scholarly journals The numerical simulation of FOPS and ROPS tests using LS-DYNA

Mechanika ◽  
2019 ◽  
Vol 25 (5) ◽  
pp. 383-390
Author(s):  
Grzegorz Kokot ◽  
Witold Ogierman
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Numerical Simulations ◽  
Design Process ◽  
Numerical Models ◽  
Finite Element Simulations ◽  
Working Environment ◽  
International Code ◽  
Protective Structure ◽  
Discrete Finite Element

The paper presents design process and numerical simulations of safety tests of the operator's protective structure of earth-moving machinery. It is connected with international code requirements according to design the protective structure of machines in the case of working environment with a danger of falling objects or situation of rolling-over. The discrete finite element numerical models and results of numerical simulation of codes required tests are presented. All finite element simulations were done using LS-DYNA software.

scholarly journals Solutions for increasing the quality of hydro-technical building elements obtained by numerical simulation

2019 ◽  
Vol 85 ◽  
pp. 02011
Author(s):  
Alexandru Fodorean ◽  
Adrian Cureu ◽  
Oana Giurgiu ◽  
Dan Opruţa
Keyword(s):  
Waste Water ◽  
Numerical Simulation ◽  
Wastewater Treatment ◽  
Numerical Simulations ◽  
Numerical Models ◽  
Waste Water Treatment ◽  
Sewage Treatment ◽  
Treatment Plant ◽  
Design Phase

Sewage treatment remains a delicate subject and requires technical improvements to increase the efficiency of the systems responsible for the treatment. Numerical simulations are also a very useful tool, especially if they are used during the design phase. Thus, the paper aims to present the results obtained by CFD numerical simulations in the case of an important element within an existing wastewater treatment plant, namely the waste water treatment well, thus obtaining constructive solutions of a better functionally to the designed version. Through these, the work demonstrates the necessity of analyzes with CFD methods during design of the main elements of hydrotechnical constructions, but also the necessity of adjusting the numerical models with results obtained from experiments, measurements. The results show that the modifications described in the paper would bring significant improvements in waste disposal.

scholarly journals Accounting for Tube Hematocrit in Modeling of Blood Flow in Cerebral Capillary Networks

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Nikolai D. Botkin ◽  
Andrey E. Kovtanyuk ◽  
Varvara L. Turova ◽  
Irina N. Sidorenko ◽  
Renée Lampe
Keyword(s):  
Finite Element ◽  
Blood Flow ◽  
Numerical Simulations ◽  
Hydraulic Resistance ◽  
Analytic Formula ◽  
Finite Element Simulations ◽  
Hematocrit Level ◽  
Capillary Networks ◽  
Cerebral Capillary ◽  
Flow Through

The aim of this paper consists in the derivation of an analytic formula for the hydraulic resistance of capillaries, taking into account the tube hematocrit level. The consistency of the derived formula is verified using Finite Element simulations. Such an effective formula allows for assigning resistances, depending on the hematocrit level, to the edges of networks modeling biological capillary systems, which extends our earlier models of blood flow through large capillary networks. Numerical simulations conducted for large capillary networks with random topologies demonstrate the importance of accounting for the hematocrit level for obtaining consistent results.

Effects of Materials on Formation of Double-Layered Liners Shaped Charges

2009 ◽  
Vol 79-82 ◽  
pp. 1277-1280
Author(s):  
Yu Zheng ◽  
Xiao Ming Wang ◽  
Wen Bin Li ◽  
Wen Jin Yao
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Numerical Simulations ◽  
Double Layer ◽  
Two Dimensional ◽  
Materials Properties ◽  
X Ray ◽  
Dimensional Finite Element ◽  
Simulation Results ◽  
Good Agreement

In order to study the effects of liner materials on the formation of Shaped Charges with Double Layer Liners (SCDLL) into tandem Explosively Formed Projectile (EFP), the formation mechanism of DLSCL was studied. Utilizing two-dimensional finite element dynamic code AUTODYN, the numerical simulations on the mechanical phenomenon of SCDLL forming into tandem EFP were carried out. X-ray pictures were obtained after Experiments on SCDLL. Comparisons between experimental results and numerical simulation results have good agreement. It can be concluded from the results that the materials properties and configurations of both liners are crucial to the formation of tandem EFP.

