Temat: absorption energy - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Composite-polymer materials for energy-absorbing structures
Autorzy:: Barnat, W.
Niezgoda, T.
Ochelski, S.
Powiązania:: https://bibliotekanauki.pl/articles/246205.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: energy absorption structures
safety
composites
numerical simulation
energy absorption investigations
Opis:: On the basis of the results obtained from our own experimental investigations of energy- absorbing elements, the influence of the given factors on absorbed energy (WEA) was determined. The objects of the research were the samples made of epoxy composites reinforced with glass fibres formed in roving, roving stripes and glass mat as well as with carbon fibres formed in roving and carbon roving stripes. To investigate the capability of hitting energy absorption of the samples in the shape of tubes, the truncate cones and in the shape of a thin cuboid were taken under consideration. The sample in the shape of tubes, wavy coats and thin cuboids with angle 45° (on one edge), play the role of the initiator of progressive destruction process. The composites matrix was taken into account during investigations: epoxy, the vinyl-esters, polyetheretherketones, reinforced with carbon and glass fibres with different structures of the samples. The influence of the sample geometry and the orientation of the layers in carbon / epoxide and the ar amid / the epoxide composites on the WEA absorption value were presented in the papers. The comparison of the structures made f rom single elements with relevant structures of four elements shows that absorbed energy is accumulating. In this case the relative absorbed energy remains at the similar level.
Źródło:: Journal of KONES; 2009, 16, 1; 21-34
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Doświadczalna ocena zdolności pochłaniania energii kompozytów węglowo-epoksydowych i szklano-epoksydowych
Experimental assessment of energy absorption capability of carbon-epoxy and glass-epoxy composites
Autorzy:: Ochelski, S.
Gotowicki, P.
Powiązania:: https://bibliotekanauki.pl/articles/210122.pdf
Data publikacji:: 2007
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:: kompozyty polimerowe
energia absorpcji
badania doświadczalne
polymer composites
absorption energy
experimental testing
Opis:: W pracy opisano doświadczalne badania zdolności pochłaniania energii przez kompozyty węglowo-epoksydowe i szklano-epoksydowe, których wyniki badań porównano. Na wartość pochłaniania energii przeanalizowano wpływ takich czynników, jak: rodzaj włókien wzmacniających, rodzaj struktury, geometria i kształty próbek, orientacja włókien w warstwie i sekwencja układania warstw.
In the paper, experimental investigations of the energy absorption capability of carbonepoxy and glass-epoxy composites were described. Influence of the following factors on the energy absorption capability was analysed: fibre reinforcement type, kind of structure, geometry and shape of specimens, orientation of fibres in a layer, and stacking sequence of layers.
Źródło:: Biuletyn Wojskowej Akademii Technicznej; 2007, 56, 1; 143-158
1234-5865
Pojawia się w:: Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Experimental evaluation of energy absorbing properties of selected elastomer materials
Autorzy:: Stankiewicz, M.
Popławski, A.
Bogusz, P.
Gieleta, R.
Sławiński, G.
Powiązania:: https://bibliotekanauki.pl/articles/247562.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: material research
experiment
elastomers
polyurethanes
energy absorption properties
Opis:: The paper presents identifying studies of mechanical properties of the selected materials from the group of elastomers including Asmathane (65 ShA), Easyprene FPS (30 ShA), Biresin (U1305). The tests were carried out at the Laboratory of Strength of Materials, the Department of Mechanics and Applied Computer Science, with the use of an especially designed stand for testing the energy absorption of materials. The research aims were to determine the basic properties and characteristics of the selected materials as well as to compare them and identify the material with the best energy-absorbing characteristics. For a single load-unload cycle, applied dynamically, the hysteresis loops were recorded. Energy-absorption of individual materials and maximum strength were determined. During the experimental test, a fast speed camera was used for accurately register the progress performance of the test. The pictures of the dynamic tests of materials behaviour are shown. The curves of the tested materials are compared in the graphs. The resulting data will help to create constitutive models of the tested materials, which in the next stages of the project will be used in numerical studies on the impact of detonation on the designed protective panel.
