Temat: laminates - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Experimental Determination of the Mode I Fracture Toughness in FRP Laminates with Hybrid Delamination Interfaces
Autorzy:: Rzeczkowski, Jakub
Samborski, Sylwester
Prokopek, Katarzyna
Tematy:: DCB test
hybrid laminates
fracture toughness
composite laminates; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/2204947.pdf Link otwiera się w nowym oknie
Opis:: This paper aims at experimental research of the effect of hybrid interface (carbon/glass fibers) on delamination resistance in unidirectional fiber reinforced polymer (FRP) composite laminates under the mode I opening load conditions. Three group of laminates exhibiting different combinations of reinforcing materials at delamination plane were tested. Critical strain energy release rates were determined by using the double cantilever beam (DCB) tests in accordance with the ASTM D5528 Standard. Values of the GIC were calculated by using classical data reduction schemes and they were compared with values obtained by using an alternative compliance based beam method (CBBM). For precise detection of delamination onset all tests were additionally supported by registration of the acoustic emission (AE) signal. Contribution of mixed-modes were evaluated by using numerical finite element analysis. Obtained outcomes revealed, that differences in the mode I c-SERR values obtained by using four different methods were insignificant. Moreover, the greatest value of the GIC was determined for laminates with hybrid interface and it was equal 0.24 N/mm.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Development and Assessment of Polymeric Laminate blended composites Reinforced with Bi-Woven Aramidic Fiber
Autorzy:: Amarababu, B.
Rangadu, V. P.
Tematy:: laminates
polymer blends
thermomechanical
chemical resistance; Pokaż więcej
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Powiązania:: https://bibliotekanauki.pl/articles/411638.pdf Link otwiera się w nowym oknie
Opis:: In the present paper evaluates laminated aramidic bi-woven fibers reinforced in polyester-vinylester blended composites. The Duo polymers, polyester-vinylester were blended using in situ polymerization technique. Four planar layers were made simultaneously and keeping one over another and each layer make sure to be weighed off 15% were maintained in all layers with different orientations. Pre-assumed Layer-1(50/50) 50 %, 0º; Layer-2(35/35/30) 35 % 0º, 35 % +45º, 30 %,0; Layer-3 (25/50/25) 25 % 0º, 50% +45º, 25-45º; Layer-4 (25/25/25/25) (2 5% 0º, 25 % +45º, 25 % -45º, 25 % 90º). Tthe composite was prepared with the help of hand layup technique. Test ready specimens were the help of shearing machine in accordance with ASTM. It was observed that, polyester and vinylester had good miscibility makes combined solid material. Flexural strength, tensile strength was improved up to 3ed layer, decreases after, whereas flexural modulus and tensile modulus were linearly increased up to 4th layer. Thermal stability and glass transition temperature were also found satisfactory for all the laminated layers. Chemical resistance was good for the entire chemical except toluene.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Postbuckling behaviour of laminated plates with a cut-out
Autorzy:: Falkowicz, K.
Dębski, H.
Tematy:: laminates
buckling
postbuckling
Finite Element Method; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/102047.pdf Link otwiera się w nowym oknie
Opis:: The subject of research is the numerical and experimental analysis of a thin-walled plate with the cut-out, made of the laminate and subjected to the axial compression. In order to ensure the stable plate work in the postcritical range, it need to force its work by higher flexural-torsional form of buckling. The scope of the research included nonlinear numerical analysis with Finite Element Method (FEM) and experimental verification of calculation results. For the composite material in numerical calculations, the model of orthotropic material in the flat state of tension was defined. For the mapping of the plate element coating finite elements of type SHELL was applied with a shape function of the second order to allow the mapping of the composite structure for the element thickness. The experimental research was carried out in a special grips providing the articulated support of the upper and lower edges of the plate. The deformation registration of compression structures were carried out with resistance extensometry. This allowed to define of postcritical equilibrium paths of real structure, showing the dependence of the force to displacement. The instrument used was a numerical program ABAQUS®.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Dobór materiałów inżynierskich na lekkie osłony energochłonne
Selection of engineering materials on light weight energy-intensive shields
Autorzy:: Szymiczek, M.
Tematy:: osłony balistyczne
laminaty
aramid
ballistic shields
laminates; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Inżynierii Materiałów Polimerowych i Barwników
Powiązania:: https://bibliotekanauki.pl/articles/278043.pdf Link otwiera się w nowym oknie
Opis:: Celem pracy było opracowanie kryteriów oraz algorytmu doboru materiałów inżynierskich na lekkie osłony energochłonne pracujące czasem bardzo zróżnicowanych warunkach środowiskowych. W wielu obszarach zarówno cywilnych jak i militarnych występuje potrzeba ochrony zdrowia i życia ludzi przed zagrożeniami wynikającymi z uderzenia skupionym odłamkiem lub falą uderzeniową. Podstawowym elementem konstrukcyjnym pozwalającym na odpowiednie zabezpieczenie są powłoki energochłonne, zapobiegające przenoszeniu się zagrożeń do strefy chronionej. Wykorzystanie w tym celu lekkich, mobilnych osłon warstwowych pozwala na minimalizację zagrożenia. Nieduża waga i łatwość montażu daje możliwość szybkiej naprawy, nawet w warunkach poligonowych. Osłony takie składają się z kilku warstw spełniających odpowiednie zadania, a mianowicie podkładu kompozytowego, warstwy adhezyjnej oraz paneli ceramicznych. Racjonalny dobór cech konstrukcyjnych takich powłok wymaga określenia warunków zachodzących w stanie zagrożenia oraz sformułowania kryteriów efektywności zabezpieczenia.
