Temat: fiber composite - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Unconventional Methods of Joining Composites and Metals in the Context of Weight Reduction of Car Bodies
Autorzy:: Sabadka, Dušan
Kender, Štefan
Tematy:: weight reduction
carbon fiber
carbon fiber composite
composites
bonded joint; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/2201891.pdf Link otwiera się w nowym oknie
Opis:: One of the basic trends in the automotive industry today is to achieve the most acceptable ratio between the total weight of the car to its overall performance and utility properties. Reducing the weight of cars is largely due to the use of new materials, where composite materials offer a wide space for their application. Composite materials have their specific properties which is very beneficial in reducing the total weight. Another advantages is strength, stiffness, low fiber density, the ability to form them into any shape based on the required applications. One of the challenges associated with the use of composite materials is the search for new technological possibilities of joining composite materials with metals. These include technologies as for example riveting, ultrasonic welding, but especially gluing. Bonding is currently one of the most preferred ways of joining composite materials. The paper deals with testing of technology of bonding composite materials with metals used in the manufacture of automobiles and a comparison of individual results obtained from the experiment.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Variable Sound Insulation Structure with MFC Elements
Autorzy:: Górski, P.
Kozupa, M.
Tematy:: sound insulation
active noise reduction
macro fiber composite (MFC); Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/177289.pdf Link otwiera się w nowym oknie
Opis:: Additional sound sources are used as actuators in the vast majority of active noise reduction systems. One of the possible opportunities to extend the field of applications of active noise reduction systems is using active structures of variable sound insulation. The paper presents an analysis of ways of reducing noise with a structure of variable sound insulation consisting of a metal plate, active elements (Macro Fiber Composite), and a control system. The paper presents results of acoustic radiation simulations and measurements of sound intensity generated by the structure under the influence of stimulation by an acoustic wave. Simulations of mechanical vibrations and acoustic radiation for the plate were performed with the finite element method and ANSYS software. Simulation results made it possible to select locations for gluing the active elements and sensors. Analyses of the sound pressure level in the space to which the plate is radiating made it possible to determine dominant frequencies in the characteristics and, as a result, indicate vibration modes that can be reduced. Sound intensity measurements were performed with a three-way probe of USP mini Microflown. Results of simulations and measurements show that it is possible to achieve an improvement of the insulating power of a metal plate by approx. 10 dB.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Characteristic Investigation of Macro Fiber Composite Structure Using FE Model
Autorzy:: Saravanan, M. P.
Marimuthu, Krishnaswamy
Jayabal, Kaliappan
Tematy:: macro-fiber composite
finite-element model
piezoelectric composite
ANSYS
RVE method; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2049129.pdf Link otwiera się w nowym oknie
Opis:: In this investigation, the effective mechanical, coupling and dielectric properties of Macro-fiber-composites (MFCs) consisting of piezorod-element constituents are determined using representative volume element method combined with finite element analysis. Experiments are conducted on piezo-bar-element MFCs to understand the applicability of the proposed approach which would later be extended to composites with modified geometric pattern. The longitudinal strains with respect to static deflections of beam and forced displacements under varying electrical loads are measured for the MFCs, and compared with the numerical simulations. Based on the good agreement from the result comparisons of piezo-bar-element MFCs, the effective material properties of piezo-rod-element MFCs are numerically determined based on the RVE approach.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Experimental and finite element analysis of PPF controller effectiveness in composite beam vibration suppression
Autorzy:: Mitura, Andrzej
Gawryluk, Jaroslaw
Tematy:: finite element method
positive position feedback control
composite structures
hysteresis
phenomenon
macro-fiber composite; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Powiązania:: https://bibliotekanauki.pl/articles/2172029.pdf Link otwiera się w nowym oknie
Opis:: In this paper the problem of vibration reduction is considered. Generally, mechanical vibrations occurring during the operation of a system are undesirable and may have a negative effect on its reliability. A finite element model of a single active blade is developed using the Abaqus software. This structure consists of a multi-layer glass-epoxy composite beam with an embedded macro fiber composite (MFC) piezoelectric actuator. For vibration control the use of a positive position feedback (PPF) controller is proposed. To include the PPF controller in the Abaqus software, a special subroutine is created. The developed control algorithm code makes it possible to solve an additional differential equation by the fourth order RungeKutta method. A numerical dynamic analysis is performed by the implicit procedure. The beam responses with and without controller activation are compared. The control subsystem model also includes the hysteresis phenomenon of the piezoelectric actuator. Numerical findings regarding the PPF controller’s effectiveness are verified experimentally.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Analysis of Optimization Parameters for Plastic Injection Process Molding by Genetic Algorithm
Autorzy:: Janmanee, Pichai
Saodaen, Rattikorn
Nimvongsa, Jedsadapong
Tematy:: carbon fiber composite plastic 66
connector assemblies
short-shot
genetic method; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59112186.pdf Link otwiera się w nowym oknie
Opis:: Purpose: to analyze the optimum parameters in the injection molding of carbon fiber 66 (PA66) composite resin obtained from the injection molding process of the electrical connector assembly. Design/methodology/approach: Experimental research will examine relevant parameters uti lizing experimental design based on the Genetic Algorithm Method. Findings The optimum parameters in the injection molding process are Injection Pressure at 110 MPa, Holding Pressure at 55 MPa, Holding Time at 1.0 sec, Injection Speed at 40 mm/s, Injection Stroke at value 15 mm, which will make the results of the injection workpiece pro duced from the injection machine be the length that is in the standard value. Practical implications: The findings improved the molding problem: Short shot problem enhanced by 1.15%; Weld line problem improved by 0.38%; Silver mark problem enhanced by 0.11%. Originality/value: Decrease the defect from a short shot problem in the injection molding process to save time and reduce production costs.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Zużycie ścierne kompozytów włóknistych
The abrasive wear of fibrous composites
Autorzy:: Kałwak, B.