Źródło:: Journal of KONES; 2015, 22, 3; 241-248
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: An energy absorption dynamic test of landing gear for 1400 kg general aviation aircraft
Autorzy:: Jakubowski, R.
Tywoniuk, A.
Powiązania:: https://bibliotekanauki.pl/articles/245048.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: landing gear
energy absorption
drop test
shock absorber
Opis:: Landing gear as one of the most crucial systems ensuring safe take-off and landing must be rigorously tested before first flight of each newborn aeroplane. In the static and dynamic tests strength, functionality and energy absorption capability of landing gear components (wheel, brake, shock absorber, support structure and retraction system) are verified. One of the most important is an energy absorption dynamic test. During drop, test campaign a landing gear damping system is not only verified but also optimized by changing parameters like: damping orifice diameter, geometry of gas and oil chambers and shock absorber and tire inflation pressures. This process often takes substantial amount of time because of influence of the mentioned parameters on landing gear energy absorption efficiency. Other factors like landing configuration spin up and spring back effects generated during wheel contact with the ground [1] also have to be considered in the energy absorption optimization process. The paper describes the landing gear drop test campaign and main challenges, which have to be overcome to achieve optimal dynamic characteristics of the system. The tested object was the main landing gear of the 1400 kg General Aviation aircraft certified in accordance with EASA CS-23 regulations. The drop test campaign was carried out in Warsaw Institute of Aviation Landing Gear Laboratory.
Źródło:: Journal of KONES; 2016, 23, 4; 159-165
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Dynamic studies of top-hat thin-walled elements joined by spot-welding
Autorzy:: Karliński, J.
Kopczyński, A.
Iluk, A.
Powiązania:: https://bibliotekanauki.pl/articles/246195.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: finite element method
energy absorption elements
crash tests
Opis:: The main subject of the work was numerical and experimental dynamic studies of top-hat thin-walled elements joined by spot welding. Spot weld diameter and pitch distance were the main parameters describing geometrical shape of examined elements as well as the material they were made of. The main purpose of the carried out investigations was to determine the spot weld pitch distance and diameter influence on thin-walled elements deformation as well as energy absorption capability. The results enabled determination of high-grade spot welds execution technology and fuli utilization of thin-walled elements energy absorption ability. The analysis of joining technique influence the longitudinal beam deformation manner as well as dynamic energy absorption was executed. Moreover the analysis of materials energy absorption application was carried out. High strength steels, the most often used in the automotive industry, were chosen for the energy absorption elements and load-carrying structure application. Realized experimental tests enabled the verification of elaborated top-hat profiles discrete models for various materials, spot weld diameters and pitch distances. The comparison analysis of the acquired experimental and numerical results was carried out. The obtained outcome may be utilized during the energy absorption elements design and the elaborated discrete models building methodology can be used in preliminary project works, where one has planned numerical simulations of load-carrying structures crash loadings.
Źródło:: Journal of KONES; 2010, 17, 1; 215-221
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Crush energy absorption capability of carbon-epoxy and glass-epoxy composites
Zdolność pochłaniania energii uderzenia elementów z kompozytów węgiel/epoksyd i szkło/epoksyd
Autorzy:: Ochelski, S.
Gotowicki, P.
Powiązania:: https://bibliotekanauki.pl/articles/241643.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: kompozyty polimerowe
energia absorpcji
badania doświadczalne
transport
włókna węglowe
polymer composites
absorption energy
experimental testing
carbon fiber
Opis:: In the paper, experimental investigation of the energy absorption capability of carbon-epoxy and glass-epoxy composites was described. Influence of the following factors on the energy absorption capability was analysed: fibre reinforcement type, kind of structure, geometry and shape of specimens, orientation of fibres in a layer and stacking sequence of layers. Specimens in a shape of tubes and truncated cones were selected for testing. The basic mechanical properties of composites designed for elements of energy absorbing structure, essential for numerical simulation of the failure mechanism during the crash test, were determined experimentally. The favourable effect of the failure initiator, made at the specimen's edge, causing the increase in the specific absorbed energy (SAE), as well as the influence of the thickness of individual layers of the layered composite on the SAE value were also investigated. In the tests for truncated cone specimens, the influences of the specimen's thickness on the SAE value were analysed.
