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Wyszukujesz frazę "stress distributions" wg kryterium: Temat


Wyświetlanie 1-7 z 7
Tytuł:
Analytical study of stress distribution models for estimation of stresses beneath plain rigid wheels and a vertical force on TRI-1 lunar soil simulant
Autorzy:
Kumar, Pala Gireesh
Jayalekshmi, S.
Powiązania:
https://bibliotekanauki.pl/articles/949136.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
TRI-1 lunar soil simulant
stress distributions
entry and exit angels
vertical force
DNSR and DSSR
Opis:
In this paper, three stress distribution models are considered, namely: Reece from 1965, Bekker from 1969, Wong-Reece from 1967. Two types of wheels are considered for the preset study, i.e., a small wheel with diameter of 160 mm and width 32 mm, whereas for a large wheel with diameter of 210 mm and width of 50 mm. TRI-1 or Tiruchirappalli soil simulant is considered for the interaction studies, which is an anorthosite based lunar soil simulant. The normal stress, shear stress and vertical forces are determined when the wheel starts moving on TRI-1 soil simulant. Entry and exit angles are also calculated for all models to estimate vertical forces. The maximum normal stress found for the small wheel was 32.121 kN/m2 (Wong-Reece model). In the case of the large wheel, the maximum normal stress was found to be 39.016 kN/m2 (Reece model). Vertical forces are found from the obtained normal stresses and shear stresses, and are presented graphically. The dimensionless stress ratio of both the wheels for the considered models, i.e., DNSR and DSSR, is also found.
Źródło:
Journal of Theoretical and Applied Mechanics; 2019, 57, 3; 791-802
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermo-mechanical stress analysis of dissimilar material joints using FEM
Autorzy:
Somadder, Somnath
Powiązania:
https://bibliotekanauki.pl/articles/1819195.pdf
Data publikacji:
2020
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
numerical investigation
dissimilar material joints
stress concentration
stress distributions
theory of elasticity
badania numeryczne
koncentracja naprężeń
rozkłady naprężeń
teoria sprężystości
Opis:
This article presents numerical investigation of isotropic dissimilar material joints. Dissimilar material joints are broadly used in in various structures, including offshore, nuclear, electronic packaging, IC chip and spacecraft various fields of science and technology. In bi-material joints two different material are bonded with common interface region. High stress concentration occur at the interface of the joint under thermo-mechanical loadings due to the difference in the elastic properties and the thermal expansion coefficients of dissimilar materials.The stresses acting along the interface of dissimilar material joints are very important to determine whether the structure is reliable or not for operation. The main purpose of this research is to provide finite element solutions to predict the stress distribution at the interface of the joint based on the theory of elasticity.
Źródło:
Journal of Mechanical and Energy Engineering; 2020, 4, 2; 147--154
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Post-critical deformation of thin-walled load-bearing aircraft structure representing fragment of the one-way torsion box
Autorzy:
Kopecki, Tomasz
Lis, Tomasz
Mazurek, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/103371.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
buckling
finite elements method
nonlinear analysis
polycarbonate
experimental stand
stress distributions
wyboczenie
metoda elementów skończonych
analiza nieliniowa
poliwęglan
stojak doświadczalny
rozkłady naprężeń
Opis:
The paper presents results of research on thin-walled load-bearing structure model representing a fragment of plane wing torsion box. The basis for obtaining data on deformation character and stability loss process was a model experiment conducted using a dedicated experimental stand. On the basis of experiment results, adequate numerical simulations were conducted using software based on finite elements method. Results of non-linear numerical analyses allowed to determine the character of stress distribution and formulate conclusions regarding behaviour of the post-critical deformations of the examined wing part.
Źródło:
Advances in Science and Technology. Research Journal; 2018, 12, 3; 203-209
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The FEM analysis of stress distribution in front of the crack tip and fracture process in the elements of modified and unmodified cast steel G17CrMo5-5
Autorzy:
Pała, R.
Dzioba, I.
Powiązania:
https://bibliotekanauki.pl/articles/387465.pdf
Data publikacji:
2016
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
fracture toughness
stress distributions in front of the crack
cast steel
fracture mechanisms
odporność na pękanie
rozkłady naprężeń
staliwa
mechanizmy pękania
pękanie
Opis:
The article presents influence of modification of the low-alloy cast steel G17CrMo5-5 by rare earth metals on stress distribution in front of the crack at the initial moment of the crack extension. Experimental studies include determination of strength and fracture toughness characteristics for unmodified (UM) and modified (M) cast steel. In the numerical computations, experimentally tested specimens SEN(B) were modelled. The true stress–strain curves for the UM and M cast steel are used in the calculation. The stress distributions in front of the crack were calculated at the initial moment of the crack extension. On the basis of data on the particle size inclusions in the UM and M cast steel, and the calculated stress distributions was performed an assessment of the possibility of the occurrence of cleavage fracture. The analysis results indicate that at room temperature for the UM cast steel, there is a possibility of cleavage fracture, while for the M cast steel occurrence of cleavage fracture is negligible.
