Temat: SPH - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: The application of the smoothed particle hydrodynamice (SPH) method and the experimental verification of cutting of sheet metal bundles using a guillotine
Autorzy:: Gąsiorek, D.
Tematy:: SPH
cutting
guillotine; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/279281.pdf Link otwiera się w nowym oknie
Opis:: The article presents the application of the SPH method for the modeling of cutting composite bundles using a guillotine. For many years, the SPH method has been applied in the modeling of dynamic phenomena in which rapid strain and large deformations occur. The discrete model has been performed by combining the FEM and the SPH. The SPH method has only been applied for to the fragment in which the material separation during cutting appears. To verify the numerical results, experiments have been performed using a special test stand for the confirmation of the correctness of the developed model and the numerical simulations.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Brake system studies using numerical methods
Badania układów hamulcowych metodami numerycznymi
Autorzy:: Baranowski, P.
Damaziak, K.
Małachowski, J.
Tematy:: brakes
FEM modelling
SPH modelling
thermomechanics
friction
hamulce
modelowanie MES
modelowanie SPH
termomechanika
tarcie; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Powiązania:: https://bibliotekanauki.pl/articles/1366205.pdf Link otwiera się w nowym oknie
Opis:: The paper presents the examples of numerical simulations of braking systems performed in order to determine the parameters of their work. Using a typical finite element and meshless numerical methods, dynamic analyses of the brake were performed paying particular attention on the phenomenon of thermo-mechanical coupling occurring in the process of braking, as well as wear processes occurring on the surface of the linings. The article presents sequence of research steps, including hybrid modelling of braking system.
\W pracy przedstawiono przykłady symulacji numerycznych układów hamulcowych wykonanych w celu wyznaczenia parametrów ich pracy. Stosując siatkowe i bezsiatkowe metody numeryczne przeprowadzono dynamiczne analizy pracy hamulca ze zwróceniem szczególnej uwagi na zjawiska sprzężone (cieplno – mechaniczne) występujące w procesie hamowania oraz procesy zużycia zachodzące na powierzchni okładziny ciernej. W artykule przedstawiono kolejne kroki badań obejmujące modelowanie hybrydowe układu hamulcowego.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Numerical simulation of crater creating process in dynamic replacement method by smooth particle hydrodynamics
Autorzy:: Danilewicz, A.
Sikora, Z.
Tematy:: dynamic replacement method
SPH
impact soil; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/178657.pdf Link otwiera się w nowym oknie
Opis:: A theoretical base of SPH method, including the governing equations, discussion of importance of the smoothing function length, contact formulation, boundary treatment and finally utilization in hydrocode simulations are presented. An application of SPH to a real case of large penetrations (crater creating) into the soil caused by falling mass in Dynamic Replacement Method is discussed. An influence of particles spacing on method accuracy is presented. An example calculated by LS-DYNA software is discussed. Chronological development of Smooth Particle Hydrodynamics is presented. Theoretical basics of SPH method stability and consistency in SPH formulation, artificial viscosity and boundary treatment are discussed. Time integration techniques with stability conditions, SPH+FEM coupling, constitutive equation and equation of state (EOS) are presented as well.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Smoothed particle hydrodynamics versus finite element method for blast impact
Autorzy:: Jankowiak, T.
Łodygowski, T.
Tematy:: FEM
SPH
blast impact
concrete slab; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/201966.pdf Link otwiera się w nowym oknie
Opis:: The paper considers the failure study of concrete structures loaded by the pressure wave due to detonation of an explosive material. In the paper two numerical methods are used and their efficiency and accuracy are compared. There are the Smoothed Particle Hydrodynamics (SPH) and the Finite Element Method (FEM). The numerical examples take into account the dynamic behaviour of concrete slab or a structure composed of two concrete slabs subjected to the blast impact coming from one side. The influence of reinforcement in the slab (1, 2 or 3 layers) is also presented and compared with a pure concrete one. The influence of mesh density for FEM and the influence of important parameters in SPH like a smoothing length or a particle distance on the quality of the results are discussed in the paper.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Numerical Investigation of an Explosive Welding of Ti/Cu Plates Based on a Meshfree Method
Autorzy:: Mojżeszko, M.
