Wyniki wyszukiwania - BazTech

1

Numerical study of the mechanical behaviour and damage of fgm bent pipes under internal pressure and combined bending moment

Houari Amin, Madani Kouider, Amroune Salah, Zouambi Leila, Elajrami Mohamed

Acta Mechanica et Automatica

|

2023

|

Vol. 17, no. 3

460--468

EN

The main objective of this work is the numerical prediction of the mechanical behaviour up to the damage of the bends of the functionally graded material (FGM) type ceramic/metal pipes. Firstly, the effective elastoplastic proper-ties of bent FGM pipes were determined using the homogenisation law by the Mori–Tanaka models for the elastic part and TTO (Tamura-Tomota-Ozawa) for the plastic part based on a rule of mixtures per function in the form of a power law. Our work also aims at the use of a meshing method (UMM) to predict the behaviour of the FGM by finite element in the mesh of the model. The analysis was performed using the UMM technique for different loading cases and volume fraction distribution. Two stages are necessary for the analysis of the damage: the first is the model of initiation of the damage established by the criterion of maximum deformation named MAXPE and the second is criterion of the energy of the rupture according to the theory Hillerborg used to determine damage evolution. Both stages involve a 3D finite element method analysis. However, for damage, the XFEM technique was used in our UMM method to predict crack initiation and propagation in FGM pipe bends. The results of the numerical analysis concerning the mechanical behavior showed, that if the nature of the bent pipes is in FGM, a good reduction of the various stresses compared to those where the nature of the pipe is metallic material. The results were presented in the form of a force–displacement curve. The validation of the proposed numerical methodology is highlighted by comparisons of current results with results from the literature, which showed good agreement. The analysis took into account the effect of the main parameters in a bent FGM pipe under internal pressure and bending moment on the variation of the force–strain curves.

2

Numerical study of a cracked pipeline under internal pressure

Abderraouf Khireche, Zohra Labed

Archives of Mechanical Technology and Materials

|

2020

|

Vol. 40

30--33

EN

In the industrial sectors, pipelines have been used as the most economical and safe means of transporting oil and gas (Pipelines). However, the number of accidents has increased considerably as their use has increased. As a result of the operating load and the pressure used, the thickness of the tube must be increased and the mechanical characteristics improved. This approach was applied to predict the growth of crack effect in samples of two pipelines at given thicknesses and pressures. We created cracks with deferential dimensions in both API X80 steel pipelines, with an application of deferential internal pressures. For the simulations, we used the code ANSYS.

3

Design Analysis of Closed Vessel for Power Cartridge Testing

Parate Bhupesh Ambadas, Chandel Sunil, Shekhar Himanshu

Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa

|

2019

|

Vol. 10, Nr 1 (35)

25--48

EN

This paper discusses the design analysis of closed vessel (CV) for power cartridge application in water-jet disruptor. In this article, various design theories are presented in which the vessel is subjected to internal pressure. CV is a kind of pressure vessel utilized to evaluate the performance of power cartridge used for water-jet application. It is a test vessel which generates pressure - time profile by burning the propellant. Energy derived from burning of the propellant of power cartridge aids in neutralizing Improvised Devices (IED's). This energy creates high water-jet plume in the disruptor. In order to evaluate various performance parameters of the cartridge, CV design plays a vital role in the research and development activities, including, development, life trials, production, lot proof trials and life extension / life revision trials. CV is one of the methodologies / techniques from which energy generated is measured in terms of the maximum pressure (Pmax) and the time to maximum pressure (TPmax). This paper also discusses about various design aspects using the finite element method (FEM) and their comparative results with different design theories. In the light of these theoretical, numerical, and experimental works, it was recommended that octahedral stress theory or van Mises theory should be used for vessel design. This satisfies the designer requirements. FEM analysis tool helps in reducing time & development cost.

4

An analysis of mechanical properties of porous material with coiled wire

Jakubowski A., Crasto R.

Journal of Machine Construction and Maintenance - Problemy Eksploatacji

|

2018

|

no. 1

77--82

EN

This article examines the skeleton structure of a product from porous permeable material based on a wire coil. The product consists of a round, porous, thin-walled tube. Two variants of tube load are considered, i.e. those involving internal and external pressures of a working fluid. Mechanical properties of the material have been analyzed. It has been found that the strength and stiffness of the tube depend on the quality of wire coil bonding, which results from technological parameters.

