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Tytuł:
CFD-DEM simulation of raceway size and mechanical characteristics of industrial scale blast furnace
Autorzy:
Gao, Yuzhen
Chan, Choon Kit
Powiązania:
https://bibliotekanauki.pl/articles/27315659.pdf
Data publikacji:
2023
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
raceway
CFD-DEM
Computional Fluid Dynamics
Discrete Element Method
numerical simulation
blast furnace
Opis:
The raceway plays a crucial role in ensuring the stable functioning of the ironmaking blast furnace. It is the key site where the chemical reaction of coke combustion takes place, providing the necessary heat and reducing gas for the upper iron ore reduction process. Consequently, the size of the raceway serves as an essential indicator of the blast furnace’s operational condition. In this study, a mathematical model for the raceway of an industrial-scale blast furnace was established. Extensive innovation investigations were conducted to explore the characteristics pertaining to the raceway’s size. The simulation outcomes demonstrate that both the particle size and the inlet velocity exert significant influences on the raceway dimensions. Specifically, the height of the raceway is predominantly affected by the particle size, whereas the inlet velocity predominantly influences the depth of the raceway.
Źródło:
Polish Journal of Chemical Technology; 2023, 25, 3; 71--78
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Damage localization in truss girders by an application of the discrete wavelet transform
Autorzy:
Knitter-Piątkowska, Anna
Kawa, Olga
Guminiak, Michał Jan
Powiązania:
https://bibliotekanauki.pl/articles/2204501.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
truss structures
damage localization
finite element method
discrete wavelet transform
konstrukcja kratownicowa
lokalizacja uszkodzeń
metoda elementów skończonych
dyskretna transformata falkowa
Opis:
The paper demonstrates the potential of wavelet transform in a discrete form for structural damage localization. The efficiency of the method is tested through a series of numerical examples, where the real flat truss girder is simulated by a parameterized finite element model. The welded joints are introduced into the girder and classic code loads are applied. The static vertical deflections and rotation angles of steel truss structure are taken into consideration, structural response signals are computed at discrete points uniformly distributed along the upper or lower chord. Signal decomposition is performed according to the Mallat pyramid algorithm. The performed analyses proved that the application of DWT to decompose structural response signals is very effective in determining the location of the defect. Evident disturbances of the transformed signals, including high peaks, are expected as an indicator of the defect existence in the structure. The authors succeeded for the first time in the detection of breaking the weld in the truss node as well as proved that the defect can be located in the diagonals.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 1; art. no. e144581
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of a viscoelastic boundary condition to Yade – open source DEM software
Autorzy:
Brzeziński, Karol
Zbiciak, Artur
Gladky, Anton
Powiązania:
https://bibliotekanauki.pl/articles/2200894.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
Discrete Element Method
viscoelastic boundary condition
granular layer
pavement subsoil
Opis:
The paper presents implementation of a viscoelastic boundary condition to Yade software. The implemented boundary condition constraints linear displacements of bodies by applying a reaction force resulting from a solution of the Burgers rheologicalmodel. This work presents the results of one of validation tests, where the output of Discrete Element Simulation (DEM) was compared with an analytically formulated soft-contact problem. Furthermore, potential application in more complex simulations (plate load test) is demonstrated. It shows that the proposed approach allows for realistic yet efficient modeling of foundations purely within the DEM framework.
Źródło:
Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 355--364
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-uniqueness of fracture parameter choice in simulations of concrete cracking at mesoscale level
Autorzy:
Kondys, B.
Bobinski, J.
Marzec, I.
