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    Wyświetlanie 1-8 z 8
    Tytuł:
    Study on Dynamic Recrystallization Models of 21-4N Heat Resistant Steel
    Autorzy:
    Li, Yiming
    Huang, Xiaomin
    Ji, Hongchao
    Li, Yaogang
    Wang, Baoyu
    Tang, Xuefeng
    Powiązania:
    https://bibliotekanauki.pl/articles/2049422.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    21-4N
    hot deformation
    dynamic recrystallization
    critical strain
    volume fraction
    Opis:
    The high-temperature deformation process and dynamic recrystallization (DRX) process of 21-4N were investigated under the conditions of the deformation temperature range of 1273~1453K, the strain rate range of 0.01~10s-1 and the deformation degree of 60% (the total deformation is 0.916) by using Gleeble-1500D thermal simulated test machine. The curves of stress-strain (σ – ε) were obtained, and the curves of work hardening rate (θ) and strain (ε) were obtained by taking derivative of σ – ε. The DRX critical strains under different conditions were determined by the curves of work hardening rate (θ – ε), and the DRX critical strain model was established. The peak strains of 21-4N were obtained by the curves of σ – ε, the relationship between peak stress (σp) and critical strain (εc) was determined, and the peak strain model was established. The DRX volume fraction models of 21-4N were established by using Avrami equation. The DRX grain size of 21-4N was calculated by Image Pro Plus 6.0, and its DRX grain size models were established.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 145-152
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Nitrogen on the Dynamic Recrystallization Behaviors of Vanadium and Titanium Microalloyed Steels
    Autorzy:
    Baochun, Z.
    Tan, Z.
    Guiyan, L.
    Qiang, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/353138.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vanadium titanium and nitrogen microalloyed steels
    dynamic recrystallization
    effect of nitrogen
    critical strain
    hot deformation behavior
    Opis:
    The hot deformation behaviors of vanadium and titanium microalloyed steels containing different nitrogen contents were studied by performing hot compression tests at various temperatures ranging from 900 to 1050°C and strain rates ranging from 0.1 to 10 s-1. The flow stress curves of the experimental steels were analyzed and the effect of nitrogen on the hot deformation behaviors of the vanadium titanium and nitrogen microalloyed steels was discussed. The results reveal that the flow stress increases with increasing nitrogen addition and the critical strain for the onset of dynamic recrystallization(DRX) also increases by adding nitrogen. Therefore, larger strain should be applied to start DRX in the experimental steel containing higher nitrogen content. The material constants and activation energies for hot deformation were determined by regression method and the effect of nitrogen on the activation energy was also discussed referring to the activation energies from the previous researches. It is found that higher nitrogen content contributes to higher activation energy for hot deformation. Furthermore, the DRX kinetics models for the experimental steels were constructed by regression method and the effect of nitrogen on the DRX rate under various deformation conditions was analyzed. And the inhibition of DRX by increasing nitrogen content is confirmed.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 379-386
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stress Modified Critical Strain criterion for S235JR steel at low initial stress triaxiality
    Autorzy:
    Kossakowski, P. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/281624.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    Stress Modified Critical Strain (SMCS) criterion Gurson-Tvergaard-Needleman (GTN) material model
    numerical simulations
    S235JR steel
    Opis:
    Ductile fracture of low carbon structural steel (S235JR) at low initial stress triaxiality has been predicted using a method based on the Stress Modified Critical Strain (SMCS) crite- rion and the Gurson-Tvergaard-Needleman (GTN) material model. The influence of micro- defects on the material strength has been taken into account. The investigations, including tensile tests, have been conducted for standard cylindrical unnotched tensile specimens at low triaxial stresses. An advanced finite element method has been used to determine several SMCS model parameters.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2014, 52, 4; 995-1006
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stress and Strain Analysis and Microstructure of Al/Cu Clad Composite Fabricated by Cold Extrusion
    Autorzy:
    Junting, L.