PL

Opisano szkieletową strukturę wyrobu z porowatego przenikalnego materiału na podstawie nawijanego drutu. Wyrób przedstawiony w postaci porowatej okrągłej cienkościennej rurki. Rozpatrywano dwa schematy obciążenia rurki środowiskiem roboczym - ciśnieniem wewnętrznym i zewnętrznym. Zostały analitycznie zbadane właściwości mechaniczne materiału i ustalono, że jego wytrzymałość i sztywność zależą od jakości przyczepności zwojów drutu, które są związane z technologicznymi warunkami produkowania.

5

Pressure measurement as a tool to identify moisture transport mechanisms in convective drying of non-shrinking material

Adamska A., Pakowski Z.

Acta Innovations

|

2018

|

no. 27

46--52

EN

The drying process is one of the most important stages in the production of building materials. The choice of the drying method affects the chemical and physical properties of the final product. The aim of this research is to measure and analyze the dynamic changes of internal pressure in non-shrinking, porous material during convective drying. In this work the problem will be discussed with special attention to the behavior of rewetted plaster. A commercial gypsum of company PIOTROWICE II (Alpol brand), typically used in construction and decorative plastering was applied. Gypsum was mixed with water in recommended proportion of 0.6 water/gypsum and drying experiments were performed at 50°C. The changes in sample overall mass as well as pressure and material temperature on the midpoint of sample axis were monitored. On the basis of the obtained experimental data of axial pressure, it is possible to perform a more detailed analysis of mass and heat transfer mechanisms than based on the drying kinetics alone. The pressure trends in the sample allow one to determine the moment of transition from the first to the second drying period, without the need to determine the kinetics of drying. The element of novelty consists of using a direct internal pressure measurement to provide information on the variation of the actual drying rate and mass transfer mechanisms.

6

The influence of variations of geometrical parameters on the notching stress intensity factors of cylindrical shells

Moustabchir H., Hamdi Alaoui M. A., Babaoui A., Dearn K. D., Pruncu C. I., Azari Z.

Journal of Theoretical and Applied Mechanics

|

2017

|

Vol. 55 nr 2

559—569

EN

The modern approach of Virtual Engineering allows one to detect with some accuracy the residual life of components especially free of cracks. The life estimation becomes cumbersome when the components contain a crack. A straightforward formulation requires a parameter that considers geometrical constraints and materials properties. The magnitude of the stress singularity developed by the tip of a crack, needs to be expressed by the Stress Intensity Factors (SIF). In order to prove the validity of the results, calibration by experimental and/or analytical technique is required. To have a better understanding of this parameter, in the first part of this paper an analytical model to compute the SIF connected to crack propagation into Mode I has been implemented. The case study displays a pipeline component with a crack defect submitted to internal pressure. Therefore, an appropriate correlation between the analytical approach and numerical simulation has been established embedded.

7

Approximate mechanical behavior analysis of a thick-wall metallic liner reinforced with composites, submitted to internal pressure

Vargas-Rojas E., Palacios-Montúfar C., Hernández-Moreno H., González-Velázquez J. L.

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2016

|

Vol. 64, nr 1

219--233

EN

This study aims to simulate and to analyze the elastic and the damage behavior of a reinforced metallic liner (RML) by means of a computational tool, in order to aid in the design of high specific-stiffness and -strength barrels for heavy-duty hydraulic applications. Case studies for the program validation are undertaken using an AISI 1026 or St52.3 steel tubing reinforced with a polymeric composite of glass fiber and epoxy resin, wound in a hoop pattern. The mechanical behavior of the RML under internal pressure with no-end effects is predicted by means of strain measurements at the outermost layer. The mathematical model is based on the Classical Lamination Theory (CLT) improved with kinematic relationships that allow to introduce curvature effects. Numerical results based on experimental measurements show that the reinforcement is effective, allowing to considerably augment the maximum bearable pressure with respect to a non-reinforced metallic liner (nRML), without important weight or cost increase.