Perzyński, K.
Sionkowski, M.
Paul, H.
Madej, Ł.
Tematy:: explosive welding
CEL
SPH
digital material representation; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/353823.pdf Link otwiera się w nowym oknie
Opis:: Development of a reliable numerical model capturing major physical mechanisms controlling explosive welding and considering properties of all process components i.e. base plate and flyer plate is the goal of the paper. To properly replicate materials behavior under these severe conditions a meshfree approach, namely Smooth Particle Hydrodynamics (SPH), was used to discretize the computational domain. The model is based on the Mie-Gruneisen shock equation of state applied to the Ti/Cu system as a case study. Examples of results in the form of velocity, equivalent stress, equivalent strain, and pressure fields are presented within the paper.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: On the SPH Approximations in ModelingWaterWaves
Autorzy:: Szmidt, K.
Tematy:: water wave
SPH modeling
consistency
kernel correction; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Powiązania:: https://bibliotekanauki.pl/articles/241299.pdf Link otwiera się w nowym oknie
Opis:: This paper presents an examination of approximation aspects of the Smoothed Particle Hydrodynamics (SPH) in modeling the water wave phenomenon. Close attention is paid on consistency of the SPH formulation and its relation with a correction technique applied to improve the method accuracy. The considerations are confined to flow fields within finite domains with a free surface and fixed solid boundaries with free slip boundary conditions. In spite of a wide application of the SPH method in fluid mechanics, the appropriate modeling of the boundaries is still not clear. For solid straight line boundaries, a natural way is to use additional (virtual, ghost) particles outside the boundary and take into account mirror reflection of associated field variables. Such a method leads to good results, except for a vicinity of solid horizontal bottoms where, because of the SPH approximations in the description of pressure, a stratification of the fluid material particles may occur. In order to illustrate the last phenomenon, some numerical tests have been made. These numerical experiments show that the solid fluid bottom attracts the material particles and thus, to prevent these particles from penetration into the bottom, a mutual exchange of positions of real and ghost particles has been used in a computation procedure.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Blast wave and suspension system interaction - numerical approach
Autorzy:: Baranowski, P.
Małachowski, J.
Tematy:: suspension system
pressure wave
SPH
ALE
FE modeling; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/247125.pdf Link otwiera się w nowym oknie
Opis:: The main aim of this paper is to present the effective example of coupled experimental and numerical tests. Moreover, a development process of a numerical model of a terrain vehicle suspension system is presented. Experimental tests were carried out on the machine Instron 8802 with an assistance of the high-speed camera Phantom v12. Obtained stress-strain curves were applied into the FE model to estimate material constants for Mooney-Rivlin constitutive rubber model and for numerical failure criterion. Geometry of the tire and other suspension elements were achieved using reverse engineering technology. Due to the fact that a tire is such a complex structure to be represented with numerical methods, it was important to develop a discrete model of tire as much similar to the real one as possible. Consequently, an exact tire cords pattern was implemented into the FE model of the tire, which was obtained by the assistance of a microscope and X-ray device. In the next step, numerical analyses were performed simulating the TNT explosion under the suspension system with a simplified motor-car body. Nonlinear dynamic simulations were carried out using the explicit LS-Dyna code, with central difference scheme with modified the time integration of the equation of motion. In order to simulate the blast wave propagation the Smoothed Particle Hydrodynamics (SPH) method and Arbitrary Lagrangian-Eulerian formulation with Jones Wilkins Lee (JWL) equation defining the explosive material were used. Finally, results from both approaches were compared.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Smoothed particle hydrodynamics simulations using graphics processing units
Autorzy:: Szewc, K.