Powiązania:
https://bibliotekanauki.pl/articles/38697099.pdf
Data publikacji:
2023
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
concrete mesostructured
Finite Element Method
discrete cracks
cohesive elements
wedge splitting test
beam under bending
Opis:
In the paper a non-uniqueness of fracture parameter choice in simulations of cracking process in plain concrete specimens at mesoscale level under monotonic static loading is analysed. The Finite Element Method is used, where cracks are defined in a discrete way using interface cohesive elements with nonlinear material law including softening. The concrete mesostructure (such as: cement matrix, air voids, aggregates, and Interfacial Transitions Zones (ITZ)) is taken into account. Two benchmarks: Montevideo splitting test (MVD) as a main test and the three-point beam bending test (TPBT) as an auxiliary problem are simulated. Results from 2D calculations are compared with experimental outcomes, especially force-crack opening curves and crack patterns are carefully studied. In the MVD test, the mesostructure of a specimen is taken from X-ray micro-computed tomography scans of real samples. The issue of the proper selection of material parameters for cohesive cracks is investigated. The ambiguity of such a process is presented and discussed. It turns out the numerical simulations can give the same outcome for different values of material parameters. The influence of the selected material parameters and the friction coefficient on results (force–crack opening curves and crack patterns) is also analysed.
Źródło:
Archives of Mechanics; 2023, 75, 3; 365-396
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical modelling of SS316L powder flowability for laser powder-bed fusion
Autorzy:
Bouabbou, A.
Vaudreuil, S.
Powiązania:
https://bibliotekanauki.pl/articles/24200626.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
discrete element method
flowability
hall
flow
metal powder
SS316L
LIGGGHTS
metoda elementów dyskretnych
płynność
przepływ
hala
proszek metalowy
LIGGHTS
Opis:
Purpose: This work aims to improve the powder-bed spreading process for laser powder bed fusion additive manufacturing by gaining a greater understanding of metal powder flowability through numerical modelling and in-situ experimentation. Design/methodology/approach: Using the Discrete Element Method (DEM) to study the flowability of the powder and its intrinsic properties. A high-fidelity particle-scale model was developed to capture the dynamics of metal particle interactions in a virtual Hall flow meter based on a modified Beverloo law. The results are validated experimentally using the Hall flow static powder characterisation technique. Findings: For SS316L powder alloy with the hall-value of 29s/50g and with an angle of repose (AOR) of 32°, the modelled powder that exhibited the same flow behaviour was found using 0.5 for both rolling and sliding coefficients resulting in simulated Hall value of 28.55s/50g with a simulated flow rate of 0.571 g/s, which is validated by AOR of the simulated powder [31.2°- 32.6°]. However, rolling friction had minimal effect on the mass flow rate but increased the angle of repose. Sliding friction significantly decreased the mass flow rate and increased AOR. Research limitations/implications: DEM is an ideal method to study flowability. However, there are certain constraints imposed on the computational power by a number of simulated particles and simulation time-step. Future research may involve investigating other dynamic flowability characterisation techniques. Practical implications: Enabling a better understanding of powder particle flow at a micro-scale by modelling powder flowability. This leads to simulating a more realistic powder bed and improving the powder spreading process, leading to better AM parts quality. Originality/value: This paper provides a unique approach for modelling the flowability of SS316L powder using a Beverloo law-based design of the Hall flow meter. This will improve the modelling of the spreading process needed for metal 3D printing.