8

Can DIPPR Database be Used for an Estimation of the Speed of Sound? A Case Study of Liquid Hydrocarbons

Postnikov E. B.

Archives of Acoustics

|

2016

|

Vol. 41, No. 4

713--719

EN

The paper analyses a possibility of utilising the information which is contained in DIPPR database for a calculation of the speed of sound, which is absent there. As an example, liquid hydrocarbons are considered: n-hexane, 1-hexene, cyclohexane, cyclohexene, benzene, and 1-hexanols, as well as representatives of n-alkanes with various hydrocarbon chain lengths. It is shown that the Brelvi-O’Connell correlation for the reduced bulk modulus, supplied with the correlations for the internal pressure at the normal boiling temperature, results in the values having accuracy comparable with other DIPPR data for the region below the boiling point bounded by the values of the reduced density around pr ≈ 3.5. The source of errors originated from the Brelvi-O’Connell correlation for larger reduced densities is discussed.

9

Acoustic Nonlinearity Parameter B/A, Internal Pressure, and Acoustic Impedance Determined at Pressures up to 100 MPa for 1-Ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide

Zorębski E., Zorębski M., Dzida M.

Archives of Acoustics

|

2016

|

Vol. 41, No. 1

59--66

EN

The nonlinearity parameter B/A, internal pressure, and acoustic impedance are calculated for a room temperature ionic liquid, i.e. for 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl] imide for temperatures from (288.15 to 318.15) K and pressures up to 100 MPa. The B/A calculations are made by means of a thermodynamic method. The decrease of B/A values with the increasing pressure is observed. At the same time B/A is temperature independent in the range studied. The results are compared with corresponding data for organic molecular liquids. The isotherms of internal pressure cross at pressure in the vicinity of 70 MPa, i.e. in this range the internal pressure is temperature independent.

10

Szybka identyfikacja składu syntetycznych czynników chłodniczych

Wróblewska-Jędrzejewska M, Stęplewska U.

Technika Chłodnicza i Klimatyzacyjna

|

2015

|

nr 5

167--173

PL

Syntetyczne czynniki chłodnicze w przypadku wycieku z instalacji powodują niszczenie warstwy ozonowej i wzmocnienie efektu cieplarnianego. W związku z tym w celu ograniczenia tych oddziaływań, konieczna jest jak najwcześniejsza identyfikacja niepożądanej emisji tych substancji. W publikacji zaprezentowano szybką metodę analizy mieszanin czynników chłodniczych przy wykorzystaniu chromatografu gazowego z detektorem FID i układem chłodzącym z ciekłym CO2. W trakcie badań zaobserwowano wysoką powtarzalność czasów retencji oraz powierzchni pików dla wykonanych analiz. Chromatograficzna metoda analizy niskotemperaturowej mieszanin czynników syntetycznych z zastosowaniem detektora FID i układu chłodzącego, w opinii autorek artykułu, wykazuje duży potencjał aplikacyjny.

EN

Synthetic refrigerants ("freons") in the ease of leakage from the installation cause the ozone layer detection and increase the greenhouse effect. In order to minimize these global threats, it is necessary to detect these substances emissions as soon as possible. The new analysis method for synthetic refrigerants mixtures using a gas chromatograph with FID detector and Iiquid CO2 cooling system was developed. The impact of various parameters and analysis conditions on the synthetic refrigerants mixtures separation was examined at Jaw temperature conditions. The optimization of the most important parameters of the chromatographic method, which allows the separation of commercial refrigerants mixtures IR402A, R404A, R409A, R407C, R410A, R413A, R507 and R422D) was carried out. The best chromatographic selection of the model mixture (eleven component synthetic refrigerants) has been obtained for the isothermal method. The high repeatability of the retention limes and the peak areas for the performed analyses was observed. The chromatographic method for the low temperature analysis of the mixture synthetic refrigerants, using the FID detector and the cooling system has a high potential for practical application.

11

Obliczenia statyczno-wytrzymałościowe rur żeliwnych

Grosel J., Kolonko A., Wysocki L.