Tematy:: fluid dynamics
CFD
particle methods
SPH
GPU calculations; Pokaż więcej
Wydawca:: Politechnika Gdańska
Powiązania:: https://bibliotekanauki.pl/articles/1954445.pdf Link otwiera się w nowym oknie
Opis:: Smoothed Particle Hydrodynamics (SPH) is a fully Lagrangian, particle-based technique for fluid-flow modeling. As a gridless method, it appears to be a natural approach to simulate multi-phase flow with complex geometries. Since SPH involves a large set of short-range particle-particle interactions, numerical implementations present a high degree of spatial data locality and a significant number of independent computations. Therefore, the numerical code can be easily written in a massively parallel manner. The main purpose of this study is to discuss the issues related to the implementation of the SPH method for computation using Graphics Processing Units (GPU). The study is supported by two-dimensional validation cases: the lid-driven cavity and oscillation of a droplet. The obtained results show a good accuracy of the method, as well as, high numerical efficiency of its GPU implementation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Simulation of Steel Armour Penetration Using the Johnson-Cook Model
Autorzy:: Wiśniewski, A.
Tomaszewski, Ł.
Tematy:: numerical simulations
AUTODYN
SPH method
Johnson-Cook constitutive model; Pokaż więcej
Wydawca:: Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Powiązania:: https://bibliotekanauki.pl/articles/403450.pdf Link otwiera się w nowym oknie
Opis:: The numerical simulations were carried out of penetration of 12.7 mm armour piercing projectile into the ARMOX 500 steel armour with the use of the AUTODYN 2D software program applying axis symmetry. The calculations were performed by means of the SPH (Smooth Particle Hydrodynamic) method. A constitutive Johnson-Cook model was used for both the armour and the projectile. The influence of discretization density of the numerical model on the residual velocity vr of the projectile, its wear and time of calculations was studied. An eight times decrease in the distance between the SPH particles in the numerical model causes an over 130 fold increase of the projectile residual velocity and a 960 fold increase in the calculation time. The examined aspects included the influence of armour thickness g and yield stress Re of the projectile material on its residual velocity and manner of the projectile and armour damage. The residual velocity of the projectile decreases together with an increase of the armour thickness and for g = 20 mm is vr = 300 m/s. Together with a decrease of the yield stress of the projectile material its residual velocity also decreases, the wear of the projectile increases, the shape and the dimensions of cross section hole in the armour also change.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Experimental Study and Numerical Simulation of Explosive Welding of Nickel Foil with Q235 Steel
Autorzy:: Xu, Mengben
Xie, Xinghua
Wang, Hanxin
Zhu, Maaolin
Tematy:: explosive welding
nickel foil
SPH simulation
mechanism of connection; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Powiązania:: https://bibliotekanauki.pl/articles/59115374.pdf Link otwiera się w nowym oknie
Opis:: In order to study the interface microstructure and formation mechanism of nickel (Ni) foil/steel Q235 (Ni/Q235) explosive composite plate, Ni/Q235 laminated composite was successfully prepared by explosive welding technology using Ni foil, Q235 steel plate as substrate and composite plate. respectively. The microstructure of the bonding interface was analyzed by SEM and EDS. The mechanical properties of the interface were tested by tensile tests. The explosive welding process was simulated by the smooth particle fluid dynamics (Smoothed Particle Hydrodynamics, SPH) numerical simulation method. The results showed that the interface of the Ni/Q235 explosive composite plate had regular wave-like bonding, and there were no defects, such as unbonding and local melting at the bonding interface. The tensile strength of the tensile specimen reached 623 MPa, and the Ni layer and the Q235 layer on either side of the tensile specimen fracture exhibited a mainly plastic fracture. The numerical simulation results were in good agreement with the experimental results, which can provide theoretical support for the study of the explosive welding preparation of Ni/Q235 double-layer composite plate and the bonding mechanism of its connection interface.
Dostawca treści:: Biblioteka Nauki

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