The aim of the work was to develop the criteria and the algorithm of selection of engineering materials to light energy-intensive shield which are sometimes supposed to work in very diverse environmental conditions. In many areas, both civilian as and military ones there is a need to protect human life and health against the risks resulting from the hitting of concentrated splinter or a blast wave. The basic constructional element allowing for an adequate protection are energy-intensive shields, which prevent the transmission of risks to the protected zone. The application of this light mobile layered shields allow to minimize risk. Lower weight and ease of installation enable fast repairs, even in military range conditions. These devices consist of several layers that perform the proper roles, namely a composite undercoat, adhesive layer and ceramic panels. Rational selection of the constructional characteristics of such shields requires the determination of the conditions occurring in a state of emergency and to formulate the criteria for the protection effectiveness.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Damage Detection and Size Quantification of FML with the Use of NDE
Autorzy:: Dragan, K.
Kornas, Ł.
Kosmatka, M.
Leski, A.
Sałaciński, M.
Synaszko, P.
Bieniaś, J.
Tematy:: fibre metal laminates
composites
non-destructive testing; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Powiązania:: https://bibliotekanauki.pl/articles/98012.pdf Link otwiera się w nowym oknie
Opis:: Composite materials have been developed in recent years. A new generation of structural composite materials for advanced aircraft is Fibre Metal Laminates (FML). They are hybrid composites consisting of alternating thin layers of metal sheets and fiber-reinforced composite material. FMLs have both low weight and good mechanical properties (high damage tolerance: fatigue and impact characteristics, corrosion and fire resistance). Quality control of materials and structures in aircraft is an important issue, also for Fibre Metal Laminates. For FML parts, a 100% non-destructive inspection for internal quality during the manufacturing process is required. In the case of FML composites, the most relevant defects that should be detected by non-destructive testing are porosity and delaminations. In this paper, a number of different non-destructive methods for the inspection of Fibre Metal Laminates were studied. The possibility of quality control of manufactured FML laminates - detection of defects as well as the procedures and processes are presented and discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Preliminary studies of riveted joints at feed force
Autorzy:: Bielawski, R.
Kowalik, M.
Rządkowski, W.
Pyrzanowski, P.
Tematy:: laminates
damage mechanics
mechanical testing
joints
joining; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/102917.pdf Link otwiera się w nowym oknie
Opis:: The aim of the study was to determine the feasibility of riveted joints in composites materials. Static tensile test method was used. In the test one type of glass fabric was used (Interglas 92140) from which two types of composite samples were prepared. In each sample the same type of fiber with the same fiber orientation – 3 layers - was used. The samples had dimensions of 100×100 mm and thickness of approximately 1 mm. The composite probes were located in a metal frame with a screw connection which was made of screws with nominal thread pitch M5. Screws were tightened with constant torque. It was to provide an axial force to the sample during the tensile test. The frame was placed between cross-bars of tensile machine INSTRON 8516. The samples were stretched at a speed of 0.05 mm/s at a distance up to 15 mm. During the tensile test displacement of the samples and pull force were registered. Depending on the fibre orientations and the value of feed force, damage models were described. On the basis of the results the possibility of usage of aluminium rivet nuts connections in composite materials was determined.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Evaluation of Force-Time Changes During Impact of Hybrid Laminates Made of Titanium and Fibrous Composite
Autorzy:: Jakubczak, P.
Surowska, B.
Bieniaś, J.