Instal

|

2015

|

nr 5

35--38

PL

W artykule omówiono wybrane problemy obliczeń statyczno-wytrzymałościowych ciśnieniowych rur żeliwnych. Obliczenia rur na ciśnienie wewnętrzne są dobrze opracowane, pewne dyskusje dotyczą tylko przyjmowania wielkości współczynnika bezpieczeństwa. Znacznie więcej problemów sprawiają obliczenia rur odwodnionych, obciążonych tylko parciem gruntu i obciążeniami komunikacyjnymi (dla rur ułożonych w jezdni). W artykule zaprezentowano analizę najczęściej stosowanych metod obliczeniowych obciążeń rur ułożonych w gruncie.

EN

The article presents selected problems regarding static-strength calculations of pressure cast iron pipes. Calculations of pipes due to internal pressure is a well-known and described issue and some discussions concern only the assumption of the safety factor value. Calculations of empty pipes under soil pressure and traffic loads (for pipes laid along the road) are more problematic. The article presents an analysis of the most commonly used methods of calculating pipes laid in the ground due to variable loads.

12

Otwory w powłokach walcowych pod ciśnieniem wewnętrznym

Wikira R.

Dozór Techniczny

|

2012

|

z. 1

9--12

13

Badania wpływu wybranych parametrów ciągnikowych opon napędowych na strukturę agregatową gleby lekkiej w koleinach

Błaszkiewicz Z.

Inżynieria Rolnicza

|

2010

|

R. 14, nr 1

73-78

PL

W pracy przedstawiono wyniki badań polowych nad wpływem wybranych parametrów ciągnikowych opon napędowych 13,6-36, 16,4-34 i 23,1-26 na strukturę agregatową wierzchniej warstwy gleby lekkiej w koleinach. Wykazano, że przejazd po glebie spulchnionej badanych opon pod obciążeniem standardowego ciągnika o masie 4,5 Mg jest głównym czynnikiem zdecydowanie pogarszającym stan struktury agregatowej. Stwierdzono, że wielkość tych zmian w glebie jest w małym stopniu uzależniona od obciążenia normalnego, ciśnienia wewnętrznego i dodatniego poślizgu kół.

EN

The paper presents results of field research on the impact of selected parameters of tractor drive tyres (13.6-36, 16.4-34 and 23.1-26) on aggregate structure of light topsoil in wheel tracks. It has been proven that a run of the tested tyres on loosened soil under the load of standard tractor with mass of 4.5 Mg is the main factor decidedly deteriorating aggregate structure condition. It has been observed that the scale of these changes in soil depends only to a small extent on normal load, internal pressure, and positive slip of wheels.

14

Failure criteria used in structural optimization

Błachut J.

Czasopismo Techniczne. Mechanika

|

2008

|

R. 105, z. 4-M

5-18

EN

Mechanisms of the loss of structural integrity, i.e. bifurcation, snap-through, first-cycle shakedown, burst pressure, brittle failure, etc. are discussed for internally and for externally pressurised domed closures onto cylindrical pressure vessels. The concept of a plastic load and its suitability for optimal design of experimental results backing the concept.

PL

W artykule przedstawiono typowe mechanizmy utraty funkcjonalności zamknięć zbiorników cylindrycznych obciążonych ciśnieniem wewnętrznym lub zewnętrznym. Rozważono bifurkację, przeskok, sprężystą adaptację jednocyklową, wyczerpanie nośności, kruche zniszczenie itd. Wprowadzono też koncepcję obciążenia plastycznego oraz jego zastosowanie do optymalizacji dennic ze stali miękkiej. Przytoczono wyniki doświadczeń weryfikujących tę koncepcję.

15

Internal pressure as a function of pressure for alkanols

Zorębski E.

Molecular and Quantum Acoustics

|

2007

|

Vol. 28

319-327

EN

Internal pressure as a function of pressure was estimated from the literature data for five chosen alkanols (ethanol, 1-pentanol, 3-pentanol, 3-methyl-3-pentanol, and 3-ethyl-3-pentanol). The data on isothermal compressibility and isobaric coefficient of thermal expansion obtained from acoustic method were used. The results shown that internal pressure can reaches a maximum for moderate pressures and then decreases more and more rapidly.

16

Internal Pressure as a Function of Pressure

Zorębski E.

