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Determination of the Normal Contact Stiffness and Integration Time Step for the Finite Element modeling of Bristle-Surface Interaction

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Computers, materials & Continua 2018年第7期56卷 169-184页

作者： Libardo V.Vanegas-Useche magd m.abdel-wahab Graham A.Parker Facultad de Ingeniería mecánica Universidad Tecnológica de Pereira.Pereira 660003Colombia Division of Computational mechanics Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityTechnologiepark Zwijnaarde 903Zwijnaarde B-9052Belgium Faculty of Engineering and Physical Sciences University of Surrey.GuildfordUK

In finite element modeling of impact,it is necessary to define appropriate values of the normal contact stiffness,Kn,and the Integration Time Step(ITS).Because impacts are usually of very short duration,very small ITSs are ***,the selection of a suitable value of Kn is a critical issue,as the impact behavior depends dramatically on this *** this work,a number of experimental tests and finite element analyses have been performed in order to obtain an appropriate value of Kn for the interaction between a bristle of a gutter brush for road sweeping and a concrete ***,a suitable ITS is *** experiments consist of releasing a steel bristle that is placed vertically at a certain distance from a concrete surface and tracking the ***,in the finite element analyses,a beam is modeled in free fall and impacting a surface;contact and target elements are attached to the beam and the surface,*** results of the experiments and the modeling are integrated through the principle of conservation of energy,the principle of linear impulse and momentum,and Newton’s second *** results demonstrate that,for the case studied,Kn and the impact time tend to be independent of the velocity just before impact and that Kn has a very large variation,as concrete is a composite material with a rough ***,the ratio between the largest height of the bristle after impact and the initial height tends to be constant.

关键词： Brush street sweeping finite element modeling contact mechanics

Stabilization for Equal-Order Polygonal Finite Element method for High Fluid Velocity and Pressure Gradient

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Computers, materials & Continua 2020年第3期62卷 1109-1123页

作者： T.Vu-Huu C.Le-Thanh H.Nguyen-Xuan m.abdel-wahab Department of Electrical energy MetalsMechanical Constructions and SystemsFaculty of Engineering and ArchitectureGhent UniversityGhentBelgium Faculty of Civil Engineering Vietnam Maritime UniversityHai PhongVietnam Faculty of Civil Engineering and Electricity Ho Chi Minh City Open UniversityHo Chi MinhVietnam CIRTech Institute Ho Chi Minh City University of Technology(HUTECH)Ho Chi MinhVietnam Division of Computational mechanics Ton Duc Thang UniversityHo Chi MinhVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi MinhVietnam

This paper presents an adapted stabilisation method for the equal-order mixed scheme of finite elements on convex polygonal meshes to analyse the high velocity and pressure gradient of incompressible fluid flows that are governed by Stokes equations *** technique is constructed by a local pressure projection which is extremely simple,yet effective,to eliminate the poor or even non-convergence as well as the instability of equal-order mixed polygonal *** this research,some numerical examples of incompressible Stokes fluid flow that is coded and programmed by mATLAB will be presented to examine the effectiveness of the proposed stabilised method.

关键词： Polygonal finite element method fluid computation stokes equation mixed method local projection

Polygonal Finite Element for Two-Dimensional Lid-Driven Cavity Flow

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Computers, materials & Continua 2022年第3期70卷 4217-4239页

作者： T.Vu-Huu C.Le-Thanh H.Nguyen-Xuan m.abdel-wahab Faculty of Civil Engineering Vietnam Maritime University484 Lach Tray Str.Hai PhongVietnam Faculty of Civil Engineering and Electricity Ho Chi Minh City Open UniversityVietnam CIRTech Institute Ho ChiMinh City University of Technology(HUTECH)Ho Chi Minh CityVietnam Department of Architectural Engineering Sejong University209 NeungdongroGwangjinguSeoul05006Republic of Korea Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityTechnologiepark Zwijnaarde903B-9052ZwijnaardeBelgium

This paper investigates a polygonal finite element(PFE)to solve a two-dimensional(2D)incompressible steady fluid problem in a cavity *** is a well-known standard benchmark(i.e.,lid-driven cavity flow)-to evaluate the numerical methods in solving fluid problems controlled by the Navier-Stokes(N-S)equation *** approximation solutions provided in this research are based on our developed equal-order mixed PFE,called *** is an exciting development based on constructing the mixed scheme method of two equal-order discretisation spaces for both fluid pressure and velocity fields of flows and our proposed stabilisation *** this research,to handle the nonlinear problem of N-S,the Picard iteration scheme is *** proposed method’s performance and convergence are validated by several simulations coded by commercial software,i.e.,*** this research,the benchmark is executed with variousReynolds numbers up to the maximum Re=*** results then numerously compared to available sources in the literature.

