Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "temperature deformations" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Closed system of coupling effects in generalized thermo-elastoplasticity
Autorzy:
Śloderbach, Z.
Powiązania:
https://bibliotekanauki.pl/articles/266002.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
termodynamika
sprzęgło
naprężenia
odkształcenia
tworzywa sztuczne
thermodynamic potentials
couplings effects
stresses
deformations
temperature
entropy
enthalpy
constitutive and rate equations
yield surface
plastic potential
Opis:
In this paper, the field equations of the generalized coupled thermoplasticity theory are derived using the postulates of classical thermodynamics of irreversible processses. Using the Legendre transformations two new thermodynamics potentials P and S depending upon internal thermodynamic forces Π are introduced. The most general form for all the thermodynamics potentials are assumed instead of the usually used additive form. Due to this assumption, it is possible to describe all the effects of thermomechanical couples and also the elastic-plastic coupling effects observed in such materials as rocks, soils, concretes and in some metalic materials. In this paper not only the usual postulate of existence of a dissipation qupotential (the Gyarmati postulate) is used to derive the velocity equation. The plastic flow constitutive equations have the character of non-associated flow laws even when the Gyarmati postulate is assumed. In general formulation, the plastic strain rate tensor is normal to the surface of the generalized function of plastic flow defined in the the space of internal thermodynamic forces Π but is not normal to the yield surface. However, in general formulation and after the use the Gyarmati postulate, the direction of the sum of the plastic strain rate tensor and the coupled elastic strain rate tensor is normal to the yield surface.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 2; 461-483
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vlianie povysennogo urovna teplovoj zascity na dolgovecnost’ trehslojnyh sten s oblicovkoj iz kirpica v usloviah Rossijskoj Federacii
Durability of Three-Layer Walls with Brick Facing with High Level of Thermal Protection
Autorzy:
Umnakova, N. P.
Powiązania:
https://bibliotekanauki.pl/articles/2065102.pdf
Data publikacji:
2012
Wydawca:
Politechnika Częstochowska
Tematy:
brick facing
three-layer walls
heater
defects
temperature of external air
amplitude
temperature deformations
tension
Opis:
V dannoj stat’e proanalizirowana odna iz pricin razrusenia naruznyh sten s effektivnym uteplitelem tolscinoj 120-150 mm. i oblicovkoj iz kirpica v usloviah rascetnyh temperatur naruznogo vozduha nize minus 28˚C. Provedennyj sopostavitel’nyj analiz haraktera raspredelenia temperatur v tolsce trehslojnyh sten pokazal, cto polnoe promerzanie kripicnoj oblicovki pri tolscine uteplitela 120 mm proishodit pri temperature naruznogo vozduha minus 1˚C, v to vrema kak pri tolscine uteplitela 50 mm oblicovka promerzaet pri temperature naruznogo voduha minus 3˚C. Ucityvaa harakter raspredelenia srednih temperatur po mesacam, v tom cisle v osennij period, mozno predpolozit’, cto pri sredniej temperature noabra minus 2,2 ˚C veroatnost’ promerzania kripicnoj oblicovki pri bol’sej tolscine uteplitela znacitel’no vyse, cem pro 50-ti millimetrovom uteplitele. Analiz srednemesacnyh temperaur naruznogo vozduha i amplitudy ih kolebanij pozvolil ustanovit’, cto polnoe promerzanie naruznoj kripicnoj oblicovki pri tolscine uteplitela 120 mm proishodit v srednem v tecenie 6 mesacev, v to vrema kak pri maloj tolscine uteplitela polnoe promerzanie oblicovki mozet proishodit’ lis’ v tecenie 4 mesacev. Bol’saa tolscina teploizolacionnogo sloa privodit k tomu, cto temperaturnye deformacii i naprazenie v tolsce naruznogo sloa kirpica okazyvautsa bol’simi. Vse eti faktory v komplekse sposobstvuut uskorennomu razruseniu kirpicnoj oblicovki sloistyh sten.
This article examines possible reasons for three-layered external walls fracturing with efficient insulation of 120-150 mm thick. Exterior coating of these walls is made of brick. Comparative analysis of temperature distribution inside the walls showed that the full-depth freezing of the wall with insulation of 120 mm thick takes place when exterior temperature is under - 1˚C. However, the same effect on the walls with insulation of 50 mm thick occurs under exterior temperature of -3˚C. Taking into account the average monthly temperature pattern, particularly in autumn, it can be considered that under the average November temperature of -2,2˚C the chance of full-depth wall freezing with thicker insulation is higher than for the wall with only 50 mm of insulation. Analysis of the monthly average outdoor air temperatures and the ranges of their oscillations revealed that full-depth wall freezing with insulation of 120 mm thick takes place for 6 months, and for the same wall but with thinner insulation, that effect occurs only for 4 months. These calculations show that the thicker the insulation is, the bigger the temperature deformations and temperature stresses in the exterior brick layer are. All of it together speeds up brick veneer fracturing in the three-layered walls.
Źródło:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2012, 2 (10); 111--116
2299-8535
2544-963X
Pojawia się w:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal model of the spindle drive structure
Autorzy:
Winiarski, Z.
Kowal, Z.
Kwaśny, W.
Ha, J.-Y.
Powiązania:
https://bibliotekanauki.pl/articles/99430.pdf
Data publikacji:
2010
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machine tool
spindle unit temperature
thermal deformations
model
Opis:
A computation system dedicated for machine tool spindle drives is presented which integrates a FDM model with a FEM model. Modelling of heat exchange through coolers are discussed, as well as modelling of heat exchange between cooling-lubricating oil and gear transmissions, shafts and headstock walls. In modelling of heat exchange inside headstock, the use of additional elements - type "Fluid" and "Air" - is proposed. Sample modelling results are presented concerning a headstock from a drilling-milling machine tool for machining with high loads and are compared with experimental data.
Źródło:
Journal of Machine Engineering; 2010, 10, 4; 41-52
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

    Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies