Temat: mechanical joint - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: About mechanical joints design in metal - composite structure
Autorzy:: Puchała, K.
Szymczyk, E.
Jachimowicz, J.
Powiązania:: https://bibliotekanauki.pl/articles/246795.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: mechanical joint
adhesive joint
FEA
aviation
Opis:: Riveting is still one of the main joining methods of thin-walled aircraft structures. Such features as simplicity of implementation, possibility of two different material connection (e.g. metallic with non-metallic ones) and the fact that is it a well-known (reliable) method causes popularity of riveting. The never-ending attempt to obtain as low mass as possible (mainly to reduce fuel consumption) is the reason for using material of high specific strength in the aerospace industry. High strength titanium or aluminium alloys (e.g. 2024T3) and composite laminates (e.g. CFRP or Glare) are examples of such materials. The article deals with methods of connecting various materials. The paper presents advantages and disadvantages of different/selected connection types. Strength prediction and failure modes of mechanical joints are described for metallic as well as for composite components. Composites are complex materials having an anisotropic structure (and anisotropic mechanical properties) leading to various failure mechanisms. Main principles for appropriate joint design of composite laminate panels (laminate configuration and typical/specific geometrical dimensions) are indicated/specified. The bearing failure mechanism is accepted to be a safe progressive one. Mechanism of bearing (generally compressive) load transfer into composite laminates by shear of the matrix is analysed. Some examples of improvement bearing strength of laminates are presented according to literature. On the base of presented examples and bearing load transfer analysis, some conclusions for an appropriate solution of this problem are drawn.
Źródło:: Journal of KONES; 2012, 19, 3; 381-390
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Analysis of selected parameters influence on failure in metal-composite mechanical joint
Autorzy:: Puchała, K.
Powiązania:: https://bibliotekanauki.pl/articles/242244.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: mechanical joint
CRFP
aviation
FEM
Opis:: The never-ending attempt to obtain as low mass as possible is the reason for using material of high specific strength (stiffness) in the aerospace industry. High strength titanium or aluminium alloys (e.g. 2024T3) and composite laminates (e.g. CFRP or Glare) are the examples of such materials. Despite a large number of composite types, fibre reinforced composites in the form of laminates are commonly used in aircraft structures. One-half of modern aircrafts is made of composites. However, the second one is still made of metallic alloys. The usage of different materials in aircraft structures results in the necessity of joining composite and metallic components. There are three connection methods for aircraft primary structures: mechanical (riveting, bolting), adhesive (bonding) and hybrid where both mentioned methods are used. The paper deals with metal-composite mechanical joint. Although fibre reinforced composites have high tensile strength, the load transfer in mechanical joints of such components is limited. Strength of composite laminates is dependent on the joint geometry; however, it is strongly influenced by laminate lay-up. There are five global failure modes for mechanically fastened composite laminates: tension, bearing, shear-out, cleavage and pull-through. The bearing failure mechanism is a safe progressive mechanism not leading to catastrophic failure and therefore it is acceptable. Problems with strength assessment of composite mechanical joints are drawn. Some geometrical (joint width), material (bolt material, stacking sequence) as well as numerical parameters (failure criterion) are analysed.
Źródło:: Journal of KONES; 2014, 21, 1; 223-232
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 load transfer into composite structure
Autorzy:: Szymczyk, E.
Jachimowicz, J.
Puchała, K.
Powiązania:: https://bibliotekanauki.pl/articles/118025.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Promocji Wiedzy
Tematy:: mechanical joint
adhesive joint
composite material
load transfer
FEA
Opis:: The paper presents advantages and disadvantages of metal foils insertion between composite layers. Composites are complex materials of aniso-tropic structure leading to various failure mechanisms. Mechanism of compressive load transfer into composite laminates by shear of the matrix is analysed. The method of improvement compressive strength of laminates is presented according to literature and analysed for a sele-cted case. Simplified models of a laminate structure modified using various metal foils configurations are analysed with MSC.Marc code. Axial stress in prepreg layers and shear stress in adhesive layers are studied.
Źródło:: Applied Computer Science; 2014, 10, 3; 86-94
1895-3735
Pojawia się w:: Applied Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Mostki punktowe w obliczeniach cieplnych
Point bridges in thermal calculation
Autorzy:: Orlik-Kożdoń, B.
Szymanowska-Gwiżdż, A.
Steidl, T.
Krause, P.
Powiązania:: https://bibliotekanauki.pl/articles/362332.pdf
Data publikacji:: 2017
Wydawca:: Instytut Fizyki Budowli Katarzyna i Piotr Klemm
Tematy:: punktowy mostek termiczny
współczynnik przenikania ciepła
system ETICS
łącznik mechaniczny
point thermal bridge
heat transfer coefficient
ETICS system
mechanical joint
Opis:: W artykule przedstawiono zasady uwzględniania mostków punktowych w obliczeniach termicznych przegród. W ramach pracy przeanalizowano metodykę (dokładną, uproszczoną) uwzględniania mostków przestrzennych w obliczeniach termicznych. Na przykładach, zamodelowano różne typy łączników mechanicznych w systemach ETICS. Dla wybranych modeli łącznika wyznaczono punktowy współczynnik przenikania ciepła oraz określono jak jego obecność kompensowana jest przez dobór odpowiedniej grubości izolacji.