Źródło:
Archives of Materials Science and Engineering; 2023, 120, 1; 22--29
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research on the linear viscoelastic rheological properties of rejuvenated asphalt mastic based on the discrete element method
Autorzy:
Lin, Mei
Lei, Yu
Li, Ping
Shuai, Jun
Wang, Zhaoli
Powiązania:
https://bibliotekanauki.pl/articles/27312105.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
model konstytutywny
metoda elementów dyskretnych
mastyks asfaltowy odnowiony
właściwości reologiczne
constitutive model
discrete element method
rejuvenated asphalt mastic
rheological characteristics
Opis:
The rheological property of asphalt is an important factor affecting the pavement performance of asphalt binder, and the fundamental reason for the change of asphalt rheological property is the strong evolution of asphalt material meso structure. However, the internal mechanism of rejuvenated asphalt mastic system is complex and its rules are difficult to grasp. Aiming to study the relationship between meso mechanical parameters and rheological parameters of rejuvenated asphalt mastic, the meso structure model of rejuvenated asphalt mastic was established and improved based on the discrete element method. Moreover, the meso parameters of the model were obtained by the objective function method, and then the influences of various factors were studied to construct the mathematical constitutive model of rheological parameter modulus and meso mechanical parameters. Combing with the reliability of the improved Burgers model was verified based on the rheological test results of rejuvenated asphalt mastic. In addition, the virtual test of dynamic shear rheological dynamic frequency scanning was carried out on the asphalt mastic sample by particle flow software. By adjusting the mesomechanical parameters, the simulation results (complex shear modulus and phase angle) were consistent with the test results. This study clarified the relationship between mesomechanics and macro performance, and this model could be used to obtain the complex shear modulus of rejuvenated asphalt mastic under different types, filler-asphalt ratio and external force environments by adjusting particle flow, wall boundary and other conditions, which can greatly save the workload for the later research and provide a theoretical basis for production experiments.
Źródło:
Archives of Civil Engineering; 2023, 69, 2; 399--416
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The vertical screw conveying characteristics of cohesive particle and optimization of design parameters
Autorzy:
Chen, Suifan
Zhang, Xiaomeng
Li, Qipeng
Shen, Ce
Shi, Yongchang
Powiązania:
https://bibliotekanauki.pl/articles/24200814.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
discrete element method
conveying characteristics
NSGA-II
comprehensive evaluation
Opis:
The purpose of this paper is to solve the problem of low conveying efficiency and serious blade wear during vertical screw conveying of cohesive particles. Firstly, the reliability of DEM simulation was verified by comparing the simulated and theoretical values and the influence regularity of different design parameters (rotational speed, pitch, and clearance) on screw conveying characteristics were analyzed based on DEM. In addition, the effect of design parameters on the screw conveying characteristics is identified by ANOVA. Then, the multi-objective optimization model with the both of maximizing the average mass flow rate and minimizing the maximum wear depth of the blade was established using the polynomial fitting regression, which was solved by the non-dominated sorting genetic algorithm (NSGA-II). Finally, the comprehensive evaluation was used to determine the best design parameters. The above research results provide a certain reference for the study of cohesive particle’s vertical screw conveying characteristics and equipment optimization design.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 1; art. no. 13
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of DEM to characterize damage of delicate fruit on feeders with reciprocating drive
Wykorzystanie DEM do opisu uszkodzeń owoców delikatnych na podajniku z napędem posuwisto-zwrotnym
Autorzy:
Olejnik, Tomasz P.
Sobiecka, Elżbieta
Kryszak, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/27324228.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Skórzanego
Tematy:
blueberry
feeder
tangential forces
normal forces
DEM
discrete element method
borówka wysoka
podajnik
siły styczne
siły normalne
metoda elementów dyskretnych
Opis:
This article describes the modeling by DEM technology of damage to highbush blueberries, during transport on a reciprocating feeder. The modeled values of normal and tangential forces at the blueberry contact points were determined, and the effect of changing the mass output of the transported fruit on the values of normal and tangential forces was studied. It has been shown that the change in the mass output of blueberries does not exceed the permissible tangential and normal forces, interacting between the fruits.
W artykule opisano modelowanie technologią DEM uszkodzeń borówki wysokiej, podczas transportu na podajniku z napędem posuwisto-zwrotnym. Określono modelowe wartości sił normalnych oraz stycznych w punktach kontaktu borówki. Przeprowadzono symulacje uwzględniające wpływ zmiany wydatku masowego transportowanych owoców na wartości sił normalnych i stycznych. Wykazano, że zmiana wydatku masowego borówki nie powoduje przekroczenia dopuszczalnych sił stycznych i normalnych, oddziałujących pomiędzy owocami.