Źródło:
Acta Mechanica et Automatica; 2016, 10, 3; 201-206
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental – Numerical Analysis of Stress State in Front of the Crack Tip of Modified and Unmodified G17CrMo5-5 Cast Steel by Rare Earth Metals in a Brittle-Ductile Transition Region
Autorzy:
Dzioba, I.
Pala, A.
Kasinska, J.
Powiązania:
https://bibliotekanauki.pl/articles/350967.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fracture toughness in a brittle-to-ductile transition region
stress distributions in front of the crack
cast steel
modification by rare earth metals
Opis:
In the paper presented experimental data and numerical analysis of stress distribution in front of the crack of two melts of low-alloy G17CrMo5-5 cast steel-modified (M) by rare earth metals and original, unmodified (UM) in the temperature range, according to the brittle-ductile transition region. Experimental tests include determination of the tensile properties and fracture toughness characteristics for the UM and M cast steel. Numerical analysis includes determination of stress distribution in front of the crack at the initial moment of the crack extension. In the numerical computations, experimentally tested specimens SEN(B) were modeled. The true stress-strain curves for the UM and M cast steel were used in the calculation. It was shown that the maximum of the opening stresses at the initial moment of the crack extension occurs in the axis of the specimens and reaches similar level of about 3.5σ0 for both UM and M cast steel. However, the length of the critical distance, measured for stress level equal 3σ0, is great for the M in comparison to the UM cast steel. Also was shown that the UM cast steel increased the level of the stress state triaxiality parameters that resulted in a decrease of fracture toughness.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2B; 1175-1181
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Local Strain Distribution of Cold-Rolled Alloy 690 on Primary Water Stress Corrosion Crack Growth Behavior
Autorzy:
Kim, S.-W.
Ahn, T.-Y.
Lim, Y.-S.
Hwang, S.-S.
Powiązania:
https://bibliotekanauki.pl/articles/354997.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
alloy 690
crack growth
electron backscatter diffraction
local strain distributions
stress corrosion cracking
Opis:
This work aims to study the stress corrosion crack growth behavior of cold-rolled Alloy 690 in the primary water of a pressurized water reactor. Compared with Alloy 600, which shows typical intergranular cracking along high angle grain boundaries, the cold-rolled Alloy 690, with its heterogeneous microstructure, revealed an abnormal crack growth behavior in mixed mode, that is, in transgranular cracking near a banded region, and in intergranular cracking in a matrix region. From local strain distribution analysis based on local mis-orientation, measured along the crack path using the electron back scattered diffraction method, it was suggested that the abnormal behavior was attributable to a heterogeneity of local strain distribution. In the cold-rolled Alloy 690, the stress corrosion crack grew through a highly strained area formed by a prior cold-rolling process in a direction perpendicular to the maximum principal stress applied during a subsequent stress corrosion cracking test.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1243-1248
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new lifetime distribution
Nowy rozkład cyklu życia
Autorzy:
Celik, N.
Guloksuz, C. T.
Powiązania:
https://bibliotekanauki.pl/articles/301097.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
rodzina rozkładów TX
funkcja niezawodności
współczynnik ryzyka
ucinanie typu II
T-X family of distributions
reliability function
hazard rate
Type II Censoring
Stress-Strength Probability
Opis:
The well-known statistical distributions such as Exponential, Weibull and Gamma distributions have been commonly used for analysing the different types of lifetime data. In this paper, following the idea of the extension of T-X family of distributions, we propose a new type of exponential distribution. We define the survival function, the hazard function and the mean time to failure related to this new distribution. Type II censoring procedure is also considered for this distribution. Additionally, stress-strength reliability and the maximum likelihood (ML) estimators of the unknown parameters are obtained. As an application, a real data set is used to show that the proposed distribution gives best fit than the alternative ones.
Powszechnie znane rozkłady statystyczne, takie jak rozkład wykładniczy, Weibulla czy rozkład Gamma znajdują szerokie zastosowanie w analizie różnych typów danych dotyczących cyklu życia. W niniejszym artykule, zaproponowano nowy typ rozkładu wykładniczego, w oparciu o rozszerzenie rodziny rozkładów TX. Zdefiniowano funkcję przeżycia, funkcję ryzyka (hazardu) oraz średni czas do uszkodzenia w odniesieniu do proponowanego rozkładu. Rozpatrywano także procedurę ucinania typu II dla nowego rozkładu. Dodatkowo określono niezawodność wytrzymałościową oraz estymatory największej wiarygodności nieznanych parametrów. Sposób wykorzystania proponowanego rozkładu zilustrowano wykorzystując rzeczywisty zbiór danych. Wykazano, że daje on lepsze dopasowanie niż modele alternatywne.
Źródło:
Eksploatacja i Niezawodność; 2017, 19, 4; 634-639
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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