PL
 |
EN
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 8

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available The impact of polyester-glass recyclate on the hardness and structure of composites
Panasiuk Katarzyna, Kyzioł Lesław, Abramczyk Norbert, Hajdukiewicz Grzegorz
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2019
|
nr 59 (131)
22--26
EN
The attractive characteristics of polyester-glass composites have led to their use in many industries, but using them as structural elements requires knowing their mechanical properties. This paper presents processing methods of polyester and glass scrap and their use in the production of new composites. This scrap, called the recyclate, was pre-crushed, ground, and then passed through sieves to obtain the desired fractions. Composite materials with added recyclate were made by hand lamination. Composites were made and then used to conduct appropriate tests to determine the degree of cure of the resin, and to determine the effect of the polyester-glass recyclate content on the hardness of composites. For this purpose, rectangular panels with a thickness of g = 8 mm were produced by manual lamination. Each plate contained 0% glass mat, 10% resin, and 20% recyclate with granulation ≤ 1.2 mm and ≤ 3 mm. Then, test samples were formed from each plate. Hardness measurements were performed using the ball-pressing method. In addition, structural studies were carried out to determine the correlation between the structural and mechanical properties of the discussed materials. The obtained test results showed that the recyclate content and its granulation clearly affected the mechanical properties of the tested composite materials.
2
Content available Analysis of the cracking process of layered composites with polyester-glass recyclate using dynamic tests
Panasiuk Katarzyna, Kyzioł Lesław, Hajdukiewicz Grzegorz
Zeszyty Naukowe Akademii Morskiej w Szczecinie
|
2019
|
nr 57 (129)
73--78
EN
Layered composites are materials that are widely used in industry due to their low manufacturing costs. They are used, among others, as a construction material for the construction of light aircraft, cars, wind turbine blades and the hulls of vessels. The universality of their use has contributed to the formation of a large amount of post-production and post-use waste from these composites. Layered composites, using recycled polyester and glass, or recycled composite waste, may be materials that could be used in the economy. The polyester-glass waste used in the composite was created by crushing and then grinding and sieving to obtain the appropriate granulation. Materials with a waste content of 0%, 10%, 20% and with granulation of this waste of ≤ 1.2 mm were made using the hand lamination method. Test specimens were prepared from the material plates that were obtained in accordance with the PN-EN ISO 179-1: 2010E standard (Plastics – Charpy Impact Assessment – Part 1: Non-instrumental impact test). Impact tests of samples were carried out according to the above-mentioned standards using a Zwick Roell RKP450 swinging hammer. Test bench instrumentation and software enabled the bending forces to be recorded, as well as the deflection of the samples for short time intervals and displacement, so a detailed force-deflection graph could be obtained. During the analysis, the results of the research were focused on describing the kinetics of the process where the samples were destroyed (fracture mechanics), this allowed for the initial determination of the material’s resistance to dynamic loads. The results obtained showed that the increase of the recycled content in the produced composite contributed to the lowering of the destructive force threshold in the impact tests, as well as the simultaneous increase of the plasticity of the material. The increase of the sample’s deflection with the occurrence of the maximum force resulted in the energy of the elastic state being increased (Ue).
3
Content available remote The use of acoustic emission signal (AE) in mechanical tests
Panasiuk Katarzyna, Kyzioł Lesław, Dudzik Krzysztof
Przegląd Elektrotechniczny
|
2019
|
R. 95, nr 11
8--11
EN
The article presents the possibilities of using the acoustic emission signal in mechanical tests. A static tensile test of the polyester-glass composite samples was carried out with simultaneous recording of the acoustic emission signal generated in the loaded material by means of a connected piezoelectric sensor (PAC system). The acoustic waves created inside the loaded material were processed by a sensor placed directly on the sample and recorded in the form of a digital signal in the recording device. This signal was subjected to further processing and the RMS values were plotted as a function of time, the obtained graphs were applied to stretching curves. Comparison of RMS and tensile plots allows for very accurate identification of processes occurring in the structure of the tested material subjected to loading.
PL
W artykule przedstawiono możliwości wykorzystania sygnału emisji akustycznej w badaniach mechanicznych. Przeprowadzono statyczną próbę rozciągania próbek z kompozytu poliestrowo-szklanego z jednoczesną rejestracją sygnału emisji akustycznej generowanego w obciążanym materiale za pomocą podłączonego czujnika piezoelektrycznego (system PAC). Fale akustyczne powstałe we wnętrzu obciążanego materiału zostały przetworzone przez czujnik umieszczony bezpośrednio na próbce i zarejestrowane w formie sygnału cyfrowego w urządzeniu rejestrującym. Sygnał ten poddany został dalszej obróbce i na jego podstawie sporządzono wykresy wartości skutecznej sygnału elektrycznego (RMS) w funkcji czasu, uzyskane wykresy naniesiono na krzywe rozciągania. Porównanie wykresów RMS i rozciągania pozwala na bardzo dokładną identyfikację procesów zachodzących w strukturze badanego materiału poddanego obciążeniu.