关键词： Lid-driven cavity incompressible steady Navier-Stokes equations polygonal finite element method

Thermomechanical Behavior of Brake Drums Under Extreme Braking Conditions

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Computers, materials & Continua 2022年第8期72卷 2259-2273页

作者： T.Khatir m.Bouchetara K.Derrar m.Djafri S.Khatir m.abdel wahab Institute of Science and Technology University Center Salhi Ahmed NaamaAlgeria Laboratory of Gas Combustion and Environment University of Sciences and Technology of OranL.P 1505 El-MenaouerOranUSTO 31000Algeria High School of Aeronautic Techniques Dar El Beida Algeria Ho Chi minh City Open University Ho Chi Minh CityViet Nam Faculty of Engineering Van Lang UniversityHo Chi Minh CityVietnam Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityTechnologieparkZwijnaarde 903B-9052 ZwijnaardeBelgium

Braking efficiency is characterized by reduced braking time and distance,and therefore passenger safety depends on the design of the braking *** the braking of a vehicle,the braking system must dissipate the kinetic energy by transforming it into heat energy.A too high temperature can lead to an almost total loss of braking *** excessive rise in brake temperature can also cause surface cracks extending to the outside edge of the drum friction *** transfer and temperature gradient,not to forget the vehicle’s travel environment(high speed,heavy load,and steeply sloping road conditions),must thus be the essential criteria for any brake system *** aim of the present investigation is to analyze the thermal behavior of different brake drum designs during the single emergency braking of a heavy-duty vehicle on a steeply sloping *** calculation of the temperature field is performed in transient mode using a three-dimensional finite element model assuming a constant coefficient of *** this study,the influence of geometrical brake drum configurations on the thermal behavior of brake drums with two different materials in grey cast iron FG200 and aluminum alloy 356.0 reinforced with silicon carbide(SiC)particles is analyzed under extreme vehicle braking *** numerical simulation results obtained using FE software ANSYS are qualitatively compared with the results already published in the literature.

关键词： Drum brake finite element method braking energy distribution friction heat power friction heat flux transient temperature field

multi-Scale Analysis of Fretting Fatigue in Heterogeneous materials Using Computational Homogenization

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Computers, materials & Continua 2020年第1期62卷 79-97页

作者： Dimitra Papagianni magd abdel wahab Department of materials Science and Engineering University of IoanninaIoanninaGreece Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityTechnologiepark Zwijnaarde 903Zwijnaarde B-9052Belgium Division of Computational mechanics Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam

This paper deals with modeling of the phenomenon of fretting fatigue in heterogeneous materials using the multi-scale computational homogenization technique and finite element analysis(FEA).The heterogeneous material for the specimens consists of a single hole model(25% void/cell,16% void/cell and 10% void/cell)and a four-hole model(25%void/cell).Using a representative volume element(RVE),we try to produce the equivalent homogenized properties and work on a homogeneous specimen for the study of fretting ***,the fretting fatigue contact problem is performed for 3 new cases of models that consist of a homogeneous and a heterogeneous part(single hole cell)in the contact *** aim is to analyze the normal and shear stresses of these models and compare them with the results of the corresponding heterogeneous models based on the Direct Numerical Simulation(DNS)***,by comparing the computational time and%deviations,we draw conclusions about the reliability and effectiveness of the proposed method.

关键词： Fretting fatigue multi-scale analysis computational homogenization heterogeneous materials stress analysis finite element analysis

A Review on Fretting Wear mechanisms,models and Numerical Analyses

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Computers, materials & Continua 2019年第5期59卷 405-432页

作者： Tongyan Yue magd abdel wahab State Grid Xinyuan maintenance Branch BeijingChina Department of Electrical Energy MetalsMechanical Constructions&SystemsSoete LaboratoryFaculty of Engineering and ArchitectureGhent UniversityGhentBelgium Division of Computational mechanics Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam

Fretting wear is a material damage in contact surfaces due to micro relative displacement between *** causes some general problems in industrial applications,such as loosening of fasteners or sticking in components supposed to move relative to each *** wear is a complicated problem involving material properties of tribosystem and working conditions of *** to these various factors,researchers have studied the process of fretting wear by experiments and numerical modelling *** paper reviews recent literature on the numerical modelling method of fretting *** a briefly introduction on the mechanism of fretting wear,numerical models,which are critical issues for fretting wear modelling,are *** paper is concluded by highlighting possible research topics for future work.