Źródło:
Technologia i Jakość Wyrobów; 2023, 68; 171--186
2299-7989
Pojawia się w:
Technologia i Jakość Wyrobów
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical determination of load of a model tunnel lining, taking into account different heights of soil backfill
Numeryczne określanie obciążenia modelowej obudowy tunelowej z uwzględnieniem różnych wysokości nadkładu gruntu
Autorzy:
Szklennik, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/2173987.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metoda elementów dyskretnych
obudowa walcowa
obudowa tunelu
tunel podziemny
obciążenie
nadkład gruntu
discrete element method
cylindrical tunnel lining
underground tunnel
load
soil backfill
Opis:
The paper presents an analysis of determining the load of a model tunnel lining in a noncohesive soil medium at two different heights of soil backfill above the structure. A series of simulations were performed with the flexible and rigid tunnel lining. The analysis was performed by conducting simulations with the use of an author’s program based on the discrete element method. The model previously calibrated on the basis of laboratory tests was used. The loads acting on the structure, the distribution of stresses in the surrounding soil medium and the displacements of this medium in the vicinity of the structure were determined and compared. The effect of soil weight and technological load applied from the surface was taken into account. The values of the numerically obtained loads of the tunnel lining were compared with those calculated according to the classic Hewett’s method. It has been proven that in both cases the degree of cooperation between the structure and soil is significantly related to the rigidity of the structure, hence the loads determined may differ significantly from the results obtained according to classical methods. It was shown that discrete modelling allows to reflect differences in the behaviour of the soil medium resulting from different heights of soil backfill. Smaller horizontal pressure was obtained in the side zones of an excavation at a higher backfill. In addition, significantly greater intensity of vertical soil displacements over the lining were observed with a lower backfill height.
W pracy przedstawiono analizę wyznaczania obciążenia modelowej obudowy tunelowej w niespoistym ośrodku gruntowym przy różnych wysokościach nadkładu gruntu nad konstrukcja. W obu przypadkach przeprowadzono szereg symulacji przy konstrukcji obudowy wiotkiej i sztywnej. Analizy dokonano prowadząc symulacje z wykorzystaniem autorskiego programu opartego na metodzie elementów dyskretnych. Wykorzystano model skalibrowany wcześniej na podstawie badań laboratoryjnych. Określono i porównano obciążenia działające na obudowę, rozkład naprężeń w otaczającym ją ośrodku gruntowym oraz przemieszczenia tego ośrodka w otoczeniu konstrukcji. Uwzględniono działanie ciężaru gruntu oraz obciążenia technologicznego zadawanego z powierzchni. Wartości uzyskiwanych numerycznie obciążeń obudowy porównano z obliczonymi według klasycznej metody Hewetta.
Źródło:
Archives of Civil Engineering; 2022, 68, 3; 289--305
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulations of the exploitation parameters of the rotary feeder
Autorzy:
Karwat, Bolesław
Rubacha, Piotr
Stańczyk, Emil
Powiązania:
https://bibliotekanauki.pl/articles/27315596.pdf
Data publikacji:
2022
Wydawca:
STE GROUP
Tematy:
bulk materials
Discrete Element Method
exploitation characteristics rotary feeder
Opis:
The article presents the problems of determining the mass efficiency of a rotary feeder depending on the selection of design parameters of the device, such as outer diameter, number of blades and rotational speed of the rotor. The hitherto theoretical methods of calculating the feeder efficiency were presented, as well as a new method of determining the device operation parameters was proposed. For this purpose, the numerical Discrete Element Method was used, which allowed simulating the transport of limestone powder in a cell feeder with various design variants. The results of the tests showed that the above design parameters affect the instantaneous efficiency of the feeder and thus impact the distribution of the dosed material during the operation of the device. Depending on the design solution, the simulation results gave information on the fill factor of the feeders. The study showed a significant potential of DEM simulation in the design of circular feeders intended for dosing bulk materials.
Źródło:
Management Systems in Production Engineering; 2022, 4 (30); Bibliogr. 33 poz., rys., tab.
