scholarly journals Experiment and Smooth Particle Hydrodynamics Simulation for the Wear Characteristics of Single Diamond Grit Scratching on Sapphire

Mechanika ◽  
2021 ◽  
Vol 27 (3) ◽  
pp. 244-250
Author(s):  
Haiyong Wu
Keyword(s):  
Stress State ◽  
Machining Process ◽  
Wear Volume ◽  
Smooth Particle Hydrodynamics ◽  
Sph Method ◽  
Workpiece Material ◽  
Diamond Grit ◽  
Wear Characteristics ◽  
Single Crystal Diamond ◽  
Particle Hydrodynamics

Abrasive single crystal diamond (SCD) grit is widely used in the machining process of sapphire. The wear of SCD grit has a significant influence on the surface quality of sapphire. In this paper, smooth particle hydrodynamics (SPH) method is employed to reveal the wear mechanism of SCD grit with Steinberg constitutive equation and Grüneisen state equation. The wear morphology, wear volume and scratching forces are measured and analyzed by combination of SPH simulations and experiments. The results show that the scratching forces fluctuate in a certain range and decrease with the increasing of workpiece material removal volume. Different degrees of cleavage and fracture appear in the front and rear of SCD grit. The shear stress and extrusion stress are the main stresses of SCD grit during the scratching process. The wear progress and wear form are mainly determined by the stress state. Different stress state leads to different wear progress of the SCD grit. The SPH method is able to reflect and illustrate the wear characteristics of SCD grit scratching on sapphire.

Computational Aspects of Submarine Slide Generated Tsunami

2014 ◽  
Vol 567 ◽  
pp. 216-221 ◽  
Author(s):  
Vo Nguyen Phu Huan ◽  
Indra Sati Hamonangan Harahap
Keyword(s):  
Incompressible Flows ◽  
Smooth Particle Hydrodynamics ◽  
Sph Method ◽  
Simulation Methodology ◽  
Submarine Slide ◽  
Tsunami Waves ◽  
Impact Forces ◽  
Particle Hydrodynamics ◽  
Computational Aspects ◽  
The Impact

Submarine landslide is the most serious threat on both local and regional scales. Tsunami phenomenon induced by submarine slide has put us on the challenge in understanding from generation mechanism to propagation and coastal inundation and mitigating the risk from submarine slide generated tsunami. This research presents the numerical simulation methodology by Smooth Particle Hydrodynamics (SPH) to investigate the impact forces of tsunami waves with the aid of physical modeling. By using parallelSPHysics, it is a source code based on the SPH method to model nearly‐incompressible flows, including various physical processes. The conclusions may potentially be taken as guideline of mitigate the risk from tsunami wave.

Influence of contact form on mechanical wear characteristics of single diamond scratching on Ta12W

2020 ◽  
Vol 72 (10) ◽  
pp. 1311-1316 ◽  
Author(s):  
Haiyong Wu ◽  
Hui Huang
Keyword(s):  
Significant Influence ◽  
Contact Area ◽  
Point Contact ◽  
Wear Volume ◽  
Contact Form ◽  
Mechanical Wear ◽  
Content Type ◽  
Wear Characteristics ◽  
Single Crystal Diamond ◽  
Point Line

Purpose Mechanical wear is the main wear form of abrasive single crystal diamond (SCD) grit. The mechanical wear of SCD grit has a significant influence on the tool life and machining quality. This paper aims to investigate the influence of grit–workpiece contact form on the mechanical wear characteristics of SCD grit. Design/methodology/approach Three different grit–workpiece contact forms, which involved point/line/face contact forms, are investigated to reveal the wear mechanism of SCD grit scratching on Ta12W. The wear morphology, wear volume and scratching forces are measured, and the stress models of different contact forms are analyzed. Findings The results show that mechanical wear mainly occurs in the grit–workpiece contact area and increases gradually from contact area to entire SCD grit. The scratching forces vary with the mechanical wear progress of SCD grits. The SCD grit with point contact form is the most prone to produce wear. The SCD grit with face contact form can remove more material volume than the other two SCD grits, and it is the most wear resistant. The stress state is closely related with the mechanical wear of SCD grit. The contact form has a significant influence on the mechanical wear of SCD grit. Originality/value The results of this study can provide a theoretical basis for the fabrication of abrasive tools.

An Adaptive Domain Decomposition Scheme for Parallel Smooth Particle Hydrodynamics Regional Weather Model

1999 ◽  
Author(s):  
Gopal N. Kumar
Keyword(s):  
Domain Decomposition ◽  
Weather Forecasting ◽  
Fluid Flows ◽  
Particle Interactions ◽  
Smooth Particle Hydrodynamics ◽  
Sph Method ◽  
Decomposition Scheme ◽  
Weather Model ◽  
Model Complex ◽  
Particle Hydrodynamics

Abstract Smooth Particle Hydrodynamics (SPH) method is a lagrangian technique used to describe and model complex fluid flows. Being a lagrangian method, it is gridless and the particles themselves carry all the information relating to the flow. By nature of its formulation, SPH method can easily incorporate complex physics of particle interactions. This makes it an attractive candidate for modeling regional weather and weather forecasting. As the SPH method deals with particle interactions in a local sense, it is good for domain decomposition. This makes SPH ideal for parallel computations. The main bottleneck arises from the need to find neighboring particles to determine local interactions. Finding neighbors is achieved by sorting the particles based on some appropriate key value. In order to have high parallel efficiency, one would have to allocate the particles equally amongst the available processors for good load balancing. This calls for an adaptive domain reallocation and for a sorting methodology that is specifically tailored for this. This paper presents a new parallel sorting scheme that guarantees that the available processors have close to equal number of particles.