关键词： Fretting wear wear models wear mechanisms numerical modelling

Effect of wear debris on fretting fatigue crack initiation

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Friction 2022年第6期10卷 927-943页

作者： Shengjie WANG Tongyan YUE Dagang WANG magd abdel wahab Soete Laboratory Department of Electrical EnergyMetalsMechanical Construction&SystemsFaculty of Engineering and ArchitectureGhent UniversityGhent 9052Belgium State Grid Xinyuan maintenance Branch Beijing 100000China School of mechatronic Engineering China University of Mining and TechnologyXuzhou 221116China Faculty of Engineering Van Lang UniversityHo Chi Minh City 700000Vietnam Soete Laboratory Ghent UniversityGhent 9052Belgium

Both wear and fatigue occur in fretting condition,and they interact with one another during the whole *** fatigue is commonly analysed without considering the effect of wear in partial slip regime,although wear affects the lifetime of crack *** paper investigates,for the first time,the effect of wear debris on fretting fatigue crack *** investigate the effect of debris,first fretting wear characteristics in partial slip regime are analysed for loading ***,the effect of wear on fretting fatigue crack initiation is investigated using Ruiz parameters and critical plane methods without considering the debris *** the results,we can see that loading conditions affect the wear profiles in different ***,wear has a significant effect on the fatigue in partial slip regime without considering debris especially on the crack initiation ***,considering wear debris in the analysis,its effect on critical plane parameters is *** is found that by considering the wear debris effect,the frtting fatigue crack initiation location is shifted towards the trailing *** predictions of both crack initiation location and lifetime show a good agreement with the experimental data.

关键词： fretting wear fretting fatigue critical plane Ruiz parameter debris

Fatigue crack propagation across grain boundary of Al-Cu-mg bicrystal based on crystal plasticity XFEm and cohesive zone model

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Journal of materials Science & Technology 2022年第31期126卷 275-287页

作者： Qi Zhao magd abdel wahab Yong Ling Zhiyi Liu School of materials Science and Engineering Hubei University of Automotive TechnologyShiyan 442002China Faculty of mechanical-Electrical and Computer Engineering School of Engineering and TechnologyVan Lang UniversityHo Chi Minh CityVietnam Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityTechnologiepark Zwijnaarde 903B-9052 ZwijnaardeBelgium School of materials Science and Engineering Central South UniversityChangsha 410083China

In this paper,a methodology integrating crystal plasticity(CP),the eXtended finite element method(XFEm)and the cohesive zone model(CZm)is developed for an Al-Cu-mg alloy to predict fatigue crack propagation(FCP)across grain boundary(GB)of Al-Cu-mg alloy during stageІІ.One GB model is incor-porated into FCP constitutive law to describe grain interaction at GB.A bicrystal containing GB is built up to simulate FCP behavior through L participated *** features including GB characteristic,cumulative plastic strain(CPS)distribution and crystal slipping evidence can be *** numer-ical results are compared with published experimental data to check the accuracy of *** work demonstrates that the combination of CP containing GB constitutive laws,XFEm and CZm is a promising methodology in predicting twist angle-controlled crack deflection through GBs.

关键词： Grain boundary Twist angle Crystal plasticity Extended finite element method Fatigue crack propagation Cumulative plastic strain

multiscale Analysis of the Effect of Debris on Fretting Wear Process Using a Semi-Concurrent method

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Computers, materials & Continua 2020年第1期62卷 17-35页

作者： Shengjie Wang Tongyan Yue magd abdel wahab Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityTechnologiepark Zwijnaarde 903Zwijnaarde B-9052Belgium State Grid Xinyuan maintenance Branch BeijingChina Division of Computational mechanics Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam

Fretting wear is a phenomenon,in which wear happens between two oscillatory moving contact surfaces in microscale *** this paper,the effect of debris between pad and specimen is analyzed by using a semi-concurrent multiscale ***,the macroscale fretting wear model is ***,the part with the wear profile is imported from the macroscale model to a microscale model after running in ***,an effective pad’s radius is extracted by analyzing the contact pressure in order to take into account the effect of the ***,the effective radius is up-scaled from the microscale model to the macroscale model,which is used after running in *** this way,the effect of debris is considered by changing the radius of the pad in the macroscale *** to the smaller number of elements in the microscale model compared with the macroscale model containing the debris layer,the semi-concurrent method proposed in this paper is more computationally ***,the results of this semi-concurrent method show a better agreement with experimental data,compared to the results of the model ignoring the effect of debris.

关键词： Fretting wear debris multiscale analysis semi-concurrent