    Yahong, X.
    Yongkang, L.
    Jianyong, L.
    Shuangjing, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/351206.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum/copper clad composite
    cold extrusion
    microstructure
    critical shear strain
    finite element method
    Opis:
    A five-zone describing model for extrusion of aluminum/copper clad composite was established. Stress and strain were also analyzed by finite element method. The distribution rules of grain size were researched by critical shear strain theory, and zoning phenomenon of grain size was discovered. The grain size of deformed aluminum material becomes gradually finer from center to the interface. The grain size is much fine and the critical shear strain reaches the maximum value in the interface. The grain size of copper material reduces gradually from center to both the interface and exterior surface, which is caused by the higher value of critical shear strain in the interface and exterior surface. The analysis results were verified by microstructure observation and mechanical properties test, indicating that the distribution of grain size for cold extrusion forming can be interpreted by critical shear strain theory.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 1813-1818
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability of inelastic bilayered conical shells
    Stateczność sprężysto-plastycznych powłok stożkowych
    Autorzy:
    Paczos, P.
    Zielnica, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/280471.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    elasto-plasticity
    stability
    shell theory
    geometrical nonlinearity
    critical load
    stress-strain relations
    Opis:
    The paper deals with the derivation of the basic stability equations of bilayered elastic-plastic conical shells and a approximate solution to these equations, both theroretocally and by numerical procedures. The subject of the analysis is a bilayered open conical shell under a combined load comprising longitudinal forces and external pressure. Kirchhoff-Love's hypotheses hold for the layers, and use is made of constitutive relations in the form of generalized Hooke's law for the elastic stability analysis, and the Prandtl-Reuss incremental plasticity theory for the stability analysis in the elastic-plastic range. The stability equations are derived using the virtual work principle, and Ritz's method is applied to solve the equations. An iterative computer algorithm has been developed which made it possible to analyse the shells in the elastic, elastic-plastic or totally plastic prebuckling state of stress. The numerical results are presented in diagrams.
    Tematem pracy jest wyprowadzenie podstawowych równań stateczności dwuwarstwowych otwartych sprężysto-plastycznych powłok stożkowych i przybliżone rozwiązanie tych równań w sposób analityczny i numeryczny. Przedmiotem analizy jest swobodnie podparta dwuwarstwowa powłoka w kształcie wycinka stożka poddana działaniu obciążenia złożonego w postaci sił podłużnych i ciśnienia poprzecznego. Równania stateczności wyprowadzono na podstawie zasady minimum energii potencjalnej powłoki, a do rozwiązania zastosowano metodę Ritza. Wyniki numeryczne otrzymano za pomocą specjalnie zbudowanej iteracyjnej procedury numerycznej z wykorzystaniem komputera.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2003, 41, 3; 575-591
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chislovoj metod opredelenija naprjazhenno-deformirovannogo sostojanija i kriticheskikh nagruzok poteri ustojjchivosti arok
    Analytical and numerical methods definition stress strain state and critical loads loss of stability of arches
    Autorzy:
    Shebanin, V.
    Bogza, V.
    Bogdanov, S.
    Hilko, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/76380.pdf
    Data publikacji:
    2013
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    configuration
    arched structure
    stress-strain state
    critical load
    stability loss
    numerical method
    analytical method
    Opis:
    The method of calculating the critical loss of stability loads of arches. The method is that arbitrary configuration arch replaced by the elastically connected elements for which at the given regular loads with appropriate boundary conditions at the ends of exact solutions are found for components of the stress-strain state.