Baier, A.
Tematy:: kompozyt włóknisty
zużycie ścierne
wagon towarowy
fiber composite
abrasive wear
freight truck; Pokaż więcej
Wydawca:: Politechnika Śląska
Powiązania:: https://bibliotekanauki.pl/articles/409057.pdf Link otwiera się w nowym oknie
Opis:: Ze względu na liczne zalety materiałów kompozytowych coraz częściej stosowane są jako zespoły i podzespoły środków technicznych. Na szczególną uwagę zasługują wytwarzane z materiałów polimerowych produkty o budowie warstwowej. Połączenie ze sobą różnych materiałów polimerowych, a także materiałów polimerowych z innymi materiałami np. metalami zapewnia dzięki swej strukturze korzystne kształtowanie własności mechanicznych eksploatacyjnych oraz estetycznych wytworzonych z nich produktów [1]. Niezbędnym jest zapewnienie wzajemnej przyczepności każdej z warstw. Zjawisko zużycia ściernego jest jednym z kluczowych parametrów określających mechaniczne własności materiału. Materiały będące obiektem badań mają docelowo znaleźć zastosowanie do budowy burt wagonów towarowych. Istotnym elementem zaprojektowanego stanowiska badawczego jest rzeczywiste odwzorowanie warunków panujących podczas transportu materiałów wagonem towarowym. W artykule przedstawiono metodologię badań zużycia ściernego materiałów polimerowych o budowie warstwowej.
The effect of abrasive wear is one of the fundamental parameters of defining properties of material. The materials used in the building of freight truck boards (treference to an abrasive environment) have to fulfill high requirements because of the abrasive properties. The key element in designing the research workshop is simulating the actual conditions during the transportation of materials in freight trucks. In this article the research methodology concerning the wear of abrasive fibrous composites is presented.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Natural jute laminate for the improvement of strength properties of concrete specimen
Autorzy:: Zulfikar, Achmad Jusuf
Yaakob, Mohd Yuhazri
Umarfaruq, Hel Mee
Syah, Rahmad
Tematy:: natural fiber composite
jute fabric
compressive strength
splitting tensile strength
vacuum bagging.; Pokaż więcej
Wydawca:: Instytut Podstawowych Problemów Techniki PAN
Powiązania:: https://bibliotekanauki.pl/articles/38912467.pdf Link otwiera się w nowym oknie
Opis:: In the last decade, the exploration and investigation of natural ingredients as alternative materials for metal substitutes have been continuously conducted to produce eco-friendly products with sufficiently good strength. The climate and geography of countries like Indonesia provide that such materials are available abundantly and can be easily replanted. Thus, these materials have considerable potential for application in various products. The purpose of this study is to analyze the compressive and tensile strength of a cylindrical column concrete structure reinforced externally with laminate composite materials derived from jute fabric sheets. The specimen manufacturing method uses a vacuum bagging technique with the specimen size specified in the ASTM C39 test standard. After manufacturing, the specimens underwent the treatment of immersion in clean water for 28 days, followed by drying at room temperature for additional 28 days. The column concrete specimens were wrapped with laminate composite materials with variations in several layers of jute fabric. Compressive strength and splitting tensile tests were conducted according to ASTM C39 and ASTM C496 test standards, respectively. The test results showed that applying laminate composite sheaths on the outer surface of the column concrete structure resulted in an increase in strength of up to 100% for both compressive strength and splitting tensile strength. The magnitude of such an increase in strength is reported in this article.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Properties of composites incorporating cellulosic fibers
Autorzy:: Hospodarova, V.