W pracy opisano doświadczalne badania zdolności pochłaniania energii przez kompozyty węglowo-epoksydowe i szklano-epoksydowe, których porównano wyniki badań. Na wartość pochłaniania energii przeanalizowano wpływ, takich czynników jak: rodzaj włókien wzmacniających, rodzaj struktury, geometria i kształty próbek, orientacja włókien w warstwie i sekwencja układania warstw. Przyjęto do badań próbki w postaci rurek i ściętych stożków. Doświadczalnie określono podstawowe właściwości mechaniczne kompozytów, przeznaczonych na elementy konstrukcji energochłonnej, które są niezbędne do numerycznej symulacji mechanizmu niszczenia, występującego podczas badań zdolności pochłaniania energii w czasie uderzenia. Badano też korzystny wpływ inicjatora niszczenia, wykonanego na krawędzi próbki, który powoduje zwiększenie wartości względnej energii absorbowanej (WEA). Zbadano wpływ grubości poszczególnych warstw kompozytu warstwowego na wartość WEA. W badaniach próbek w postaci ściętych stożków, analizowano wpływ grubości ścianki i połówkowego kąta stożka na wartość WEA.
Źródło:: Journal of KONES; 2007, 14, 1; 289-302
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: On non-stationary energy absorption when interacting high-speed striker with textile armor materials
Autorzy:: Kharchenko, Ye.F.
Yermolenko, A.F.
Powiązania:: https://bibliotekanauki.pl/articles/237951.pdf
Data publikacji:: 2009
Wydawca:: Instytut Technologii Bezpieczeństwa Moratex
Tematy:: zbroja
materiały włókiennicze
pochłanianie energii
armor
textiles
energy absorption
Źródło:: Techniczne Wyroby Włókiennicze; 2009, R. 17, nr 2/3, 2/3; 73-77
1230-7491
Pojawia się w:: Techniczne Wyroby Włókiennicze
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Experimental and numerical investigation of energy absorption elastomer panel with honeycomb structure
Autorzy:: Bogusz, P.
Popławski, A.
Morka, A.
Stankiewicz, M.
Sławiński, G.
Powiązania:: https://bibliotekanauki.pl/articles/246847.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: energy absorption structure
blast shock wave
numerical modelling
elastomer
validation
Opis:: The paper presents a prototype design of elastomer energy absorbing panel made in a shape of honeycomb structure. The proposed panel was installed in a protected plate and tested on a specially designed test stand, where a shock wave from a small explosive charge was applied. The elastomer honeycomb structure was compared with a version of the panel made of solid elastomer materials, the same as used in the honeycomb structure and also with a protected plate without any panels. During the research, acceleration in the middle part of each investigated protected plate was recorded. The protected plates were scanned after the tests in order to measure their maximum deformation. Acceleration graphs and maximum deflections of all three considered structures were compared. The obtained results were used to validate numerical models of the designed structures and the test stand. A discreet model of the test stand and models of elastomer panels were developed with HyperMesh FEM software using shell and solid elements. The materials were described using a tabulated Johnson-Cook model and constitutive model for the rubber parts; all available in the material library of Ls-Dyna software. The blast loading was simulated using the CONWEP method. This model generates a boundary condition, based on the experimental data and TNT equivalent mass, which substitutes the wave propagation with a pressure. Finally, the experimental results of acceleration and deformation of the plates were compared with the corresponding results of the numerical analyses carried out using finite element method. The numerical models can be utilised in the future research as a virtual range stand. The developed elastomer honeycomb structure can be modified to meet various requirements of ballistic protection levels, by applying elastomer of different stiffness or optimizing shape and dimensions of the honeycomb structure.
Źródło:: Journal of KONES; 2015, 22, 4; 29-36
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: A finite element model development as a part of process of energy absorption material selection
Autorzy:: Jakubowski, R.
Skorupka, Z.