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 2
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Odkształcalność piaskowców w świetle zmian wilgotności i smukłości próbek
    Deformability of sandstones in view of changes in humidity and slenderness ratio of samples
    Autorzy:
    Bukowska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075327.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    wilgotność
    smukłość
    moduł Younga
    moduł post-krytyczny
    odkształcenia
    piaskowce
    Górnośląskie Zagłębie Węglowe
    humidity
    slenderness ratio
    Young's modulus
    post-critical modulus
    strain
    sandstones
    Upper Silesian Coal Basin
    Opis:
    Natural humidity of rocks in the Upper Silesian Coal Basin results from the influence of mining activities and dewatering the rock mass. The state of humidity which best approximates laboratory rock tests to the conditions in the exploited rock mass is the capillary saturation state. Deformation properties of sandstones (Young’s modulus, post-peak failure modulus, critical strain, residual strain) were determined for samples of slenderness ratio of 1 and 2, which were loaded in a servo-controlled testing machine. In the samples of sandstones of different slenderness ratio, values of Young’s modulus decreased for the samples in dry-air condition and capillary saturation state. In the samples of rocks of different slenderness ratio, tested in the same state of humidity, an increase in the value of Young’s modulus was observed. The increase depends on grain size. Post-peak failure modulus of sandstones shows similar trends of changes depending on slenderness ratio, state of humidity of the samples and their grain size. In the conditions when the samples of sandstones of slenderness ratio of 1, were tested in two states of humidity, values of critical strain decreased by a few per cent. For the samples of greater slenderness ratio, which also were tested in two states of humidity there was an increase in the value of critical strain and in humidity. For the samples of slenderness ratio of 1 and 2 tested in dry-air condition and in capillary saturation state there was a decrease in the value of critical strain by a few tens percent. The trends of changes in values of residual strain are the same as of critical strain. Based on the conducted tests it was shown that humidity and slenderness ratio of the sandstone samples influence differently their deformability. Humidity has a greater influence on the value of Young’s modulus than slenderness ratio of the tested samples. For critical strain and residual strain it was demonstrated that slenderness ratio of the samples has a greater influence than humidity. Moreover, a greater influence of the value of residual strain, in comparison with the values of critical strain, was observed for sandstone samples of lower slenderness ratio.
    Źródło:
    Przegląd Geologiczny; 2015, 63, 10/3; 1230--1236
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stress-strain state simulation of non-uniformly heated elements of components and assemblies of automotive
    Autorzy:
    Hrevtsev, O.
    Selivanova, N.
    Popovych, P.
    Poberezhny, L.
    Brych, V. Ya.
    Rudyak, Yu.
    Shevchuk, O.
    Bakulina, N.
    Rozum, R.
    Buriak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201070.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    mathematical model
    elasticity theory
    axisymmetric problems
    critical infrastructure
    metal structures
    stress-strain state
    displacement functions
    thermal deformation
    thermodynamically inverse process
    cylinder
    finite length
    thickness
    model matematyczny
    teoria sprężystości
    symetria osiowa
    infrastruktura krytyczna
    konstrukcje metalowe
    stan naprężeń i odkształceń
    odkształcenie termiczne
    proces termodynamiczny
    proces odwracalny
    skończona długość
    grubość
    Opis:
    Purpose Develop a method for determining and evaluating the stress-strain state, particularly the distribution of thermomechanical stresses in the materials of individual rotating parts of vehicles. Design/methodology/approach The proposed method is based on the principle of gradual approximations of the solution when the boundary conditions are satisfied on the curvilinear limiting surfaces of the disk body. Findings The proposed method of determining and estimating the distribution of thermomechanical stresses in the disk material makes it possible to take into account the variable geometry: thickness and presence of a hole in the central part of the disk, also correctly determine stress-strain state at any point of unevenly heated rotating axial body. Research limitations/implications The work uses generally accepted assumptions and limitations for thermomechanical calculations. Originality/value It is proved that in real disks, the stress-strain state is spatial, and the well - known method based on the hypotheses of the plane-stress state does not provide the possibility of calculating the values of stresses in the thickness of the disk. The obtained results can be used to improve the methodology of auto technical examination of road accidents. In addition, they can be taken into account by bus drivers on urban routes when choosing a safe distance in heavy traffic, as well as design engineers of car brake systems.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 115, 1; 26--32
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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