Tematy:: hybrid composites
titanium-carbon laminates
impact
damage; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/352329.pdf Link otwiera się w nowym oknie
Opis:: Fibre metal laminates (FML) are the modern hybrid materials with potential wide range of applications in aerospace technology due to their excellent mechanical properties (particularly fatigue strength, resistance to impacts) and also excellent corrosion resistance. The study describes the resistance to low velocity impacts in Ti/CFRP laminates. Tested laminates were produced in autoclave process. The laminates were characterized in terms of their response to impacts in specified energy range (5J, 10J, 20J). The tests were performed in accordance with ASTM D7137 standard. The laminates were subjected to impacts by means of hemispherical impactor with diameter of 12,7 mm. The following values have been determined: impact force vs. time, maximum force and the force at which the material destruction process commences (Pi). It has been found that fibre titanium laminates are characterized by high resistance to impacts. This feature is associated with elasto-plastic properties of metal and high rigidity of epoxy - fibre composite. It has been observed that Ti/CFRP laminates are characterized by more instable force during impact in stage of stabilization of impactor-laminate system and stage of force growth that glass fibre laminates. It has been observed more stable force decrease in stage of stress relaxation and withdrawal of the impactor. In energy range under test, the laminates based on titanium with glass and carbon fibres reinforcement demonstrate similar and high resistance to low-velocity impact, measured by means of failure initiation force and impact maximum force.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The Influence of Material Configuration of Fibre-Metal Laminates with Alumina Core on Flexural Strength
Autorzy:: Frankiewicz, Mariusz
Karoluk, Michał
Dziedzic, Robert
Timmel, Tristan
Scholz, Peter
Tematy:: fibre-metal laminates
flexural strength
fatigue
composite materials; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Powiązania:: https://bibliotekanauki.pl/articles/24201172.pdf Link otwiera się w nowym oknie
Opis:: Fibre metal laminates (FMLs) consisting of layers made of PA6 polyamide prepregs reinforced with glass and carbon fibres and an aluminium alloy core are the new variant of the other types used by aerospace FML materials such as GLARE or CARALL. By using a thermoplastic matrix, they can be shaped by stamping processes, which allows for a more efficient production process than classical laminating methods such as vacuum bagging. In addition to the improved impact energy absorption efficiency, the metallic core can be utilised to effectively bond the composite part to adjacent metallic structures. This article presents the influence of the material configuration of fibre-metal laminates consisting of continuous fibre-reinforced thermoplastic outer layers integrated with a layer of metallic aluminium alloy inserts - a number of layers, type and direction of reinforcing fibres - on the static and fatigue flexural properties. In this study, eight laminate configurations were prepared using a one-step variothermal consolidation process. The results showed that in the three-point flexural fatigue test, the samples exceeded 106 cycles at stresses <30% of the static bending strength. Laminates with predominantly longitudinally reinforced layers showed the highest fatigue strength among the FML samples analysed. The type of reinforcing fibres and the number of layers were less affected on the analysed mechanical properties.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Badanie reakcji osłon laminatowych na obciążenie falą podmuchową i odłamkami
Testing of laminated screen reaction against fragments and blast wave effect
Autorzy:: Trzciński, W.
Trębiński, R.
Cudziło, S.
Szudrowicz, M.
Tematy:: pancerze
laminaty
właściwości mechaniczne
armour
laminates
mechanical properties; Pokaż więcej
Wydawca:: Wojskowy Instytut Techniczny Uzbrojenia
Powiązania:: https://bibliotekanauki.pl/articles/235973.pdf Link otwiera się w nowym oknie
Opis:: W pracy zaproponowano metodykę badania reakcji osłon laminatowych na działanie fali podmuchowej oraz pocisku. Układ badawczy umożliwia obciążenie osłony impulsem ciśnienia oraz pociskiem o charakterystykach zbliżonych do obciążenia lekkiego pojazdu po wybuchu granatu. Do rejestracji procesu oddziaływania fali podmuchowej oraz przebijania osłony pociskiem zastosowano technikę rentgenografii impulsowej. Badano dwuwarstwowy układ blacha stalowa-płyta laminatowa. Dokonano analizy otrzymanych wyników doświadczalnych.
A two layered system of steel and laminated plate tested by the specialised set-up that provides equivalent conditions of an experiment to the effect of grenade blast against a light armoured vehicle is presented in the paper. The pulse X ray technology is used to register the behaviour of protecting screen subjected to blast and fragments effects.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: The Effect of Fiber Arrangement in the Bio-Laminate and Geometric Parameters on the Stability of Thin-Walled Angle Column Under Axial Compression
Autorzy:: Gawryluk, Jarosław
Tematy:: bio-laminates
flax
buckling analysis
L-profile
numerical case; Pokaż więcej
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Powiązania:: https://bibliotekanauki.pl/articles/2201861.pdf Link otwiera się w nowym oknie
Opis:: The aim of this study is to check how the change fiber configuration and geometric parameters affect the stability of a thin-walled angle column under compression. Buckling analysis of thin-walled structures made of bio-laminates was presented. Short angles with different configurations of reinforcing fibers and geometric parameters were studied. The laminate under analysis had a matrix made of epoxy resin reinforced with unidirectional flax fibers. The axially compressed structures were simply supported on both ends. Detailed numerical analyses were conducted by the finite element method using Abaqus software. The lowest two bifurcation loads and their corresponding eigenmodes were determined. Several configurations of unidirectional fiber arrangement with different width and length were tested. Results showed that the bio-laminate fiber configuration had a significant effect on the behavior of the compressed structure. Moreover, the change of geometrical parameters significantly influences the stability of the structure. In general, it was found that the bifurcation load decreased with the increase of the length of the L-profile column. However, increasing the flange width of the column resulted in a reduction of the bifurcation load (applies to a column with a length of 300 mm and longer). In paper the first stage of research is presented, which will be experimentally verified in subsequent studies.
Dostawca treści:: Biblioteka Nauki

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