The article presents ways of taking into account point bridges in partitions thermal calculations. As shown later in this work, the methodology (both accurate and simplified) of including spatial bridges in thermal calculations has been analysed. Different types of mechanical anchors were modelled in the ETICS system. For selected models of the anchor, the point thermal transmittance value was established. In addition, it was determined how its presence is compensated owing to the use of a suitable layer of insulation (its thickness).
Źródło:: Fizyka Budowli w Teorii i Praktyce; 2017, T. 9, nr 1, 1; 25-32
1734-4891
Pojawia się w:: Fizyka Budowli w Teorii i Praktyce
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Effects of geometrical and dimensional errors on kinematics and dynamics of Tracta coupling
Wpływ błędów geometrycznych i wymiarowych na kinematykę i dynamikę przegubu równobieżnego typu Tracta
Autorzy:: Valentini, P. P.
Pezzuti, E.
Powiązania:: https://bibliotekanauki.pl/articles/280958.pdf
Data publikacji:: 2011
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: Tracta joint
tolerance
mechanical error
multibody model
Opis:: The paper deals with the investigation of the influence of geometrical and dimensional errors on performance of the Tracta coupling. It is one of the most simple constant-velocity joints which has been used in front-wheel drive automobiles, all-wheel drive military vehicles, heavy vehicles and various other applications. The proposed study is based on building and simulating a parametric spatial multibody model of the full joint. Both kinematic and dynamic behaviour have been investigated. Five different linear and angular errors have been studied. The sensitivity of kinematics and dynamics irregularities to these errors has been computed and summarized in design charts. The results can be used in optimal tolerance allocation and accurate vehicle system simulation with the coupling joint sub-model.
W pracy przedstawiono badania wpływu błędów geometrycznych i wymiarowych na pracę przegubu typu Tracta. To jedno z najprostszych rozwiązań konstrukcyjnych przegubu równobieżnego, który szeroko stosowany jest w przednich osiach napędowych samochodów osobowych, pojazdach wojskowych z napędem na wszystkie osie, ciężkich pojazdach i wielu innych maszynach. Przedstawione badania oparto na symulacjach wielobryłowego i przestrzennego modelu przegubu. Przeanalizowano właściwości kinematyczne i dynamiczne modelu uwzględniającego pięć różnych błędów geometrycznych odnoszących się do wymiarów liniowych i kątowych. Wrażliwość modelu na błędy opisano za pomocą charakterystyk kinematycznych i dynamicznych układu w funkcji wielkości tych odchyłek. Otrzymane wykresy mogą stanowić podstawę do optymalizacji obszaru tolerancji w projektowaniu przegubu Tracta oraz być pomocne przy właściwej symulacji zachowania się pojazdów wyposażonych w takie przeguby i opisanych modelem omówionym w pracy.
Źródło:: Journal of Theoretical and Applied Mechanics; 2011, 49, 1; 117-133
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Microstructure and Mechanical Properties of Welded Jointsof Thor 115 Steel
Autorzy:: Golański, G.
Merda, A.
Klimaszewska, E.
Urzynicok, M.
Słania, J.
Powiązania:: https://bibliotekanauki.pl/articles/353310.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Thor 115 steel
weld joint
microstructure
mechanical properties
Opis:: Research was conducted on welded joints of martensitic steel Thor 115 made with two filler materials – CrMo91 and Ni 6082. The scope of the investigations included: non-destructive and destructive testing. The macro- and microstructural investigations revealed correct structure of the weld, without welding imperfections. In the joint welded with Ni 6082, the so-called Nernst’s layers and δ-ferrite grains were visible. The investigations of the analysed joints showed that their properties, i.e. tensile strength and impact strength, were higher than the required minimum, whereas hardness was lower than the maximum value of 350 HV permitted for this group.
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 2; 743-748
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Correlations of Mechanical Properties and Microstructure at Specific Zones of Welded Joint of High-Strength Low-Alloy Steels
Autorzy:: Ivanović, L.
Marjanović, V.
Ilić, A.
Stojanović, B.
Lazić, V.