Molecular and Quantum Acoustics

|

2006

|

Vol. 27

327-336

EN

Internal pressure as a function of pressure was estimated from literature data. Mostly, the data on isothermal compressibility and isobaric coefficient of thermal expansion obtained from acoustic method were used. The results shown that internal pressure can reaches a maximum for moderate pressures and then decreases more and more rapidly.

17

Application of the Flory’s Model for Description Thermal Pressure Coefficient and Internal Pressure of the Liquid Mixtures

Dzida M.

Molecular and Quantum Acoustics

|

2006

|

Vol. 27

343-351

EN

The Flory’s model has been applied for description thermal pressure coefficient and internal pressure of six mixtures: cyclohexane + benzene, cyclohexane + tetrachloromethane, ethylbenzene + n-octane, ethylbenzene + n-decane, n-hexane + cyclohexane and n-hexane + perfluorohexane. The excess thermal pressure coefficient and excess internal pressure has been calculated from the model values of thermal pressure coefficient and internal pressure. The thermodynamically correct formulas of these excesses have been used. Two mixing rules for characteristic pressure of mixture have been applied. A good agreement between calculated and experimental values has been obtained.

18

Internal Pressure Studies of Alcohols on the Basis of Ultrasonic Measurements

Zorębski B.

Molecular and Quantum Acoustics

|

2005

|

Vol. 26

317-326

EN

Internal pressure was calculated for some alcohols from experimental data on isothermal compressibility and isobaric coefficient of thermal expansion as well as by using of the mean molecular radius, in most cases from the speed of ultrasound data. The results differ quantitatively as well as qualitatively and suggest, that calculation of internal pressure by using of the mean molecular radius is incorrect (obtained values are unreliable and unacceptable).

19

Wpływ obciążenia trójpunktowego układu zawieszenia i ciśnienia w ogumieniu ciągników rolniczych na strukturę agregatową gleby lekkiej

Błaszkiewicz Z., Sztukowski P.

Problemy Inżynierii Rolniczej

|

2001

|

R. 9, nr 1

5-12

PL

Przedstawiono wyniki badań polowych struktury agregatowej gleby lekkiej w koleinach kół przednich i w koleinach pociągowych ciągników rolniczych o różnych ciężarach: 19, 27,5 i 45 kN (C330, C360 i C1201) przy zmiennym obciążeniu normalnym tylnego trójpunktowego układu zawieszenia oraz ciśnieniu wewnętrznym w ogumieniu kół napędowych, obniżanym od 0,12 do 0,04 MPa.

EN

Paper presented the results of field tests dealing with the influence of three-point linkage load and driving tyre pressure of various class tractors on the structure of light soil in the ruts. The tests showed that the tyres of tractors cause, within the whole ranges of tested power lift loads and driving wheel tyre pressure, an increase in soil pulverisation and deterioration of aggregate soil structure in ruts behind the tractor. No similar changes in soil structure in ruts behind the tractor due to power lifts of different tractors and driving wheel tyre pressure were observed. The final state of soil aggregate structure in ruts was affected by driving wheels of the tractors.

20

Kształtowanie ciśnieniem wewnętrznym spieków z kompozytu Cu-Al2O3

Cyunczyk A.

Obróbka Plastyczna Metali

|

2001

|

T. 12, nr 5

35-42

PL

Przedstawione badania dotyczą niekonwencjonalnego sposobu wytwarzania spieków, w którym ciśnienie wewnętrzne, pochodzące od gazu zamkniętego w porach materiału, wykorzystuje się do zmiany kształtu wypraski podczas spiekania. W artykule opisano wyniki eksperymentu, podjętego w celu określenia wpływu dyspersyjnej fazy tlenku glinu na przebieg kształtującego spiekania wyrobów z kompozytu Cu-AI2O3. Dobre odwzorowanie kształtu wyrobu i efektywność procesu spiekania kształtującego są uwarunkowane drobnoziarnistą strukturą kompozytu Cu-AI2O3.

EN

The investigations have respect to a non-traditional technique which utilized the energy of the compressed gases in the closed pores for changing the shape of an individual compact during sintering in a designed mould. In this paper the influence of the addition of dispersed alumina on a course of formative sintering of copper compacts is presented. Good efficiency of the formative sintering and accuracy of forming are conditioned by fine-grained structure of Cu-AI2C3 composite.