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Wyświetlanie 1-15 z 247
Tytuł:
Vibrations of periodic sandwich plates with inert core
Autorzy:
Marczak, J.
Jędrysiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/128072.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
periodic sandwich plates
inert core
tolerance averaging
free vibrations
microstructure effect
płyty warstwowe
tolerancyjne uśrednianie
drgania własne
drgania swobodne
efekt mikrostruktury
Opis:
In this note a free vibration analysis of periodic three-layered sandwich structures is performed. The equations of motion of such structures, which are derived basing on Kirchhoff's thin plate theory, contain periodic, non-continuous and highly oscillating coefficients, which makes them difficult to solve. In this work, the tolerance averaging technique is applied in order to transform the mentioned system of equations into a form with constant coefficients, which takes into account the effect of the microstructure size. The differences between two modelling procedures are shown and discussed. Eventually, formulas for free vibration frequencies of an exemplary 2D structure are derived and an analysis of influence of certain varying material properties is performed.
Źródło:
Vibrations in Physical Systems; 2016, 27; 265-272
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tolerance modelling of nonstationary problems of microheterogeneous media and structures
Autorzy:
Jędrysiak, J.
Domagalski, Ł.
Marczak, J.
Pazera, E.
Powiązania:
https://bibliotekanauki.pl/articles/128176.pdf
Data publikacji:
2018
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
microheterogeneous media
microheterogeneous structure
tolerance modelling
non-stationary problems
nonlinear vibrations
microstructure effect
ośrodki mikroheterogeniczne
struktury mikroheterogeniczne
modelowanie tolerancyjne
problemy niestacjonarne
drgania nieliniowe
efekt mikrostruktury
Opis:
In this note a certain review of applications of a non-asymptotic modelling approach, called the tolerance modelling, is presented. Some objects and thermomechanical problems are shown, with a general outline of this method and an example of application for nonlinear vibrations of periodic beams.
Źródło:
Vibrations in Physical Systems; 2018, 29; 1-23
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Microstructure on Mechanical Properties of BA1055 Bronze Castings
Autorzy:
Łabanowski, J.
Olkowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/379597.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ship propeller castings
bronze casting
mechanical properties
metallography
śruby okrętowe
odlewy z brązu
właściwości mechaniczne
metalografia
Opis:
The article presents research results performed on aluminum bronze CuAl10Fe5Ni5 (BA1055) castings used for marine propellers. Metallographic studies were made on light microscope and a scanning electron microscope to assess quantitatively and qualitatively the alloy microstructure. It has been shown that the shape, size and distribution of the iron-rich κ−phase precipitates in bronze microstructure significantly affect its mechanical properties. With an increase in the number of small κ−phase precipitates increases the tensile strength of castings, while the presence of large globular precipitates improves ductility. Fragmentation and shape of κ−phase precipitates depends on many factors, particularly on the chemical composition of the alloy, Fe/Ni ratio, cooling rate and casting technology.
Źródło:
Archives of Foundry Engineering; 2014, 14, 2; 73-78
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Microstructure of Fe-C-V Alloys on Selected Functional Properties
Autorzy:
Kawalec, M.
Kozana, J.
Powiązania:
https://bibliotekanauki.pl/articles/382066.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microstructure
Fe-C-V alloy
workability
mechanical properties
vanadium carbide
mikrostruktura
stop Fe-C-V
urabialność
właściwości mechaniczne
węglik wanadu
Opis:
The cast alloys crystallizing in Fe-C-V system are classified as white cast iron, because all the carbon is bound in vanadium carbides. High vanadium cast iron has a very high abrasion resistance due to hard VC vanadium carbides. However, as opposed to ordinary white cast iron, this material can be treated using conventional machining tools. This article contains the results of the group of Fe-C-V alloys of various microstructure which are been tested metallographic, mechanical using an INSTRON machine and machinability with the method of drilling. The study shows that controlling the proper chemical composition can influence on the type and shape of the crystallized matrix and vanadium carbides. This makes it possible to obtain a high-vanadium cast iron with very high wear resistance while maintaining a good workability.
Źródło:
Archives of Foundry Engineering; 2014, 14, 3; 33-36
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of microstructure on mechanical properties and corrosion resistance of 2205 duplex stainless steel
Autorzy:
Łabanowski, J.
Świerczyńska, A.
Topolska, S.
Powiązania:
https://bibliotekanauki.pl/articles/258492.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
duplex stainless steel
stress corrosion cracking
microstructure
ageing
Opis:
This paper presents results of the research on impact of microstructure of austenitic-ferritic steel of duplex type on its mechanical properties and susceptibility to stress corrosion cracking. As showed, improper processing technologies more and more often used in shipbuilding industry for plates and other half-finished products made of duplex steel may cause significant lowering their properties, which frequently makes their replacing necessary. Results of the tests on stress corrosion under tension with low strain rate (SSRT) conducted in an inert and corrosion (boiling magnesium chloride) environment , are presented. It was proved that even minor structural transformations taking place in 500ºC ageing temperature lower corrosion resistance of the steel. Structural transformations occurring in 700ºC temperature to a smaller extent influence susceptibility to stress corrosion of the steel, however they cause drastic drop in its plasticity.
Źródło:
Polish Maritime Research; 2014, 4; 108-112
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cast High-Manganese Steel – the Effect of Microstructure on Abrasive Wear Behaviour in Miller Test
Autorzy:
Kalandyk, B.
Tęcza, G.
Zapała, R.
Sobula, S.
Powiązania:
https://bibliotekanauki.pl/articles/383241.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
austenite
high-manganese steel
microstructure
abrasive wear resistance
Miller slurry machine test
austenit
stal wysokomanganowa
mikrostruktura
odporność na ścieranie
test Millera
Opis:
The results of the modification of austenitic matrix in cast high-manganese steel containing 11÷19% Mn with additions of Cr, Ni and Ti were discussed. The introduction of carbide-forming alloying elements to this cast steel leads to the formation in matrix of stable complex carbide phases, which effectively increase the abrasive wear resistance in a mixture of SiC and water. The starting material used in tests was a cast Hadfield steel containing 11% Mn and 1.34% C. The results presented in the article show significant improvement in abrasive wear resistance and hardness owing to the structure modification with additions of Cr and Ti.
Źródło:
Archives of Foundry Engineering; 2015, 15, 2; 35-38
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geometrically nonlinear vibrations of thin visco-elastic periodic plates on a foundation with damping: non-asymptotic modelling
Autorzy:
Jędrysiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/280289.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
thin visco-elastic periodic plates
nonlinear vibrations
effect of microstructure size
analytical tolerance modelling
Opis:
The objects under consideration are thin visco-elastic periodic plates with moderately large deflections. Geometrically nonlinear vibrations of these plates are investigated. In order to take into account the effect of microstructure size on behaviour of these plates a non- -asymptotic modelling method is proposed. Using this method, called the tolerance modelling, model equations with constant coefficients involving terms dependent on the microstructure size can be derived. In this paper, only theoretical considerations of the problem of nonlinear vibrations of thin visco-elastic periodic plates resting on a foundation with damping are presented.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 945-961
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Microstructure on the Corrosion Resistance of the AE42 Magnesium Alloy Processed by Rotary Swaging
Autorzy:
Minárik, P.
Zemková, M.
Král, R.
Mhaede, M.
Wagner, L.
Hadzima, B.
Powiązania:
https://bibliotekanauki.pl/articles/1402163.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
82.45.Bb
Opis:
Microstructure and corrosion resistance of the AE42 commercial alloy processed by extrusion and rotary swaging were investigated. Microstructure characterization showed an increasing volume fraction of the refined grains with increasing stage of swaging processing. However, their presence was limited solely to the peripheral ring of ≈1 mm in all studied conditions of swaged material. Corrosion resistance investigation showed continuous decrease of polarization resistance that was attributed to the grain refinement and insufficient homogenization of the alloying elements during the swaging process.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 805-807
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Microstructure and Mechanical Properties of Al 3003 Alloy Weld by Stationary Shoulder Friction Stir Welding Process
Autorzy:
Jung, Woo-Chul
Park, Joo-Heon
Yoon, Sang-Min
Kim, Young Kyun
Powiązania:
https://bibliotekanauki.pl/articles/2203728.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
stationary shoulder friction stir welding
aluminum 3003 alloy
microstructure
mechanical properties
Opis:
The lap joint welding of Al 3003 alloy by stationary shoulder friction stir welding (SSFSW) was performed under the conditions of tool rotation and welding speed, and it was confirmed that the welding was performed under all conditions. The tunnel defects and pores were formed in the weld zone at the lowest tool rotation and welding speed, and it is increased, the weld surface has been improved. At the same tool rotation speed at the welding speed is increased, the grain size was refined in the stir zone (SZ) and thus the hardness increased by about 14% compared to the base metal. The tensile shear strength is measured to be 10 kN or more under most conditions, and in the 4000 rpm with high heat input, the shear tensile strength was measured relatively lower than other conditions due to excessive heat input of the material.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 113--118
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vibrations of microstructured beams with axial force
Autorzy:
Jędrysiak, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/2146554.pdf
Data publikacji:
2020
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
microstructured periodic beams
slender beams
effect of microstructure
tolerance modelling
belka o strukturze periodycznej
belka smukła
efekt mikrostruktury
modelowanie tolerancyjne
Opis:
In this contribution there are considered vibrations of microstructured periodic slender beams, with axial force. In order to analyse the effect of the microstructure size of the beams on their vibrations the tolerance modelling method is applied. Using this method there are derived governing equations of two tolerance models - general and standard, base on two various concepts - weakly-slowly-varying functions and slowly-varying functions. These models are applied to obtain formulas of lower order and higher order frequencies with influence of the axial force. To evaluate these results of the modelling the formula of lower order frequencies in the framework of the asymptotic model (neglecting the effect of the microstructure size) is also derived.
Źródło:
Vibrations in Physical Systems; 2020, 31, 2; art. no. 2020208
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Annealing effect on microstructure and chemical composition of Inconel 625 alloy
Wpływ wyżarzania na mikrostrukturę i skład chemiczny stopu Inconel 625
Autorzy:
Petrzak, P.
Kowalski, K.
Rozmus-Górnikowska, M.
Dębowska, A.
Jędrusik, M.
Koclęga, D.
Powiązania:
https://bibliotekanauki.pl/articles/264128.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Inconel 625
microsegregation
annealing
mikrosegregacja
wyżarzanie
Opis:
Our research focused on Inconel 625 weld overlays on 16Mo3 steel boiler pipes. The investigation focused on the characterization of changes in the microstructure and chemical composition after annealing. The annealing was performed for ten hours at temperatures from 600 to 1000°C. Changes in the microstructure were observed with a scanning and transmission electron microscope (SEM and TEM). The investigation was supplemented by hardness measurements.
Badania przeprowadzono na napoinach ze stopu Inconel 625 na stali kotłowej 16Mo3. Skoncentrowano się na charakterystyce mikrostruktury i składu chemicznego zmian po wyżarzaniu. Obróbkę cieplną przeprowadzono w temperaturze od 600 do 1000°C przez 10 godzin. Zmiany mikrostruktury obserwowano przy użyciu skaningowej i transmisyjnej mikroskopii elektronowej (SEM i TEM). Badania zostały uzupełnione o pomiary twardości.
Źródło:
Metallurgy and Foundry Engineering; 2018, 44, 2; 73-80
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of the oxygen, nitrogen and hydrogen content in ductile iron castings and their effect on microstructure and mechanical properties
Autorzy:
Kamińska, J.
Basińska, E.
Stefański, Z.
Angrecki, M.
Powiązania:
https://bibliotekanauki.pl/articles/391558.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
ductile iron
oxygen/nitrogen/hydrogen content
methods of spheroidizing treatment
reaction chamber (reactor)
Opis:
Two different spheroidization methods were compared in terms of the effect they may have on gas content (oxygen, nitrogen and hydrogen) in ductile iron castings and process efficiency. Two methods of cast iron treatment were investigated, i.e. spheroidization in the foundry mould using a reaction chamber (reactor) developed by the Foundry Research Institute and, as a reference, the method currently used by foundry shops, i.e. spheroidization in the foundry ladle. The effect of spheroidization process was evaluated on test castings. The results of metallographic examinations and mechanical tests as well as the results of measurements of the oxygen, nitrogen and hydrogen content in cast iron after spheroidizing treatment were presented.
Źródło:
Prace Instytutu Odlewnictwa; 2017, 57, 4; 357-361
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Higher order vibrations of thin periodic plate bands with various boundary conditions
Autorzy:
Jędrysiak, J.
Wyrwa, P.
Powiązania:
https://bibliotekanauki.pl/articles/127710.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
periodic plates
effect of microstructure size
higher order vibrations
tolerance modelling
płyty periodyczne
rozmiar mikrostruktury
drgania wyższego rzędu
modelowanie tolerancyjne
Opis:
In this contribution there are considered thin periodic plates. The tolerance averaging method, cf. [12, 13, 4], is applied to model problems of vibrations of these plates. Hence, the effect of the microstructure size is taken into account in model equations of the tolerance model. Calculations are made for periodic plate bands using this model and the asymptotic model for various boundary conditions.
Źródło:
Vibrations in Physical Systems; 2016, 27; 181-186
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Microstructure and Unit Cell’s Geometry on the Compressive Mechanical Response of Additively Manufactured Co-Cr-Mo Sheet I-WP Lattice
Autorzy:
Park, So-Yeon
Kim, Kyu-Sik
AlMangour, Bandar
Lee, Kee-Ahn
Powiązania:
https://bibliotekanauki.pl/articles/2174564.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser powder bed fusion
Co-Cr-Mo
sheet I-WP lattice
compressive mechanical response
strain-induced martensitic transformation
Opis:
Co-Cr-Mo based sheet I-WP lattice was fabricated via laser powder bed fusion. The effect of microstructure and the I-WP shape on compressive mechanical response was investigated. Results of compression test showed that yield strength of the sheet I-WP was 176.3 MPa and that of bulk Co-Cr-Mo (reference material) was 810.4 MPa. By applying Gibson-Ashby analytical model, the yield strength of the lattice was reversely estimated from that of the bulk specimen. The calculated strength of the lattice obtained was 150.7 MPa. The shape of deformed lattice showed collective failure mode, and its microstructure showed that strain-induced martensitic transformation occurred in the overall lattice. The deformation behavior of additively manufactured sheet I-WP lattice was also discussed.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 4; 1525--1529
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Modifier on the Microstructure of the AlSi10CuNiMn Alloy
Autorzy:
Cais, Jaromir
Heinrich, Jiri
Jirounkova, Klara
Powiązania:
https://bibliotekanauki.pl/articles/103309.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
Al-Si alloy
microstructure
modification
microscopy
stop Al-Si
mikrostruktura
modyfikacja
mikroskopia
Opis:
This paper deals with different types of modifiers and their effect on the microstructure of the Al-Si alloy. For the purposes of this research, strontium, antimony and calcium were used as the modifiers of the AlSi10CuNiMn alloy. Unmodified alloy was cast in order to be compared with the alloy modified by different modifiers in various concentrations. The results of this research were analysed via light and electron microscopy.
Źródło:
Advances in Science and Technology. Research Journal; 2020, 14, 2; 13-18
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 247

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