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Glass Fibre Reinforced Concrete Rebound Optimization

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Computer Modeling in Engineering & Sciences 2017年第2期113卷 203-218页

作者： Sadik Alper YILDIZEL Muhammet Ensar YIGIT Gokhan KAPLAN Karamanoglu MehmetBey UniversityFaculty of EngineeringCivil Engineering DepartmentKaraman/T URKEY Celal Bayar University Faculty of EngineeringCivil Engineering DepartmentManisa/TURKEY Kastamonu University Kastamonu Vocational SchoolKastamonu/TURKEY

Glass fibre reinforced concrete placement technique generates losses due to rebound effects of the already sprayed concrete particles.Rebounded concrete amount cause a significant difference between the initial mix design and emplaced mix compositions.Apart from the structural differences,it comes with a cost increase which was resulted by the splashed concrete amount.Many factors such as viscosity and quantity of mixes dominate this rebound amount in sprayed glass fibre reinforced concrete applications depending on production technologies and processes;however,this research focuses on the spray distance and the angle of the spray gun which mainly effects the rebound amount in glass fibre reinforced concrete production.This paper aims to understand the required angle and distance for glass fibre reinforced concrete mixes having on-site plastic viscosity values.Glass fibre reinforced mixtures were also modelled with a finite element method based software and,the analysis results were compared with production line results.Results of the analysis and on-site studies showed a decisive correlation between,discharge distance,discharge angle and the viscosity of the concrete.

关键词： Glass fibre glass fibre reinforced concrete Finite Elements Method spray distance spray Angle

A Bistable FieldModel of Cancer Dynamics

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Communications in Computational Physics 2012年第1期11卷 1-18页

作者： C.Cherubini A.Gizzi M.Bertolaso V.Tambone S.Filippi Nonlinear Physics and Mathematical Modeling Lab University Campus Bio-MedicoI-00128Via A.del Portillo 21RomeItaly International Center for Relativistic Astrophysics-I.C.R.A. University of Rome“La Sapienza”I-00185 RomeItaly Alberto Sordi Foundation-Research Institute on Aging I-00128 RomeItaly Institute of Philosophy of Scientific and Technological Activity University Campus Bio-MedicoI-00128Via A.del Portillo 21RomeItaly

Cancer spread is a dynamical process occurring not only in time but also in space which,for solid tumors at least,can be modeled quantitatively by reaction and diffusion equations with a bistable behavior:tumor cell colonization happens in a portion of tissue and propagates,but in some cases the process is stopped.Such a cancer proliferation/extintion dynamics is obtained in many mathematical models as a limit of complicated interacting biological fields.In this article we present a very basic model of cancer proliferation adopting the bistable equation for a single tumor cell dynamics.The reaction-diffusion theory is numerically and analytically studied and then extended in order to take into account dispersal effects in cancer progression in analogy with ecological models based on the porous medium equation.Possible implications of this approach for explanation and prediction of tumor development on the lines of existing studies on brain cancer progression are discussed.The potential role of continuum models in connecting the two predominant interpretative theories about cancer,once formalized in appropriatemathematical terms,is discussed。

关键词： Reaction-diffusion equations cancer modeling Finite Elements Method

Effect of the width on AZ31 sheet rolling

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Acta Metallurgica Sinica(English Letters) 2010年第2期23卷 154-160页

作者： Qingwei DAI Dingfei ZHANG Wei LAN Lin FANG Junping ZHANG College of Materials Science and Engineering Chongqing University Chongqing 400044 China National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing 400044 China Chongqing University of Science and Technology Chongqing 401331 China

A pyramid sheet has been used in experiments and three-dimensional finite element simulation to study the edge cracks and effects of width on AZ31 sheet under rolling. Results show that the edge cracks of Mg sheet comply with the Normalized Crockroft ＆ Latham theory. It can be predicted by D=-0.124＋0.09X - 0.008X2, if D ;〉 0, the edge cracks occur. The sheet shearing deformation at the edge brings about cracks. The strain rate changes periodically with different X. With initial width increases, the recrystallized grain size decreases. The finite element model has been validated by the experiment results.