Stevulova, N.
Vaclavik, V.
Dvorsky, T.
Tematy:: cellulosic fiber
building material
fiber cement composite
density
mechanical properties; Pokaż więcej
Wydawca:: Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/104465.pdf Link otwiera się w nowym oknie
Opis:: Nowadays, with the understanding of the importance of the green building concept, there is a constantly increasing demand for ecological construction materials. The application of raw materials from renewable sources such as wood, plants and waste to building materials preparing has gained a significant interest in this research area. With the consideration of environmental consciousness, natural fibers are biodegradable so as they can alleviate the problem of massive solid waste produced and relief the pressure of landfills, they are used for replacing other non-degradable materials for product development. In this experimental work, wood pulp and recycled waste paper fibers in addition 0.2%, 0.3% and 0.5% were used. The fiber cement composites were subjected to a characterization of their composition including the assessment of a complex set of basic physical and mechanical properties after 7 and 28 days of hardening. Experimental results show that application of small amount of cellulosic fibers lead to a reduction of density up to 6% when compared with the reference composite. However, cement composites based on wood pulp showed better mechanical properties such as compressive and flexural strength in comparison with cement composites with recycled waste paper fibers.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Enhanced broadband tri-stable energy harvesting system by adapting potential energy – experimental study
Autorzy:: Koszewnik, Andrzej
Ambrożkiewicz, Bartłomiej
Tematy:: macro-fiber composite
homogenized material
conventional TPEH
improved TPEH system
tailoring potential energy; Pokaż więcej
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Powiązania:: https://bibliotekanauki.pl/articles/58907169.pdf Link otwiera się w nowym oknie
Opis:: This paper presents the process optimization of some key parameters, such as the size of the air gap and distance between fixed neodymium magnets to enhance the vibration-based energy harvesting effect in the tri-stable energy harvesting systems and the improved tri-stable energy harvesting system being the proposed solution under weak excitation. In order to do it, firstly the distributed parameters model of the magnetic coupling energy harvesting system, including macro fiber composites of the 8514 P2 with a homogenous material in the piezoelectric fiber layer and nonlinear magnetic force, was determined. The performed numerical analy-sis of the conventional and the improved tri-stable energy harvesting system indicated that introducing an additional magnet to the tri-stable system leads to the shallowing of the depth of a potential well by decreasing the air gap between magnets and consequently generating higher power output and improving the effectiveness of the proposed improved tri-stable energy harvesting system. Experiments carried out on the laboratory stand allowed us to verify the numerical results as well as determine the optimal param-eters of the magnetic coupling system. Due to it, the effectiveness of the proposed system versus the conventional tri-stable energy har-vesting system is most enhanced.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Piaski odpadowe jako wartościowe kruszywo do wytwarzania fibrokompozytów
Waste Sands as a Valuable Aggregates to Produce Fibre-composites
Autorzy:: Głodkowska, W.
Laskowska-Bury, J.
Tematy:: ekologia
piaski odpadowe
fibrokompozyt
włókna stalowe
właściwości
ecology
waste sands
fiber composite
steel fibers
properties; Pokaż więcej
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Powiązania:: https://bibliotekanauki.pl/articles/1818552.pdf Link otwiera się w nowym oknie
Opis:: In the paper an issue of waste sand utilization was raised. The heaps of waste sand located in Polish region Pomerania are by-product obtained during the process called hydroclassification of all-in-aggregate for concrete production. One of examples how to resolve the waste sand utilization problem could be its application for the production of steel fiber reinforced mineral composites. The authors introduced their tests results physical-mechanical properties of fibrous composites made on the basis of waste sands with different amounts of steel fibers. Steel fiber content is from 0 to 2.5% relative to the volume of the composite. The fibers in the mixture were arranged at random. Based on these results proposed composite of the best properties, which meets the requirements for construction materials. It was specified the exact composition of the material of this composite. For the selected composite steel fibre content of 1.2% of tests taken basic properties: compressive strength, tensile strength, residual strength, modulus of elasticity, shear strength, resistance to frost, resistance to abrasion. Tests were performed on samples having a side of 150 cubic mm and cylindrical with the dimensions 150x300 mm. Carried out research, literature studies and analysis of the obtained results allow to conclude that this material can be used for the performance of structural elements and thus creates a perspective on the use of waste aggregates. In view of the above, the large resources of small aggregates present in the form of waste could become a wealth for the region of Pomerania. Sands waste could become a basic component of materials intended for the manufacture of certain structural elements. The use of waste to produce aggregate composites constructional on a wider scale, and partial replacement of concrete simple-it such material can significantly reduce further degradation of the environment.
Dostawca treści:: Biblioteka Nauki

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