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Wyszukujesz frazę "termodynamika" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Experimental regulating parameters of bladder-type hydraulic accumulator
Autorzy:
Zhuk, Volodymyr
Verbovskyi, Orest
Popadiuk, Ihor
Powiązania:
https://bibliotekanauki.pl/articles/2174165.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
akumulator hydrauliczny
pojemność magazynowa
termodynamika
discharge cycle
hydraulic accumulator
non-stationary expansion
polytropic index
storage volume
Opis:
Experimental regulating parameters of the non-stationary expansion of air inside a bladder-type hydraulic accumulator, working with the simple short pipeline, are presented in the paper. The technique of continuous online monitoring of changes in time of volume and absolute air pressure inside the hydraulic accumulator during the discharge process has been improved. Three series of experimental studies of transient gas processes inside the accumulator at different values of the average volume flow rate are made. Tendencies of change of the integral parameters of the hydraulic accumulator are obtained and analyzed depending on the serial number of the discharge cycle. A general dependence of dimensionless storage volume Kreg on the polytropic index n in series # 1–3, approximated by single power-law dependence, is obtained. The systematic changes of integral parameters in each subsequent discharge cycle can be explained by the non-stationary transient thermodynamic processes in air inside the accumulator until the thermodynamic equilibrium with the ambient air parameters is reached.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 1; 232--243
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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
    Wyświetlanie 1-2 z 2

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