关键词： Finite Elements Method Magnesium alloys Rolling Pyramid sheet Crack

An Analog of Einstein’s General Relativity Emerging from Classical finite Elasticity Theory:Analytical and Computational Issues

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Communications in Computational Physics 2013年第8期14卷 801-818页

作者： C.Cherubini S.Filippi Nonlinear Physics andMathematicalModeling Lab University Campus Bio-MedicoI-00128Via A.del Portillo 21RomeItaly International Center for Relativistic Astrophysics-I.C.R.A. University of Rome“La Sapienza”I-00185 RomeItaly

The“analogue gravity formalism”,an interdisciplinary theoretical scheme developed in the past for studying several non relativistic classical and quantum systems through effective relativistic curved space-times,is here applied to largely deformable elastic bodies described by the nonlinear theory of solid mechanics.Assuming the simplest nonlinear constitutive relation for the elastic material given by a Kirchhoff-St Venant strain-energy density function,it is possible to write for the perturbations an effective space-time metric if the deformation is purely longitudinal and depends on one spatial coordinate only.Theoretical and numerical studies of the corresponding dynamics are performed in selected cases and physical implications of the results obtained are finally discussed.

关键词： finite elasticity general relativity analogue gravity Finite Elements Method

Commercial Vehicle Cab Fatigue Life Study Based on the FEM and Tests

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Commercial Vehicle Cab Fatigue Life Study Based on the FEM a...

A COMPUTATIONAL APPROACH FOR OPTIMAL CONTROL SYSTEMS GOVERNED BY PARABOLIC VARIATIONAL INEQUALITIES

2018中国汽车工程学会年会

作者： NIE Wenwu ZHANG Lichang MAO Honghai YANG Dongsheng ZHANG Qinchao Shanghai R＆D Center of Weichai Power CO. LTD.

In this paper,commercial vehicle fatigue lift including static torsion fatigue and random fatigue was carried out using the finite element method and test method.The static cab torsion fatigue analysis based on the finite element model was carried with the MSC.Nastran software.Comparing the finite element fatigue calculation results and testing fatigue results,they are very closed and the finite element fatigue analysis can be verified by the Test We established the process of cab random fatigue lift analysis.The spot-welds built in the Hypermesh software must be converted in the FEMFAT software before the inertia relief static compulation.The static and multi-body dynamic simulation were carried with MSC.Nastran and MSC.Adams software.We took the cab random fatigue simulation with the static analysis result and the B grade,C grade,D grade road load history which was obtained from multi-body computation using the testing ground data as input The combination of finite element simulation and test can be used for predicting the cab durability and analyzing the fatigue damage of the cab.The study indicate that spot weld fatigue damage play an important role of the cab fatigue which need to be estimated accurately.

关键词： commercial vehicle cab fatigue analysis Finite Elements Method testing

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Journal of Computational Mathematics 2003年第6期21卷 815-824页

作者： N.H.Sweilam L.F.Abd-Elal Department of Mathematics Faculty of Science Cairo University Giza-EgyptDepartment of Mathematics Faculty of Science Cairo University Giza-Egypt

Iterative techniques for solving optimal control systems governed by parabolic varia-tional inequalities are presented. The techniques we use are based on linear Finite Elements Method to approximate the state equations and nonlinear conjugate gradient methods to solve the discrete optimal control problem. Convergence results and numerical experiments are presented.

关键词： Parabolic variational inequalities Finite Elements Method nonlinear conjugate gradient methods.

Calculation of Structural Characteristics Evolution during Superplastic Forming of Shells by"SPLEN-O"Application Computer Program Set

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Journal of Materials Science & Technology 2001年第1期17卷 111-112页

作者： E.Chumachenko M.Tsepin A.Tchekine O.Panina Dept.of Applied Mathematics of Moscow institute of Electronics&Mathematics MoscowRussia Dept.of Technology of Moscow State institute of Steels&Alloys(Technological University) MoscowRussia

The applications of commercial computer program set "SPLEN-O" based on Finite Elements Method (FEM) for the simulation of superplastic forming (SPF) technology of shells are described. The changes in characteristics of ultrafine-grained (UFG) structure during deformation are taken into account in function of viscosity and solving algorithm. Some examples are shown to illustrate the possibilities of FEM simulation for prediction of numerical grain-size data on different SPF stages of shells.

关键词： Structural Characteristics Finite Elements Method superplastic forming computer program FEM simulation

CRP Binding Kinetics Enhancement Using Local Narrowing into a Bent Channel: finite Element Analysis

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Engineering（科研） 2022年第1期14卷 62-75页

作者： Mohamed Bahri Imen Dermoul Marshet Getaye Mohamed Amin Elaguech Khouloud Djebbi Mounir Ben Ali Chaker Tlili Deqiang Wang Chongqing School University of Chinese Academy of Sciences Chongqing China Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences Chongqing China University of Chinese Academy of Sciences Beijing China Preparatory Institute for Engineering of Nabeul IPEIN University of Carthage Campus Universitaire Merazka Tunisia NANOMISENE Lab LR16CRMN01 Centre for Research on Microelectronics and Nanotechnology of Sousse Technopole of Sousse Sousse Tunisia University of Sousse Higher Institute of Applied Sciences and Technology of Sousse GREENS-ISSAT Cité Ettafala Sousse Tunisia

Binding kinetics enhancement of a microfluidic biosensor into a micro-channel through the application of a supplementary mechanism has received tremendous attention because of the obtained significant enhancement factor. However, biosensor’s performance enhancement using only simple channel engineering is still rarely realized. Herein, we present a novel design of a complex reactive protein (CRP) biosensor into a U-shaped channel with a sensitive membrane located in the middle of the bent zone. Various critical factors affecting the equilibrium binding time are numerically investigated. The turn geometry is then optimized when the arc length along the inner and outer radii is almost the same, which leads to locally minimizing the channel height overhead the reaction surface and improves the analyte transport towards the sensing area. The numerical studies reveal that applying a local narrowing above the reaction surface can notably enhance the trapping and the surface formation of complex antibody-antigen, thus upgrading the biosensor performance. This work puts a significant advance towards microfluidic channel engineering and the exploration of micro-flow injection experimental studies.

关键词： Finite Elements Method Binding Reaction CRP Biosensor Microfluidic System Microchannel Turn Numerical Simulation

Numerical Comparative Study on the Effective Replacement Thickness of Traditional Stone Coarse Aggregate or Steel-Slag Aggregate Mixtures in Improved Soft Fine Soils

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Journal of Surface Engineered Materials and Advanced Technology 2022年第2期12卷 23-33页

作者： Naema Ali Ali Faculty of Engineering Pharos University in Alexandria Alexandria Egypt

This study uses Steel Slag Coarse Aggregate (SSCA) as a mixture replacement, preamble material to improve soft soils, which is economic, and has good effect environment. Recently, the development and utilization of by-product, waste and recycle materials must be studied and investigated as a source of improved material for soft soils as, an economic and good effect environmental. The study analyzes effects of both replaced mixtures, (SSCA) or (TSCA) on improved soil bearing capacity and expected settlement after verifying the model. Numerical modeling of the one of real store loaded strip using, PLAXIS, 2D, strain deformation behavior to achieve field visible and measured deformations of untreated soft soil. Numerical studies were devolved to investigate geomechanics parameters improved to compare between using (SSCA) or (TSCA) as, replacement mixture. Results demonstrate that using (SSCA) improved compressibility and strength of shallow soft soil layer significantly than using (TCSA) mixture, while (SSCA) improved strip footing ultimate bearing capacity, (UBC), by 84.4% compared with increase of 20.5% when using (TCSA) mixture at the same thickness. In addition, the study highlights the effective (SSCA) replacement thickness ranges between (0.65 ~ 0.80) footing width.

关键词： Steel Slag Coarse Aggregate Soft Soil Improvement Finite Elements Method Stress-Strain Behavior