Powiązania:: https://bibliotekanauki.pl/articles/244612.pdf
Data publikacji:: 2016
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: RASTAS Spear
material
energy absorption
finite element model
LS-DYNA
Opis:: The Warsaw Institute of Aviation major role in the RASTAS Spear project was to design an energy absorption system for the space probe lander. As the system was meant to be unmanned, the main requirement was to use no active solutions like parachute or rocket propulsion (less complexity in application and thus more reliability). A group of various materials was chosen to be tested. Tests campaign was divided into three stages: static compression tests, low speed dynamic tests and high speed dynamic tests. The high-speed dynamic tests were divided into two substages. In the first one simple cube specimens were tested to obtain data necessary for second substage in which full-scale object was tested. Having valuable data from experiments, numerical simulations in LS-DYNA software were carried out and then the results were compared. Based on experimental data several iterations during finite element model developing process were made. That process allowed setting up properly simulation by changing and adjusting properties such: material models, contact types, element formulation and other important constants. The finite element simulation results showed a good correlation with experimental data. The knowledge gained from numerical model optimization in connection with experimental data allowed for creating faster and more accurate energy absorbing material selection methodology. This methodology was successfully used in subsequent projects in which Institute of Aviation took part and also can be used in other future applications.
Źródło:: Journal of KONES; 2016, 23, 3; 217-223
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: The energy cost versus energy absorption of single family houses - a case study of city of Jaslo
Autorzy:: Gryc, A.
Nawalany, G.
Sokolowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/61042.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:: energy cost
energy absorption
family house
Jaslo town
thermal insulation
heating system
Źródło:: Infrastruktura i Ekologia Terenów Wiejskich; 2015, IV/3
1732-5587
Pojawia się w:: Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Numerical simulation of energy absorption in polyurethane foams under impact
Autorzy:: Jankowski, M.
Czechowski, L.
Kotełko, M.
Powiązania:: https://bibliotekanauki.pl/articles/241823.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: polyurethane foams
energy absorption
lump mass method
finite element method
Opis:: Selection of proper mechanical characteristics of the padding material of the head rest, namely polyurethane foam, is particularly important in the design process of the vehicle seat head restraint. In the paper the code of numerical simulation of flexible polyurethane foam absorber response against impact of a rigid body (passenger's head) is presented. The code is based on the lump mass method. Basics of the numerical algorithm based on this method are presented. Material constitutive model of flexible polyurethane foam (FPF) derived on the basis of former experimental tests and used in the algorithm is described. Comparative results of numerical simulations together with results of experiments carried out on drop hammer rig with flat impact or are shown. The results are presented on diagrams of deceleration versus time. Also comparative Finite Element simulations are carried out. The FE simulation was performed using the implicit analysis, taking into account the multi-linear, hyper-elastic material model and large strain (non-linear geometric relations). The influence of damping coefficient on the deceleration characteristics was investigated. Some final conclusions concerning the applicability of the numerical code based on the lump mass method, as well as its advantages in comparison with the FE software are derived.
Źródło:: Journal of KONES; 2012, 19, 4; 245-252
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Experimental support for numerical simulations of energy absorbing structures
Autorzy:: Ochelski, S.
Gotowicki, P.
Powiązania:: https://bibliotekanauki.pl/articles/243303.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: polymer composites
energy absorbing structures
sandwich structures
specific energy absorption
experimental methods
Opis:: This paper presents experimental investigations of mechanical properties of materials used in the absorbing energy structures. Numerous experimental investigations are essential to develop a reliable numerical model of composite structures absorbing the impact energy. This model should correctly describe the dissipation of kinetic impact energy in the progressive crush process. Mechanical properties of composite materials like elastic modulus, strength, failure strains with influence of anisotropic properties are obtained experimentally. Different strength hypotheses are used for fibrous composites. The investigations on the complex stress state allow determining which of these theories describes the composite best. It was proved that both the matrix type and the structure of the composite have a very large influence on the SEA (Specific Energy Absorption), in particular on their crack propagation resistance. The dependence between the energy absorbed by a single energy absorbing element and a fragment of the structure absorbing the impact energy was discussed. Friction forces play the important role in the progressive crush of composites and they should be taken into account in developing a valid numerical model. Some authors state that the friction forces absorb 40% of the impact energy. The influence of failure strain rates on the absorbing energy capability, which is not clearly defined in the literature about composite structures, was also discussed.
