Temat: polymer composite - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Method of determining the structural parameters of wood-polymer composite
Autorzy:: Kyzioł, L.
Murawski, L.
Powiązania:: https://bibliotekanauki.pl/articles/242880.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: modified wood
wood-polymer composite
methyl methacrylate
material constants
soft layers, hard layers
Opis:: A composite material consisting of woody skeleton and polymerized methacrylate has been developed and characterized. This paper presents an experimental program and the results concerning mechanical properties and strength of wood modified with polymerized methacrylate. In the article, there are examples of structural elements made of natural wood. Wood is a composite consisting of the layers of soft and hard wood. Wood is a composite and porous material. The porosity, which is a serious defect of wood, may be simultaneously its advantage. Wood saturation with different impregnates to minimize its disadvantages. If the wood pores will fill the monomer there is obtained the wood polymer composite. This composite is classified as of fiber composites. Such composite is effectively protected against degradation; it is durable in use, and show an improvement in mechanical properties. Design constructions of surface modified wood require the determination of fundamental material constants. Therefore, for the determination of these parameters is very important obtaining the appropriate research material. The surface impregnation of wood allows obtaining strength characteristics in a function of polymer content. This allows to model it's, and then design and perform specific ship structures. In the wood, there are three directions in relation to the annual rings. Wood properties, especially mechanical properties, are different in the selected directions. For the computation takes the orthogonal anisotropy in which there are three mutually orthogonal planes of symmetry, for which there is symmetry properties of the wood.
Źródło:: Journal of KONES; 2014, 21, 2; 177-184
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Strength property of polymer - wood composite
Autorzy:: Murawski, L.
Kyzioł, L.
Powiązania:: https://bibliotekanauki.pl/articles/241769.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: wood
polymer
composite
finite element method
marine materials
Opis:: Wood is one of the oldest construction materials. Nowadays, in the shipbuilding industry wood is almost forgotten. Wood has a lot of advantages in comparison to other materials, e.g. steel. However, some of wood characteristics are inconvenient. Layers are integrated part of wood construction - it is a natural composite. It is a big advantage of the wood, but there is too big difference between soft and hard wood's layer. Modified wood might be very interesting “new” material for marine industry. Especially, polymer-wood composite seems to be very promising. One of the authors developed surface saturation methodology of the wood by polymer. Several measurement tests were performed. Some of the new material characteristics have been specify as a results of the tests. Stiffness and averaged material constants have been determined as well as material data of separate composite layers. The experiments were simulated by numerical calculations. Numerical analysis was compared with measurements. After model verification, several other analyses (e.g. detailed stress distribution in the composite) were performed. That kind of analysis of material data where very difficult, or even impossible, for obtain by measurements. Numerical analysis was performed by Patran-Nastran commercial software based on Finite Element Method. The authors plan to use experimental and calculations data for more specified analysis (included dynamic analysis) and plan to improve that polymer-wood composite can be used in marine industry with benefits.
Źródło:: Journal of KONES; 2014, 21, 2; 227-234
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Analysis of abrasive wear of selected aircraft materials in various abrasion conditions
Autorzy:: Krzyżak, A.
Mucha, M.
Pindych, D.
Racinowski, D.
Powiązania:: https://bibliotekanauki.pl/articles/242294.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: composite materials
tribology
carbon fibre reinforced polymer
CFRP
aerospace materials
Opis:: The use of composite materials is continuously increasing in modern transport. This process is especially noticeable in aviation. The mass percentage of epoxy resin composites in contemporary aircraft constructions is usually higher than 50%, and these materials must meet increasingly demanding requirements. In these circumstances, in addition to mass and strength, it is necessary to predict other properties of the material, such as abrasion resistance. The article presents the analysis of the process of abrasion of carbon fibre reinforced polymers reinforced with various fillers. Straight carbon fibre mats were used for the tests. In addition, powders of pumice, alumina, silicon carbide, and glass microspheres at various concentrations in relation to the matrix were used as fillers. In order to investigate the influence of external factors on the abrasion process, each group of samples was subjected to abrasion under different external conditions: in an insulated environment, in the presence of water and loose abrasives: brown fused alumina (BFA) and white fused alumina (WFA). The measurements were carried out using a precision balance and an electron microscope. The results allow concluding on which kind of filler and in what concentration contributes to improvement of the abrasion resistance of the composite material the most. In addition, it was found that the conditions in which abrasion occurs have a very large impact on the course of this process.
Źródło:: Journal of KONES; 2018, 25, 4; 217-222
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Electrical properties study of fibre reinforced polymeric materials used in aircraft structures
Autorzy:: Porras, S.
Mucha, M.
Powiązania:: https://bibliotekanauki.pl/articles/241579.pdf
Data publikacji:: 2018
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: composite materials
electrical conductivity
carbon fibre reinforced polymer
CFRP
glass fibre reinforced polymer
GFRP
aerospace materials
lightning strike protection
LSP
Opis:: Aircraft are exposed to lightning strikes. Lightning strike protection (LSP) devices involve additional weight of the aircraft. Therefore, multifunctional materials that allows the conductivity of electrical current and, simultaneously, holds the mechanical properties required to withstand the typical conditions for an aerospace material are widely researched. A typical resin used in aviation is an insulator, so main research is done to reduce its resistance. On the other hand, the type of reinforcement can have a large influence on the electrical conductivity in the plane of reinforcement. The aim of the article is to evaluate the effect of the type and the basis weight of reinforcement on the electrical conductivity. For this purpose, with the use of a hydraulic press, different four-layer composites based on epoxy resin were produced. Each differing is in combination of carbon, glass layers and their basis weight (from 48 kg/m2 to 245 kg/m2 ). The measuring proceedings were carried by an RMS multi meter and, more accurate, by an LCR meter with 4 selectable test frequencies. The measurements were made both along the strand fibres and at a 45-degree angle. The results made it possible to determine which reinforcement of aircraft composites should be selected at the aircraft design level to provide increased electrical conductivity along the reinforcement fibres and thus influence one of the factors affecting the protection of the aircraft against the effects of lightning
Źródło:: Journal of KONES; 2018, 25, 4; 347-353
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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