Review of advances in micromechanical modeling of aggregate–aggregate interactions in asphalt mixtures

2007 ◽  
Vol 34 (2) ◽  
pp. 239-252 ◽  
Author(s):  
Zhanping You ◽  
Qingli Dai
Keyword(s):  
Finite Element ◽  
Particle Interaction ◽  
Asphalt Mixture ◽  
Complex Mixture ◽  
Element Model ◽  
Laboratory Simulation ◽  
Micromechanical Modeling ◽  
Discrete Elements ◽  
Interacting Particles ◽  
Work Done

This paper presents a comprehensive review of the work done by a number of researchers on the modeling of asphalt mixture. Included are some of the earliest models such as those with non-interacting particles (models with and without geometry specified), models with particle interaction, and some new models developed in recent years. The paper focuses on the description and comparison of the most recently developed finite element network model (FENM), a clustered discrete element model (DEM), and a micromechanical finite element model (FEM) used in micromechanical modeling of asphalt mixture. These models consider the complex mixture microstructure and aggregate–aggregate interaction. These models are demonstrated and applications of the advances are provided, where virtual laboratory simulation and laboratory tests were employed. The feasibility of nanotechnology application in asphalt mixture is also briefly discussed.Key words: micromechanical modeling, micromechanics, aggregate–aggregate interaction, finite elements, discrete elements, asphalt mixture.

A Review of Numerical Study of Micro-Scale Modeling for Asphalt Mixture

2014 ◽  
Vol 716-717 ◽  
pp. 332-337
Author(s):  
Dong Feng Li ◽  
Jian Tong Zhang
Keyword(s):  
Finite Element ◽  
Numerical Method ◽  
Numerical Study ◽  
Asphalt Mixture ◽  
Element Model ◽  
Micromechanical Modeling ◽  
Microstructure Modeling ◽  
Discontinuous Displacement ◽  
Numerical Manifold ◽  
Work Done

Combining with digital image processing and numerical simulation technology, X-ray computerized tomography (CT) was used to study the microstructure of asphalt mixture for analyzing internal structure of asphalt mixture. The microstructure modeling methods of asphalt mixture can be classified as continuum-based numerical method and discontinuum-based numerical method. This paper described a review of the work done by many researchers on the modeling of asphalt mixture. The simulation methods are included finite element network model (FENM), a micromechanical finite element model (FEM), a clustered discrete element model (DEM), disturbed state concept (DSC), DDA (Discontinuous Displacement Analysis), numerical manifold method (NMM) and meshfree manifold method (MMM) that were used in micromechanical modeling of asphalt mixture.

scholarly journals Simulation of vehicle tires based on the finite element method

2020 ◽  
Vol 1 (3) ◽  
pp. 65-74
Author(s):  
S.B. Tomashevskiy ◽  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Element Model ◽  
Tire Model ◽  
The Finite Element Method ◽  
Discrete Elements ◽  
Model Based ◽  
Wheeled Vehicles ◽  
Wheel Disk ◽  
Element Method

Modeling of wheeled vehicles is one of the main directions of development and practical appli-cation of software systems based on modeling the dynamics of body systems. In this paper, a tech-nique for analyzing a vehicle tire by the finite element method under various types of loading is considered in order to identify the parameters of its simplified dynamic models. Based on the finite element method, a refined tire model is created. It takes into account the complex geometric shape of various tire parts, their material properties, as well as the contact interaction of the tire with the support. The efficiency of this model was tested, both when performing static calculations of the stress-strain state of the tire from the action of an external load, and when solving the generalized eigenvalue problem. The great influence of external load on the natural frequencies and vibration modes of the tire is confirmed. One of the possible applications of the considered method of finite element modeling of a tire is the performance of refined calculations of the dynamics of wheeled vehicles in the “Universal Mechanism” software package. There are several variants of dynamic tire models that can be used to study the dynamics of off-road wheeled vehicles, including a model based on the method of discrete elements and a model based on the method of coupled substruc-tures. A model based on the method of discrete elements represents a number of absolutely solid bodies-particles, connected to each other and by a wheel disk by a set of elastic-dissipative ele-ments. Each particle of this model has three linear degrees of freedom relative to the wheel disk. The results of calculations of the refined finite element model of the tire are necessary to identify the mass and elastic-dissipative properties of this dynamic tire model. In the model based on the method of connected substructures, the elastic displacements of the tire are represented as the sum of the admissible shapes of the elastic body. Static and natural vibration modes are used as permis-sible forms of an elastic body, calculated using a refined finite element model of the tire.

Dynamic Response Analysis for Two Typical Structures of Saturated Asphalt Pavements with 3D Finite Element Method

2011 ◽  
Vol 255-260 ◽  
pp. 3391-3396
Author(s):  
Rui Bo Ren ◽  
Li Tao Geng ◽  
Wen Yang Qi
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Asphalt Pavement ◽  
Fluid Pressure ◽  
Asphalt Mixture ◽  
Temporal Distribution ◽  
Element Model ◽  
Response Analysis ◽  
Flexible Base ◽  
Base Course

The combined effect of moisture and dynamic loading on asphalt mixtures has been recognized as one of the main causes of premature deterioration of flexible pavements. Based on porous medium theory, the asphalt mixture is regard as saturated porous material, and a three-dimensional finite element model is established to investigate dynamic response of two typical asphalt pavement structures, which are the semi-rigid asphalt pavement and the semi-rigid asphalt pavement with flexible base course. Then the spatial and temporal distribution of stress, strain and pore fluid pressure of the two structures are calculated, respectively. Analysis results show the superiority of semi-rigid asphalt pavement structure with flexible base course to the semi-rigid asphalt pavement in aspect of moisture resistance capability.

Nonlinear Finite Element Research for the Rutting of Asphalt Pavement Base on Shear Stress Analysis

2011 ◽  
Vol 97-98 ◽  
pp. 91-94
Author(s):  
Yi Dong ◽  
Miao Juan Peng ◽  
Yong Qi Ma ◽  
Wei Feng
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Stress Analysis ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Middle Layer ◽  
Element Model ◽  
Nonlinear Finite Element ◽  
Traffic Load ◽  
Pavement Base

In this paper, visco-elastic-plasticity theory is employed to establish a nonlinear finite element model of the asphalt mixture pavement. The influence of pavement structure, the ability of rutting resistance of middle layer and traffic load on shear stress distribution for asphalt pavement are discussed. The numerical results show that shear stress analysis can be used to analyze the rutting of asphalt pavement. The asphalt materials of middle layer have a great impact on rutting and shear stress. Modified asphalt is a useful middle layer material to decrease the rutting, and the hard asphalt is also an economical material to reduce rutting. Overload and overpressure easily cause pavement rutting damage. Pavement longitudinal grade is not the main reason leading to rutting at the long slope, but brake frequently in the long slope is the real cause of rutting.

Finite element method for solving asphalt mixture problem

2019 ◽  
Vol 10 (4) ◽  
pp. 569-579
Author(s):  
Wang Lijun ◽  
Li Qingbo
Keyword(s):  
Finite Element ◽  
Uniaxial Compression ◽  
Asphalt Mixture ◽  
Element Model ◽  
True Stress ◽  
Bending Test ◽  
Uniaxial Compression Test ◽  
Content Type ◽  
Freeze Thaw ◽  
Material Resources

Purpose Asphalt mixture is widely used in road engineering, and its performance research is particularly important. But the study of asphalt mixture performance needs a lot of tests, such as bending test, splitting test and so on. It also needs a lot of time and material resources. The purpose of this paper is to obtain test results through finite element numerical simulation, and show that this saves a lot of manpower and material resources. Design/methodology/approach The mechanical parameters of the material are obtained through uniaxial compression tests. The true stress and plastic strain are calculated according to nominal stress and nominal strain. A constitutive model is established. Then a finite element model of asphalt mixture is established. The numerical simulation and performance study of asphalt mixture bending test is carried out. At the same time, according to the above method, the asphalt mixture is subjected to freeze-thaw cycles and ultraviolet aging, and the mechanical parameters are obtained by a uniaxial compression test. A numerical model is established to simulate the bending characteristics of asphalt mixture after freeze-thaw cycles and ultraviolet aging. Findings A uniaxial compression test of the asphalt mixture is conducted to obtain nominal stress and nominal strain. The true stress and plastic strain are calculated and the elastic modulus is established with Poisson’s ratio as the elastic part, and the true stress and plastic strain as the plastic part. The model is constructed, the finite element model is established and the bending test is numerically simulated. The verified trend is consistent, and the method is feasible. According to the above method, the concrete is subjected to freeze-thaw cycle and ultraviolet aging, and the finite element model is established by using uniaxial compression test to obtain parameters. The bending test is simulated and the verification method is feasible. With the increase of the number of freeze-thaw cycles and the increase of UV aging time, the maximum bending strain of SBS modified asphalt mixture and matrix asphalt mixture is decreased .The low-temperature performance of SBS modified asphalt mixture is better than that of matrix asphalt mixture. Originality/value A method of simulating asphalt mixture test by finite element method numerical simulation is established. By using this method, the performance of asphalt mixture is studied, which saves a lot of manpower and material resources. At the same time, this method can be used to study the characteristics of asphalt mixture under complex conditions.