ON PARTICLE WEIGHTED METHODS AND SMOOTH PARTICLE HYDRODYNAMICS

1999 ◽  
Vol 09 (02) ◽  
pp. 161-209 ◽  
Author(s):  
J. P. VILA
Keyword(s):  
Finite Difference ◽  
Boundary Conditions ◽  
Conservation Laws ◽  
Detailed Analysis ◽  
Particle Methods ◽  
Smooth Particle Hydrodynamics ◽  
Sph Method ◽  
Particle Hydrodynamics ◽  
New Ideas ◽  
Particle Approximation

This paper deal with designing of weighted particle approximation of conservation laws. New ideas concerning the use of variable smoothing length, renormalization and the use of Godunov type finite difference fluxes in particle methods are introduced and discussed in connection with standard implementation of the SPH method. A detailed analysis of boundary conditions approximation is also provided.

scholarly journals Research on numerical simulation and intelligent computing of vehicle wading driving by smooth particle hydrodynamics method

2021 ◽  
Vol 2083 (4) ◽  
pp. 042091
Author(s):  
Wei Zhang ◽  
Peigang Jiao ◽  
Qinzhong Hou
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Engineering Application ◽  
Test Site ◽  
Theoretical Research ◽  
Smooth Particle Hydrodynamics ◽  
Sph Method ◽  
Intelligent Computing ◽  
Simulation Process ◽  
Particle Hydrodynamics

Abstract The method based on Smooth Particle Hydrodynamics (SPH) is a meshless method which is widely used at present. Its advantage is that it can effectively improve the mesh distortion when finite element is used to deal with large deformation, and its particle characteristics are suitable to deal with the simulation problem of fluid. Based on the actual vehicle wading test site and the actual parameters of the vehicle, combined with the actual situation and theoretical basis, the SPH method is used for numerical simulation analysis of the vehicle wading problem. By comparing the simulation process with the actual water changes during wading, the feasibility of using SPH method in vehicle wading application is proved. In the simulation process of vehicle wading driving, under the condition of constant water level, by setting different wading speeds of vehicle, the flow law and change mechanism of water free surface are analyzed, which are of great significance in theoretical research and engineering application research.

scholarly journals Study of Numerical Simulation during ECAP Processing of Can Based on Smooth Particle Hydrodynamics

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-16
Author(s):  
Xiaofeng Niu ◽  
Chenchen Wang ◽  
K. C. Chan ◽  
Han Wang ◽  
Shidong Feng
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Equivalent Strain ◽  
Smooth Particle Hydrodynamics ◽  
The Finite Element Method ◽  
Sph Method ◽  
Ecap Processing ◽  
Particle Hydrodynamics ◽  
Simulation Results ◽  
Deformation Area

ECAP (Equal Channel Angular Pressing) is a well-known technique by which a specimen is pressed into an ECAP die to improve the mechanical properties by the nearly pure shear during the deformation process. In the ECAP processing of can, the specimen is canned with a protection material layer to avoid the cracking during deformation. At present, most simulation studies of ECAP are conducted based on the finite element method, in which large deformation can cause serious mesh distortion, resulting in a decrease of the simulation accuracy. In this study, based on SPH (Smooth Particle Hydrodynamics), we utilize the invalid particles and crack treatment techniques, building an ECAP mathematical model incorporating damage prediction, in order to simulate crack initiation and dynamic extension in the ECAP process. In simulation of pure magnesium during ECAP at room temperature using industrial pure iron as the canned material, the simulation results based on SPH method show that the plastic deformation of the pure magnesium specimen is homogeneous in both the vertical direction and the extrusion direction. The average equivalent strain value of the specimen in the major deformation area is 1.31, which is similar to the finite element simulation result in which the average equivalent strain value of the major deformation area is 1.24. From the damage perspective, the maximum damage values of the inside specimen obtained by the SPH method and the finite element method are both less than 0.16, with both values being far lower than the critical fracture accumulated damage value. The test results well match the simulation results.

Numerical Simulation Using FE-SPH Method for Concrete Slabs Penetrated and Perforated by Steel Projectiles

2011 ◽  
Vol 378-379 ◽  
pp. 143-146 ◽  
Author(s):  
Yi Bo Xiong ◽  
Jian Jie Chen ◽  
Yong Le Hu ◽  
Feng Chao Wang
Keyword(s):  
Concrete Slab ◽  
Fem Simulation ◽  
Experimental Results ◽  
Concrete Slabs ◽  
Smooth Particle Hydrodynamics ◽  
Sph Method ◽  
Particle Hydrodynamics ◽  
Element Erosion ◽  
Explicit Dynamic ◽  
Steel Projectiles

The explicit dynamic code LS-DYNA3D is used to simulate limited-thickness concrete slabs penetrated and perforated by steel projectiles with velocities from 381 m/s to 1058 m/s. The concrete slab is modeled with Smooth Particle Hydrodynamics (SPH) elements near the trajectory while Finite Element Method (FEM) elements in the others of the target, which is called FE-SPH method. The elastic-plastic model and Johnson-Holmquist concrete model are used to describe the mechanical behaviors of the projectiles and target slabs, respectively. The residual velocities computed by both FEM and FE-SPH method agree well with those of experimental results. For brittle concrete, the penetration and perforation phenomenon modeled by FE-SPH are in closer agreement with the experimental results than those modeled by FEM. Simulation of penetration and perforation by FEM require artificial element erosion set, which would lead to distortion of modeled results.

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