Źródło:: Journal of KONES; 2008, 15, 1; 183-217
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Rdzenie konstrukcji kompozytowych z pianek półsztywnych do zastosowań w tarczach ochronnych dla strażaków
Cores of composite structures made of semi-rigid foams for use as protecting shields for firefighters
Autorzy:: Ryszkowska, J.
Leszczyńska, M.
Auguścik, M.
Bryśkiewicz, A.
Półka, M.
Kukfisz, B.
Wierzbicki, Ł.
Aleksandrowicz, J.
Szczepkowski, L.
Oliwa, R.
Powiązania:: https://bibliotekanauki.pl/articles/947473.pdf
Data publikacji:: 2018
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:: półsztywne pianki poliuretanowe
absorpcja energii
palność
semi-rigid polyurethane foams
energy absorption
flammability
Opis:: Przedmiotem badań były półsztywne pianki poliuretanowe zaliczane do grupy materiałów absorbujących energię, zastosowane do wytwarzania elementów konstrukcji tarcz ochronnych dla strażaków. W celu zwiększenia odporności pianek na działanie ognia modyfikowano je dodatkiem grafitu ekspandującego i Fyrol PNX. Otrzymano pianki trudnopalne, o zmniejszonej zapalności i ograniczonej ilości wydzielanego dymu, wykazujące zdolność do pochłaniania 12–19 % energii uderzenia. Wprowadzenie do wytwarzanej kompozycji piankowej odpadu gumowego pozwoliło na obniżenie ceny pianek o ok. 25 %.
The subject of the paper are semi-rigid polyurethane foams. They belong to a group of energy-absorbing materials, which have been used for manufacture of structural components of protecting shields for firefighters. In order to increase the fire resistance of the foams they were modified by addition of expandable graphite and Fyrol PNX. As a result, flame retardant foams have been obtained, with reduced flammability and limited amount of smoke emission, having an ability to absorb impact energy in the amount of 12–19 %. By introducing a rubber waste during the manufacture of foam composition, the price of foams was reduced by about 25 %.
Źródło:: Polimery; 2018, 63, 2; 125-133
0032-2725
Pojawia się w:: Polimery
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Impact behaviour of spot-welded thin-walled frusta
Autorzy:: Kotełko, M.
Mołdawa, A.
Powiązania:: https://bibliotekanauki.pl/articles/386785.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: thin-walled structures
frusta
impact
energy absorption
konstrukcja cienkościenna
absorpcja energii
zgrzewanie punktowe
Opis:: In the paper the dynamic response of thin-walled, spot-welded prismatic frusta subjected to axial impact load is investigated. The parametric study into the influence of several parameters on the energy absorption capability, expressed by some crashworthiness indicators is performed, using Finite Element simulations. FE model is validated by experimental results of quasi-static and dynamic (impact) tests. Results of initial study concerning influence of spot welds are presented. Some conclusions are derived from the parametric study into the influence of frustum angle and wall thickness upon the energy absorption capability.
Źródło:: Acta Mechanica et Automatica; 2016, 10, 4; 280-284
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Compressive Crush Performance of Square Tubes Filled with Spheres of Closed-Cell Aluminum Foams
Autorzy:: Uzun, A.
Powiązania:: https://bibliotekanauki.pl/articles/351799.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: spheres of closed-cell aluminium foam
foam-filled tubes
compression behavior
energy absorption
Opis:: This paper describes the compressive crush behaviour of spheres of closed-cell aluminium foams with different diameters (6, 8 and 10 mm) and square tubes filled with these spheres. The spheres of closed-cell aluminium foams are net spherical shape fabricated via powder metallurgy methods by heating foamable precursor materials in a mould. The square tubes were filled by pouring the spheres of closed-cell aluminium foams freely (without any bonding). The compressive crush performance of square tubes filled with spheres of closed-cell aluminum foams were compared to that of the empty tubes. The results show a significant influence of the spheres of closed-cell aluminium foam on the average crushing load of the square tubes. The energy absorption in the square tube filled with spheres of closed-cell aluminium foam with diameters of 10 mm is higher than in the other square tubes. The spheres of closed-cell aluminium foams led to improvement of the energy absorption capacity of empty tubes.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 3; 1755-1760
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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