Powiązania:: https://bibliotekanauki.pl/articles/354032.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: high-strength low-alloy steel
welded joint
mechanical properties
microstructure
Opis:: This paper presents experimental testing of the mechanical characteristics and properties of samples made of high-strength low-alloy steel with two different multi pass V grove butt welded joint. Two sample groups are tested: the root pass is made by manual metal arc welding process for the former and metal inert gas welding process for the latter. Other passes of those multi passes welded joints are made by metal active gas welding process. Further, the research included analyses of the experimentally obtained mechanical properties and load response of the samples in correlations to microhardness distribution and microstructural state at specific zones of the welded joints. Since both the chemical composition and microstructural state of high-strength low-alloy steel originate from special production processes their nature must be fully understood. Accordingly, the nature of the steels should directly impact not only the selection and definition of welding but the design process of mechanical constructions, too. From the practical aspect, mechanical characteristics and properties as well as load response of welded joints are crucial. But, sensitivity of those steels to inadequate welding technology and improper parameters or filler metal is high. On the other side, design codes and recommendations are not yet fully developed and precise. Results obtained in this research implicate that even small changes of welding technology causes the change of characteristics itself. Consequently, the steels development must be accompanied with the improvement of the welding processes and design modifications.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 1; 285-292
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Thermal Mechanical Stress Analysis of Ladle Lining with Integral Brick Joint
Autorzy:: Chang, W.
Li, G.
Kong, J.
Sun, Y.
Jiang, G.
Liu, H.
Powiązania:: https://bibliotekanauki.pl/articles/354915.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ladle
heat transfer model
lining
expansion joint
thermal mechanical stress
Opis:: Based on the theory of heat transfer, the influence of expansion joints on the temperature and stress distribution of ladle lining is discussed. In view of the current expansion joint, the mathematical model of heat transfer and the three dimensional finite element model of ladle lining brick are established. By analyzing the temperature and stress distribution of ladle lining brick when the expansion joints are in different sizes, the thermal mechanical stress caused by the severe temperature difference can be reduced by the suitable expansion joint of the lining brick during the ladle baking and working process. The analysis results showed that the thermal mechanical stress which is caused by thermal expansion can be released through the 2 mm expansion joint, which is set in the building process. So we can effectively reduce the thermal mechanical stress of the ladle lining, and there is no risk of steel leakage, thus the service life of ladle can be effectively prolonged.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 2; 659-666
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Thermal Fatigue Damage and Residual Mechanical Properties of WCu45/FeCr18Ni9 Steel Brazed Joint with NiCrSiBFe Filler Metal
Autorzy:: Xia, Chunzhi
Fu, Linling
Du, Wenchao
Xu, Xiangping
Wang, Xiling
Zou, Jiasheng
Powiązania:: https://bibliotekanauki.pl/articles/2049429.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Ni-based brazed joint
thermal fatigue damage
residual mechanical properties
fracture morphology
Opis:: Thermal fatigue properties of WCu45/ FeCr18Ni9 steel brazed joint with Ni-Cr-Si-B filler metal were investigated. Results indicated that the fatigue damage of Ni-based joint was aggravated with the increased of thermal fatigue cycles times. Moreover, the fatigue cracks appeared in the brazing seam and FeCr18Ni9 steel side near the brazing seam, and the bending strength of the brazed joint decreased from 333 MPa of original joint to 160 MPa of having experienced 200 thermal fatigue cycles. The fracture characteristic of Ni-based joint underwent 200 cycles was identified as mixed ductile-brittle fracture under the combined effect of external bending load and internal fatigue damage.
Źródło:: Archives of Metallurgy and Materials; 2021, 66, 1; 197-203
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Damage Analysis of the Blade to the Rotor Hub Connection in the Wind Turbine
Autorzy:: Gremza, G.
Zamorowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/104789.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:: undersized bolts
mechanical properties
bolts
wind turbine
blade failures
model of joint
Opis:: The paper analyzes possible causes of bolts fracture in the connection of the blade to the hub of the wind turbine rotor. This failure has been growth shortly after the wind turbine was started, a few days after the storm. During the storm, electric power was turned off in the whole surrounding area for many hours, therefore it was impossible to control the device. After an initial analysis of failure modes in other wind turbines, it was found, that the bolts failure in the analysed case may be regarded as quite rare. Due to the fact that a significant part of bolts was broken brittle (flat fracture surfaces and lack of permanent elongation), it was decided to analyse the structure of the material in the direction of stress corrosion and hydrogen embrittlement. Among others, microscope analysis of fracture surfaces after their proper cleaning from corrosion products was carried out. The broken bolts were made as undersized, what is mainly used in fasteners intended for hot-dip galvanizing. On the basis of the purchase documentation analysis, it was presumed that the bolts were not galvanized by their manufacturer, which is obliged to perform the routine inspection in production process preventing the introduction of the hydrogenated bolts into the market. Besides the bolts examination, the scenarios of connection loads in extreme situations, in particular the impact of wind with high energy in the most unfavourable direction relative to the blade and nacelle, as well as the force resulting from the impact of the rotating blade on the tower that preceded the collapse of the whole structure, were considered. Conclusions from the performed tests and calculations by use of two calculation models of the connection were presented.
Źródło:: Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 2; 55-67
2300-5130
2300-8903
Pojawia się w:: Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:: Biblioteka Nauki

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