composites different fibres (carbon, glass, basalt, textile, natural fibres) and plastic matrices with specific properties can be applied. The type, quantity and arrangement of fibres in the composite are designed for strength characteristics depending on the maximum applied load. Composites reinforced with filament layers (unidirectional fibres, woven, multiaxial knitted fabric, etc.) are often used for very good mechanical properties. Samples of the composite material were made by fibre winding technology on nonbearing core with required geometry. An image analysis of the structure and morphology was performed by scanning electron microscopy (SEM). The study of matrix penetration among fibres has shown that the directional fibre winding production technology in the case of uncontrolled winding significantly affects the resulting ratio between fibre and matrix area. This was reflected in the standard tensile, bending and impact tests by a reducing of mechanical properties of the resulting composite. Insufficiently saturated areas create the source of defects and crack propagation in the composite. Cracks can cause a delamination – a separation of layers. Model simulations for optimal fibre winding were made for increasing of mechanical properties without increasing the weight of the composite. Mechanical properties were determined from numerical models. The nature of strain and stress distribution in individual layers have been identified. Composite samples were made of glass fibres and an epoxy resin. The results of the mechanical tests were compared with the numerical model. A comparison of experimental results and numerical models shows that fully controlled winding allows to increase mechanical characteristics of the resulting composite. The cause can be found in the optimal distribution of the fibres in the composite. The 2D model was created in software SolidWorks where and then imported to ANSYS software. The filling area value was determined on selected cross-sections of composite using the model. The model was compared with the filling area values that was obtained from the image analysis. The composites were loaded by a different type of loading. The model describes the response of glass fibres in the individual layer and whole composite as well. The model results show the stress and deformation in critical areas for a prediction of cracks and defects.

Název v anglickém jazyce

Increasing of winding effectivity of fiber prepregs aimed to improvement of mechanical properties of final composite parts

Popis výsledku anglicky

The development of composite materials for weight reducing is a trend in transport and other industrial areas. The composition of the composite material generates a synergistic effect that provides their advantages. The composite consists of a dispersive and continuous phase. For composites different fibres (carbon, glass, basalt, textile, natural fibres) and plastic matrices with specific properties can be applied. The type, quantity and arrangement of fibres in the composite are designed for strength characteristics depending on the maximum applied load. Composites reinforced with filament layers (unidirectional fibres, woven, multiaxial knitted fabric, etc.) are often used for very good mechanical properties. Samples of the composite material were made by fibre winding technology on nonbearing core with required geometry. An image analysis of the structure and morphology was performed by scanning electron microscopy (SEM). The study of matrix penetration among fibres has shown that the directional fibre winding production technology in the case of uncontrolled winding significantly affects the resulting ratio between fibre and matrix area. This was reflected in the standard tensile, bending and impact tests by a reducing of mechanical properties of the resulting composite. Insufficiently saturated areas create the source of defects and crack propagation in the composite. Cracks can cause a delamination – a separation of layers. Model simulations for optimal fibre winding were made for increasing of mechanical properties without increasing the weight of the composite. Mechanical properties were determined from numerical models. The nature of strain and stress distribution in individual layers have been identified. Composite samples were made of glass fibres and an epoxy resin. The results of the mechanical tests were compared with the numerical model. A comparison of experimental results and numerical models shows that fully controlled winding allows to increase mechanical characteristics of the resulting composite. The cause can be found in the optimal distribution of the fibres in the composite. The 2D model was created in software SolidWorks where and then imported to ANSYS software. The filling area value was determined on selected cross-sections of composite using the model. The model was compared with the filling area values that was obtained from the image analysis. The composites were loaded by a different type of loading. The model describes the response of glass fibres in the individual layer and whole composite as well. The model results show the stress and deformation in critical areas for a prediction of cracks and defects.

Druh

O - Ostatní výsledky

CEP obor

—

OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

<a href="/cs/project/LO1201" target="_blank" >LO1201: ROZVOJ ÚSTAVU PRO NANOMATERIÁLY, POKROČILÉ TECHNOLOGIE A INOVACE TECHNICKÉ UNIVERZITY V LIBERCI</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů