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Wyświetlanie 1-15 z 41
Tytuł:
Measurement of Molding Sand Elasticity
Autorzy:
Major-Gabryś, K.
Grabarczyk, A.
Dobosz, S.M.
Jakubski, J.
Morek, J.
Beňo, J.
Powiązania:
https://bibliotekanauki.pl/articles/106977.pdf
Data publikacji:
2018
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
molding sands
mechanical deformation
elasticity
hot-distortion
Opis:
The progressive mechanization and automation of industrial equipment is the driving force of progress, not only in the field of production but also in the measuring and control equipment. In mold production, the automation of processes such as forming molds and cores along with their assembly has led to increases in serial production, reductions in defects, and the shortening of molding times, among others. Thanks to automation in mold and core departments and the use of all sorts of manipulators, mold production in foundries has gained momentum. Unfortunately, in addition to the mentioned advantages, there are also new challenges as to the quality and properties of the molding and core sands used in highly automated foundries.This article presents recent research on molding sand elasticity. The topic was introduced as an attempt to answer the new needs of highly mechanized foundries. The article discusses a new method of measuring the resistance of molding materials to undergoing mechanical deformation (molding sand elasticity), with an additional analysis of the bending strengths of the tested samples. Precise measurements, test sample preparation, and interpretation of the received results are presented in the article.
Źródło:
Journal of Casting & Materials Engineering; 2018, 2, 2; 38-44
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Moulding Sand Type on Mechanical and Thermal Deformation
Autorzy:
Grabarczyk, A.
Major-Gabryś, K.
Dobosz, S. M.
Jakubski, J.
Bolibruchová, D.
Brůna, M.
Pastirčák, R.
Powiązania:
https://bibliotekanauki.pl/articles/353843.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
foundry engineering
moulding sand
core sand
organic binder
inorganic binder
mechanical deformation
thermal deformation
Opis:
Casting industry has been enriched with the processes of mechanization and automation in production. They offer both better working standards, faster and more accurate production, but also have begun to generate new opportunities for new foundry defects. This work discusses the disadvantages of processes that can occur, to a limited extend, in the technologies associated with mould assembly and during the initial stages of pouring. These defects will be described in detail in the further part of the paper and are mainly related to the quality of foundry cores, therefore the discussion of these issues will mainly concern core moulding sands. Four different types of moulding mixtures were used in the research, representing the most popular chemically bonded moulding sands used in foundry practise. The main focus of this article is the analysis of the influence of the binder type on mechanical and thermal deformation in moulding sands.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 347-351
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite element analysis of mechanical stress in in-wheel motor
Autorzy:
Xu, Jie
Powiązania:
https://bibliotekanauki.pl/articles/2086692.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
deformation
in-wheel motor
mechanical loads
mechanical stress
Opis:
When the in-wheel motor is working, it will be affected by gravity, centrifugal force and electromagnetic force. These three kinds of mechanical loads will affect the mechanical stress characteristics of the in-wheel motor, and then affect the reliability of the in-wheel motor structure. In order to understand the influence of the above loads on the mechanical stress of the in-wheel motor, this paper takes a 15-kW built-in permanent magnet in-wheel motor as the research object. Based on the establishment of the electromagnetic field and structure field coupling analysis model of the in-wheel motor, the mechanical stress of the in-wheel motor under different mechanical loads under rated and peak conditions are calculated and analyzed, and the influence of different mechanical loads on the stress and deformation of the in-wheel motor are studied. The research results show that, regardless of the rated operating condition or the peak operating condition, the in-wheel motor has the largest mechanical stress and deformation under the combined action of centrifugal force and electromagnetic force, and the smallest mechanical stress and deformation under the action of gravity only; under the same load (except for the case of gravity only), the stress and deformation of the in-wheel motor under the peak operating condition are larger than those under the rated operating condition; and the maximum stress and deformation of the in-wheel motor appear at the rotor magnetic bridge and the inner edge of the rotor, respectively, so the rotor is an easily damaged part of the in-wheel motor.
Źródło:
Archives of Electrical Engineering; 2022, 71, 2; 455--469
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal-mechanical coupled simulation
Autorzy:
Nguyen, H. P.
Derewońko, A.
Niezgoda, T.
Powiązania:
https://bibliotekanauki.pl/articles/244229.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
thermo-mechanical coupled
simulation
plastic deformation
Opis:
Optimal design of engineering structures and technological processes requires taking into account various factors affecting the state of strain and stresses in the structure. Coupled thermo-mechanical analysis enables, among others, determination of undesirable changes in a body shape resulting from the implementation method of the initially-boundary conditions, for example, time-varying load and physical properties of the material depending on the temperature. They are also used to determine residual stresses remaining after manufacturing to prevent revalued stiffness and rigidity of the designed construction. In this study, coupled thermo-mechanical analysis illustrated by metal machining operation is presented. The commercial code MSC.Marc has been used to develop a coupled thermo-mechanical finite element model of plane-stress orthogonal metal cutting operations. Metal cutting is one of the most important and common manufacturing processes in the car industry. A thermal mechanical transient analysis is performed to convert mechanical work into heat by plastic deformation of the workpiece material and friction during metal machining operation. The finite element mesh distortion, due to large deformations, requires a remesh technique. The influence of parameters of the 2D and 3D finite element mesh adaptation on plastic deformation and temperature generated in the cutting processing is considered.
Źródło:
Journal of KONES; 2015, 22, 3; 161-168
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and properties of nanomaterials produced by severe plastic deformation
Autorzy:
Pakieła, Z.
Garbacz, H.
Lewandowska, M.
Drużycka-Wiencek, A.
Suś-Ryszkowska, M.
Zieliński, W.
Kurzydłowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/146207.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
nanocrystalline metals
severe plastic deformation
mechanical properties
Opis:
In recent years, a number of methods for refining the structure of metals by severe plastic deformation (SPD) have been developed. Some of those methods permit grain refinement to a nanometric level. These methods include, among others, high pressure torsion (HPT), equal channel angular pressing (ECAP) and hydrostatic extrusion (HE). The aim of this paper was a more detailed description of these methods and presentation of exemplary applications of these methods for structure refinement and improvement of mechanical properties of chosen materials. The results obtained in the present study show that the microstructures of the materials subjected to SPD studied in this work displayed considerable refinement, characterised by the formation of nanosized grains. Such a refinement resulted in increased tensile strength and hardness of the SPD materials studied in this work. In view of the results obtained on a large number of metals and alloys, a conclusion can be drawn that SPD could become an attractive way of processing materials for variety of applications.
Źródło:
Nukleonika; 2006, 51,suppl.1; 19-25
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical properties of sugar beet roots during harvest and storage
Autorzy:
Gorzelany, J.
Puchalski, C.
Powiązania:
https://bibliotekanauki.pl/articles/24107.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
deformation
root skin
mechanical harvesting
harvest
mechanical property
storage
root
sugar-beet
Źródło:
International Agrophysics; 2000, 14, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some mechanical properties of plantain fruit
Autorzy:
Asoegwu, S.N.
Nwandikom, G.I.
Nwammuo, O.P.
Powiązania:
https://bibliotekanauki.pl/articles/24410.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
plantain
deformation
Musa paradisiaca
rupture parameter
mechanical property
fruit
Źródło:
International Agrophysics; 1998, 12, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Properties and Microstructure of WE43 Mg Alloy Processed by Warm ECAP Followed by Extrusion
Autorzy:
Torkian, A.
Faraji, G.
Karimpour, M.
Powiązania:
https://bibliotekanauki.pl/articles/352278.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
severe plastic deformation
WE43
microstructure
hardness
mechanical properties
Opis:
In the present paper, the effects of the subsequent extrusion after multi-pass equal-channel angular pressing (ECAP) process on the mechanical properties and microstructure of WE43 magnesium alloy are investigated. First, second and fourth passes ECAP followed by an extrusion process are applied on WE43 magnesium alloy to refine the microstructure and to improve the mechanical properties for biomedical applications. The results showed that among the ECAPed samples, the highest and lowest strength were obtained in the second and the first pass processed samples, respectively. The four passes processed sample showe d the highest elongation to failure with moderate strength. The sample processed via first pass ECAP followed by extrusion exhibi ts an excellent combination of ductility and strength. The highest strength was obtained in the sample processed via the second pa ss ECAP followed by extrusion while the highest elongation was achieved in the sample processed via fourth pass ECAP followed by extrusion. Moreover, Vickers micro-indentation tests demonstrate that hardness is enhanced by an increase in the number of ECAP passes. Furthermore, a grain refinement process is presented for ECAP processing of WE43 alloy which shows a good agreement with microstructural investigations.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1093-1100
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure-Properties Relationship and Mechanical Stability of Retained Austenite in Thermomechanically Processed Medium-C TRIP Steel at Different Deformation Temperatures
Autorzy:
Skowronek, A.
Kozłowska, A.
Grajcar, A.
Morawiec, M.
Powiązania:
https://bibliotekanauki.pl/articles/354757.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
TRIP effect
multiphase steel
retained austenite
mechanical stability
deformation temperature
Opis:
The paper presents the effect of deformation temperature on the mechanical stability of retained austenite in a multiphase TRIP steel. Series of static tensile tests were carried out in the temperature range –20 to 140°C in order to simulate the temperatures occurring during stamping process of automotive steel sheets and conditions of their exploitation. Samples deformed at 20°C and 60°C showed the best combination of strength and ductility. It was related to the gradual transformation of retained austenite into martensite. Obtained results revealed that the intensity of TRIP effect is significantly related to the deformation temperature. The amount of retained austenite, which transformed into martensite during plastic deformation decreases as the deformation temperature increases. It was also found that the stability of retained austenite depends on its morphology. The obtained results showed the relationship between deformation temperature and the stability of retained austenite. The chemical composition and microstructure of multiphase steels dedicated to the automotive industry should be designed for providing the maximum TRIP effect at the specific deformation temperatures.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 941-949
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Increasing the erosive wear resistance of selected iron alloys by mechanical strain hardening of structure
Zwiekszenie odpornosci wybranych stopow zelaza na zuzycie erozyjne poprzez mechaniczne odksztalcenia struktury
Autorzy:
Pirowski, Z.
Olszynski, J.
Gwizdz, A.
Powiązania:
https://bibliotekanauki.pl/articles/793493.pdf
Data publikacji:
2011
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
iron alloy
mechanical strain hardening
plastic deformation
deformation resistance
erosive wear resistance
internal stress
tensile stress
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2011, 11
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vlijanie temperatury oksidirovanija na mikromekhanicheskije i tribologicheskie svojjstva splava sistemy Nb-Ti-Al
Effect of the oxidation temperature on the micro-mechanical and tribological properties of Nb-Ti-Al alloy
Autorzy:
Vasyliv, C.
Vynar, V.
Ratska, N.
Panasyuk, P.
Powiązania:
https://bibliotekanauki.pl/articles/77713.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
oxidation
temperature
niobium-titanium-aluminium alloy
tribological property
micro-mechanical property
internal stress
mechanical characteristics
deformation
Opis:
The effect of temperature oxidation on micromechanical properties and the tribological behavior of the alloy Nb-Ti-Al has been investigated. The increasing of annealing temperature from 300 to 900 C leads to increasing of the internal stresses and microhardness in the micro/nanoscale of crystal lattice and reducing of the plasticity. The tribological properties of alloy after oxidation at temperature 500C are optimal. At this temperature dispersion strengthening of alloy creates a minimum internal pressure and provides good plasticity of surface.
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 4
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanizmy odkształcenia dynamicznego w ultrawytrzymałych stalach nanostrukturalnych przeznaczonych na pancerze
The mechanisms of dynamic deformation in ultrahighstrength nanostructured steels for armours
Autorzy:
Garbarz, B.
Marcisz, J.
Burian, W.
Wiśniewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/235016.pdf
Data publikacji:
2011
Wydawca:
Wojskowy Instytut Techniczny Uzbrojenia
Tematy:
mechanizmy odkształcenia
właściwości mechaniczne
nanokrystaliczne metale
deformation mechanisms
mechanical properties
nanocrystalline metals
Opis:
W artykule przedstawiono wyniki badań morfologii i mikrostruktury obszarów odkształconych dynamiczne w ostrzelanych pociskami płytkach z dwóch nowych gatunków stali nanokrystalicznych. Badania wykonano na próbkach z nanokompozytowej stali bainityczno – austenitycznej (stal NBA) i ultrawytrzymałej stali maraging (stal MAR). Oceniono efekty ostrzału testowych płytek ze stali nanokrystalicznych. W ostrzelanych płytkach z obydwu stali w sąsiedztwie krawędzi krateru stwierdzono strukturalne efekty odkształcenia osnowy. W strefie odkształcenia powstały adiabatyczne pasma ścinania oraz mikropęknięcia. Średnia twardość adiabatycznych pasm ścinania w stali NBA jest wyższa od średniej twardość osnowy tej stali, natomiast w stali MAR stwierdzono efekt odwrotny - średnia twardość adiabatycznych pasm ścinania jest niższa od średniej twardości osnowy tej stali.
Results of investigation of morphology and microstructure in dynamically deformed areas of fired with projectiles plates made of new grades of nanocrystalline steels have been presented. Investigation was carried out on specimens of nanocomposite bainite – austenite steel (NBA steel) and ultrastrength maraging steel (MAR steel). Effects of firing at test plates of the nanocrystalline steels have been assessed. In the plates of the both steels tested by firing in areas close to edge of the crater structural features of matrix deformation were found. In the deformation areas adiabatic shear bands and microcracks formed. Average hardness of adiabatic shear bands in NBA steel is higher than average hardness of matrix of this steel while in MAR steel an opposite effect was found – average hardness of adiabatic shear bands was lower than average hardness of matrix of this steel.
Źródło:
Problemy Techniki Uzbrojenia; 2011, R. 40, z. 118; 41-49
1230-3801
Pojawia się w:
Problemy Techniki Uzbrojenia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic emission as a method for the detection of fractures in the plant tissue caused by the external forces
Autorzy:
Zdunek, A.
Konstankiewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/25704.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
potato tissue
deformation
stress level
acoustic emission
mechanical parameter
cell structure
plant tissue
Źródło:
International Agrophysics; 1997, 11, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical properties of pea seed coat
Autorzy:
Dobrzanski, B.
Szot, B.
Powiązania:
https://bibliotekanauki.pl/articles/25136.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
seed quality
drying
temperature
deformation
moisture content
pea
stress
mechanical property
seed
coat
Źródło:
International Agrophysics; 1997, 11, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Issledovanie fizicheskikh parametrov i mekhanicheskojj povrezhdaemosti tomatov. Obrabotka dannykh ehksperimentov i statisticheskaja model
Research of physical parameters and mechanical crashing of tomatoes. Statistical model
Autorzy:
Stepanova, E.
Powiązania:
https://bibliotekanauki.pl/articles/76665.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
working element
physical parameter
tomato
fruit processing
modern production
cleaning process
mechanical damage
vibration
deformation
physical property
mechanical property
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 5
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 41

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