2299-0461
Pojawia się w:
Management Systems in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Symulacje pękania materiałów o ziarnistej strukturze mikroskopowej : pierwsze uwagi
Numerical simulation of breaking materials with a granular micro-structure : first results
Autorzy:
Dębski, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/2175590.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwa Geofizyczne
Tematy:
symulacje numeryczne
Metoda Elementów Dyskretnych
pękanie ciał stałych
materiały ziarniste
zniszczenie przez rozciąganie
numerical simulations
Discrete Element Method
solid material fragmentation
granular media
tensional fracturing
Opis:
Proces pękania i fragmentacji ciał stałych jest zjawiskiem niezwykle powszechnym, a równocześnie niezwykle skomplikowanym. W zakresie zainteresowania geofizyki manifestuje się on najczęściej w postaci trzęsień ziemi i pęknięć lodowców. Dotychczasowe próby jakościowego zrozumienia tych naturalnych procesów nie dały w pełni zadowalających wyników. Ciągle nie rozumiemy wielu aspektów fizycznych tych procesów, a w konsekwencji nie można w stanie ich przewidywać z akceptowalną wiarygodnością. Losowość trzęsień ziemi i zjawisk lodowcowych znacząco ogranicza możliwości ich badań eksperymentalnych. Z tego powodu istotnego znaczenia nabiera podejście komplementarne oparte na symulacjach komputerowych. W niniejszej pracy ilustrowane jest takie podejście, analizujące pękanie materiału o ziarnistej strukturze mikroskopowej w procesie rozciągania. Wykonane symulacje pokazały jak struktura mikroskopowa determinuje losowość procesu pękania i wpływa na takie elementy procesu jak lokalizacja obszarów o zwiększonej gęstości energii kinetycznej, a więc powstawanie centrów nukleacji pęknięcia materiału.
Fragmentation of solid materials is a very common and simultaneously very complex physical process. From geophysical point of view the most interesting examples of such processes are earthquakes and glacial processes like icequakes. In spite of a huge effort of analyzing them these processes are still poorly understood for many reasons. One of them is their stochasticity. For these reasons more important become numerical simulations which allow to cast some light on physical mechanism leading to nucleation, development and finally arresting earthquakes or glacial breaking processes. In this paper we illustrate advantages of such approach analyzing a tensional breaking process of macroscopically homogeneous material of granular microstructure. Our simulations have revealed how microstructure determines the fragmentation process including its stochasticity and influences creation of hotpots - regions of high concentration of kinetic energy leading finally to creation of nucleation centers.
Źródło:
Przegląd Geofizyczny; 2022, 1-2; 39--54
0033-2135
Pojawia się w:
Przegląd Geofizyczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
3D DEM simulations of basic geotechnical tests with early detection of shear localization
Autorzy:
Grabowski, Aleksander
Nitka, Michał
Powiązania:
https://bibliotekanauki.pl/articles/1845158.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
direct shear
granular material
discrete element method
localization
grain level
Opis:
This paper deals with elementary geotechnical tests: triaxial and direct shear of cohesionless sand using the discrete element method (DEM). The capabilities of the numerical DEM code are shown, with a special focus on the early phenomena appearance in localization zones. The numerical tests were performed in 3D conditions with spherical grains. Contact moments law was introduced due to simulate not perfectly round sand grains. The influence of different physical parameters was studied, e.g. initial density or confining pressure. The sieve curve corresponded to the Karlsruhe sand [1]; however, in some tests, it was linearly scaled. Special attention was laid on the behaviour of the sand grains inside localization, e.g. rotation, porosity, fluctuations, etc. and forces redistribution. Emphasis was given on the pre-failure regime and early localization predictors.