4
Content available Effect of the recyclate on a deflection of composites in bending
Panasiuk Katarzyna, Kyzioł Lesław, Hajdukiewicz Grzegorz
Journal of KONES
|
2019
|
Vol. 26, No. 4
197--203
EN
The aim of the research was to determine the effect of polyester-glass recyclate on the deflection of composite samples subjected to three-point bending. The polyester-glass recyclate was obtained from the part of the ship’s hull made of polyester-glass composite, constituting scrap metal. The pieces of scrap were pre-fragmented and then processed into a prepared stand for this purpose. Such a fragmented recycling will be used to make composites with different scrap / recycled content. For this purpose, research materials were made using the vacuum bag method with the percentage of 0%, 10% and 20% recyclate) as well as various granulation (i.e. 1.2 mm and 3.0 mm). The research material consisted of rectangular plates with a thickness corresponding to the thickness of the samples. The samples for testing were made by water cutting. The tests were carried out on a suitably prepared stand, which was made of a universal Zwick Roell testing machine and three-point bending handles and a dial indicator. The spacing of the supports has been determined in accordance with the binding standard for three-point bending. Obtained results from tests, i.e. strain, stress, deflection, deformation allowed analysing the impact of recyclate on bending strength and defining the deflection arrow. Based on the results obtained from three-point bending, it can be concluded that the polyester-glass recycling has an influence on the decrease of strength, stress and deflections of the tested composites.
5
Content available Composite materials for warship constructions
Kyzioł Lesław
Journal of KONES
|
2019
|
Vol. 26, No. 4
135--140
EN
The article presents the basic properties of composite materials used for the construction of special ships. Static and dynamic characteristics of materials such as wood and polyester-glass composites are presented. Noteworthy are materials such as surface modified wood and polyester-glass composites with the addition of recyclate. Composite materials are widely used materials for the construction of non-magnetic warships. The article describes the properties of surface modified wood with polymethyl methacrylate and a polyester-glass composite with the addition of recyclate. The recyclate is fragmented, milled polyester-glass scrap. The content of the recyclate greatly affects the mechanical properties of the composite. The properties of the composite with the addition of recyclate depend on the recyclate content as well as the production technology and size of the recycled granulates. The test results showed that the increase in the recycled content causes a decrease in the mechanical properties of the composite. However, it should be remembered that these materials originated from waste, waste that is not subject to self-degradation, which have a very negative impact on the natural environment. At present, where there is a very large pollution of the natural environment, the processing and management of huge amounts of composite waste is an essential goal. A significant amount of recyclate significantly reduces the mechanical properties of the composite; however, the same large amount of recycled material has been transformed and used. The manufactured material and its structural elements are still non-magnetic structures and can be used on a less loaded element. The choice of material for the construction of special ships elements is determined not only by its properties but also by knowledge, experience, method of processing, economic and technical risk.
6
Content available remote The analysis of the possibilities of using 3D printer for making components and parts of marine equipment for example flexible clutch coupling
Kyzioł Lesław, Kończewicz Włodzimierz, Dynowski Adrian
Journal of KONBiN
|
2019
|
Vol. 49, iss. 3
221--239
EN
The advantage of incremental techniques is the reduction of material losses as opposed to loss techniques, i.e. machining. The element of flexible insert of the flexible coupling was made with the use of the incremental technique using the FDM method made of ABS plastic and the exploitation tests of the performed insert were performed in the device simulating the operation of the thruster on the ship. The use of materials obtained from the recycling of plastic waste is of great importance for printing.
PL
Zaletą technik przyrostowych jest zmniejszenie strat materiałowych w odróżnieniu do technik ubytkowych tj. obróbki skrawaniem. Techniką przyrostową wykonano element wkładki elastycznej sprzęgła podatnego za pomocą metody FDM z tworzywa ABS i przeprowadzono badania eksploatacyjne wykonanej wkładki w urządzeniu symulującym działanie steru strumieniowego na statku. Duże znaczenie ma wykorzystanie do druku materiałów uzyskanych z recyklingu odpadów z tworzyw sztucznych.
7
Content available remote Application of the Kolmogorov-Sinai entropy in determining the yield point, as exemplified by the EN AW-7020 alloy
Kyzioł Lesław, Hajdukiewicz Grzegorz
Journal of KONBiN
|
2019
|
Vol. 49, iss. 3
241--269
EN
The article presents a method of determining the yield point, applying calculations based on the Kolmogorov-Sinai (K-S) metric entropy model. Data used in metric entropy calculations was obtained during a static tensile test of the AW-7020 aluminium alloy. The methodology of K-S entropy calculations was presented and illustrated by a selected example from a data collection. Analyzing the results obtained, the values of an arbitrary yield point were compared for R02 selected samples with the values of the yield point obtained using the metric entropy method ReK-S.
PL
W artykule przedstawiono sposób wyznaczania granicy plastyczności wykorzystując obliczenia oparte na entropii metrycznej Kołmogorow-Sinai (K-S). Dane do obliczeń entropii metrycznej uzyskano w czasie wykonania statycznej próby rozciągania stopu aluminium AW-7020. Opisano dokładnie metodologię obliczeń entropii K-S ilustrując ją wybranym przykładem ze zbioru danych. Analizując uzyskane wyniki porównano wartości umownej granicy plastyczności R R02 wybranych próbek z wartościami granicy plastyczności uzyskanymi metodą obliczenia entropii metrycznej ReK-S.
8
Content available Analysis of fracture toughness of structural timber. Part I. Theory and experimental tests
Kyzioł Lesław
Polish Maritime Research
|
2010
|
nr 3
53--58
EN
This paper presents fundamentals of fracture mechanics of anisotropic materials. Fracture toughness of anisotropic materials, e.g. structural timber, depends a. o. on state of stress, environment, temperature and changes due to ageing, therefore in such materials cracking process runs in various ways. Timber is characterized by eighteen coefficients which determine its fracture toughness in contrast to metals for which this number is as low as three. In this part of considerations a way of conducting the tests of specimens subjected to cracking as well results of the tests of natural and modified timber, are presented.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.