Different Approaches to Numerical Simulations of Prestressed Concrete Structural Elements

2014 ◽  
Vol 621 ◽  
pp. 148-153 ◽  
Author(s):  
Filip Hokes
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Numerical Simulations ◽  
Prestressed Concrete ◽  
Main Part ◽  
Structural Elements ◽  
Computational System ◽  
Element Level ◽  
Comparison Of The Results ◽  
Concrete Elements

The topic of this paper is the description of different approaches to numerical simulation of prestressed concrete in computational system ANSYS 14.5. Due to increasing popularity of the numerical simulations, the paper aims to divide and describe simple methods and related aspects of modeling prestress on the finite element level. The paper contains three main part: the analytical solution, the numerical solution and the final comparison of the results. The obtained numerical results proved applicability of FEA for solving problems of prestressed concrete elements.

Numerical Simulations of Pressurized Elbow under Reversed In-Plane Bending

2013 ◽  
Vol 785-786 ◽  
pp. 16-19 ◽  
Author(s):  
Xiao Hui Chen ◽  
Xu Chen
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Cyclic Loading ◽  
Numerical Simulations ◽  
Prediction Accuracy ◽  
Finite Element Program ◽  
User Subroutine ◽  
Element Program ◽  
Fortran Language ◽  
Plane Bending

The paper compares numerical simulation with experimental results of pressurized elbow piping subjected to reversed in-plane bending in elastoplastic domain. The modified AbdelKarim-Ohno model is implemented into finite element program ANSYS by writing own user subroutine in FORTRAN language. The modified AbdelKarim-Ohno model may improve the prediction accuracy of ratcheting behavior of pressurized elbow under cyclic loading.

scholarly journals Structural analysis by interval approach

2008 ◽  
pp. 869-880
Author(s):  
Franck Massa ◽  
Karine Mourier-Ruffin ◽  
Bertrand Lallemand ◽  
Thierry Tison
Keyword(s):  
Sensitivity Analysis ◽  
Finite Element ◽  
Structural Analysis ◽  
Design Process ◽  
Structural Design ◽  
Numerical Models ◽  
Test Case ◽  
Design Phase ◽  
Deterministic Analysis ◽  
Interval Approach

Finite element simulations are well established in industry and are an essential part of the design phase for mechanical structures. Although numerical models have become more and more complex and realistic, the results can still be relatively far from observed reality. Nowadays, use of deterministic analysis is limited due to the existence of several kinds of imperfections in the different steps of the structural design process. This paper presents a general non-probabilistic methodology that uses interval sets to propagate the imperfections. This methodology incorporates sensitivity analysis and reanalysis techniques. Numerical interval results for a test case were compared to experimental interval results to demonstrate the capabilities of the proposed methodology.

scholarly journals Magnetic transmission gear finite element simulation with iron pole hysteresis

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 105-110 ◽  
Author(s):  
Mattia Filippini ◽  
Piergiorgio Alotto ◽  
Gregor Glehn ◽  
Kay Hameyer
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Design Process ◽  
Eddy Current ◽  
Hysteretic Model ◽  
Post Processing ◽  
Element Simulation ◽  
Laminated Materials ◽  
Transmission Gear

Abstract Ferromagnetic poles in a magnetic transmission gear require particular attention during their design process. Usually, during the numerical simulation of these devices the effects of hysteresis for loss estimation are neglected and considered only during post-processing calculations. Since the literature lacks hysteresis models, this paper adopts a homogenized hysteretic model able to include eddy current and hysteresis losses in 2D laminated materials for iron poles. In this article the results related to the hysteresis in a magnetic gear are presented and compared to the non-hysteretic approach.

Numerical Simulations of Topologically Interlocked Materials Coupling DEM Methods and FEM Calculations: Comparison with Indentation Experiments

2009 ◽  
Vol 1188 ◽  
Author(s):  
Charles Brugger ◽  
Marc C. Fivel ◽  
Yves Bréchet
Keyword(s):  
Surface Roughness ◽  
Finite Element ◽  
Numerical Modeling ◽  
Discrete Element Method ◽  
Numerical Simulations ◽  
Constitutive Equations ◽  
Discrete Element ◽  
Finite Element Simulations ◽  
Compression Stress ◽  
Numerical Tool

AbstractPlanar assemblies of interlocked cubic blocs have been tested in indentation. Experiments are performed on blocs made of plaster. Influence of key parameters such as the surface roughness, the compression stress and the number of blocs are investigated. A numerical modeling is then proposed based on discrete element method. Each bloc is represented by its centre coordinates. Constitutive equations obtained by finite element simulations are introduced to model the contact between the blocs. The numerical tool is then applied to the case of indentation loading. It is found that the model reproduces all the experimental tendencies.

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