Źródło:
Studia Geotechnica et Mechanica; 2021, 43, 1; 48-64
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptation of the machine to the new geological conditions – excavation unit redesign and optimization
Autorzy:
Andruszko, Jakub
Moczko, Przemyslaw
Pietrusiak, Damian
Powiązania:
https://bibliotekanauki.pl/articles/2128171.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dredger
rigid body dynamics
3D scanning
discrete element method
finite element method
pogłębiarka
dynamika ciała sztywnego
skanowanie 3D
metoda elementów dyskretnych
metoda elementów skończonych
Opis:
The paper presents and sums up the research and technical aspects of the modernization of the cutting tool of the dredger. Improper adjustment of the cutting elements not adjusted to the characteristics of excavated material is not an uncommon situation, causing versatile geological conditions. Relocation of the machines from one pit to another may result in the significant influence on the excavation process (wear, output, etc.). Common practice is the field try and error approach to obtain desired machine performance. In the paper authors present the approach with aid of cutting-edge technologies. Coupled DEM and kinematic simulations supported by the reverse engineering technologies of laser scanning were the fundamental drivers for final adjustments of the cutting tool at its present operational conditions.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; e137122, 1--9
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adaptation of the machine to the new geological conditions – excavation unit redesign and optimization
Autorzy:
Andruszko, Jakub
Moczko, Przemyslaw
Pietrusiak, Damian
Powiązania:
https://bibliotekanauki.pl/articles/2173623.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dredger
rigid body dynamics
3D scanning
discrete element method
finite element method
pogłębiarka
dynamika ciała sztywnego
skanowanie 3D
metoda elementów dyskretnych
metoda elementów skończonych
Opis:
The paper presents and sums up the research and technical aspects of the modernization of the cutting tool of the dredger. Improper adjustment of the cutting elements not adjusted to the characteristics of excavated material is not an uncommon situation, causing versatile geological conditions. Relocation of the machines from one pit to another may result in the significant influence on the excavation process (wear, output, etc.). Common practice is the field try and error approach to obtain desired machine performance. In the paper authors present the approach with aid of cutting-edge technologies. Coupled DEM and kinematic simulations supported by the reverse engineering technologies of laser scanning were the fundamental drivers for final adjustments of the cutting tool at its present operational conditions.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; art. no. e137122
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative FE-studies of interface behavior of granular Cosserat materials under constant pressure and constant volume conditions
Autorzy:
Ebrahimian, B.
Alsaleh, M. I.
Kahbasi, A.
Powiązania:
https://bibliotekanauki.pl/articles/38629565.pdf
Data publikacji:
2021
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
interface shearing
wall roughness
constant pressure
constant volume
dilatancy constraint
Cosserat FE model
discrete element method (DEM)
Opis:
This article shows the outcomes of a systematic series of finite element (FE) calculations relevant to the shear behavior of a particulate-continuum interface system under different normal boundary conditions. In this respect, shearing of a thin and long granular Cosserat layer in the vicinity of a rigid moving wall with varied surface roughness values is analyzed under constant normal pressure and constant volume conditions. The material behavior is defined with a special elasto-plastic Cosserat model, taking into account micro-rotation, micro-curvature, couple stress, and mean particle size. The interaction between the layer of boundary particles and the surface roughness of the adjoining bottom wall is modeled by the rotation resistance of particles along the wall surface. Herein, the coupled effects of normal confining constraints imposed on the layer and the surface roughness of the bottom wall, are considered on the response of granular material under shearing. The influences of pressure level and initial void ratio are explored as well. Numerical results demonstrate that the dilatancy constraint prescribed to the interface plane in the normal direction, and the wall roughness have visible influences on the interface shear resistance as well as the deformation field formed within the layer. After large shearing, the width of the localized zone along the wall does not necessarily depend on the normal confining constraint and the applied pressure level. However, the localized zone characteristics and the interface shear response are mainly affected by the initial void ratio of the material. In addition to FE analyses, DEM-based simulations are also performed to investigate the micro-mechanical response of granular medium adjacent to a wall under shearing. FE predictions are qualitatively compared with DEM results, and reasonable agreement is observed.
Źródło:
Archives of Mechanics; 2021, 73, 5-6; 421-470
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 63

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