An effective cell-based smoothed finite element model for the transient responses of magneto-electro-elastic structures

2018 ◽  
Vol 29 (14) ◽  
pp. 3006-3022 ◽  
Author(s):  
Liming Zhou ◽  
Ming Li ◽  
Guangwei Meng ◽  
Hongwei Zhao
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Energy Harvester ◽  
Element Model ◽  
Discrete Elements ◽  
Transient Responses ◽  
Elastic Structures ◽  
Micro Electro Mechanical Systems ◽  
Magnetic Field Sensors ◽  
Gradient Smoothing

To overcome the over-stiffness and the imprecise magneto-electro-elastic coupling effects of finite element model, we presented a cell-based smoothed finite element model to more accurately simulate the transient responses of magneto-electro-elastic structures. In the cell-based smoothed finite element model, the gradient smoothing technique was introduced into a magneto-electro-elastic multi-physical-field finite element model. The cell-based smoothed finite element model can achieve a close-to-exact stiffness of the continuum structures which could automatically discrete elements for complicated regions more readily and thus remarkably reduced the numerical errors. In addition, the modified Wilson- θ method was presented for solving the motion equation of magneto-electro-elastic structures. Several numerical examples were investigated and exhibited that the cell-based smoothed finite element model could receive more accurate and reliable simulation results than the standard finite element model. Besides, the cell-based smoothed finite element model was employed to calculate transient responses of magneto-electro-elastic sensor and typical micro-electro-mechanical systems–based magneto-electro-elastic energy harvester. Therefore, the cell-based smoothed finite element model can be adopted to tackle the practical magneto-electro-elastic problems such as smart vibration transducers, magnetic field sensors, and energy harvester devices in intelligent magneto-electro-elastic structures systems.

scholarly journals Mechanical Characteristics of Asphalt Pavement Pothole Maintenance

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Fengjun Zhao ◽  
Yuhang Tang ◽  
Jianjun Wu ◽  
Zhi Huang ◽  
Mingyue Gao ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Void Ratio ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Element Model ◽  
Filling Material ◽  
Ansys Software ◽  
Structure Form ◽  
The Finite Element Model

Traditionally, potholes are mainly paved for maintenance, and the asphalt mixture needs to be compacted. But due to the construction quality problem, the compacting degree of asphalt mixture may not be enough and the void ratio of asphalt mixture may not meet the requirements, resulting in the premature damage of the potholes after repair. If the repair material can be prefabricated, this problem will be well solved. So, based on the structure form of the prefabricated rapid maintenance of asphalt pavement, this paper aims to determine the most unfavorable loading position in pothole repair, which was established by the ANSYS software with the finite element model. The results show that the most unfavorable loading position of tensile stress for patch materials and joint filling material is C1-1 (A2-2) and the most unfavorable loading position of shear stress for joint filling material and leveling layer is B2-1 and C1-5. Subsequently, the influences of the material modulus, size, thickness, and modulus of the old pavement material on the potholes are calculated by using the finite element model under the most unfavorable loading position.

Development of locally homogeneous finite element model for simulating the mesoscale structure of asphalt mixture

2021 ◽  
Vol 248 ◽  
pp. 106517
Author(s):  
Cong Du ◽  
Pengfei Liu ◽  
Quan Liu ◽  
Sabine Leischner ◽  
Yiren Sun ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Asphalt Mixture ◽  
Element Model ◽  
Mesoscale Structure ◽  
Locally Homogeneous

Load Capacity Finite Element and Optional Design of Scissor Platform

2013 ◽  
Vol 328 ◽  
pp. 929-932
Author(s):  
Ke Xi Guo ◽  
Jia Rong Wu ◽  
Cun Yun Pan ◽  
Bin Yin
Keyword(s):  
Finite Element ◽  
Load Capacity ◽  
Structure Optimization ◽  
Element Model ◽  
Mobile Platform ◽  
Main Function ◽  
Ansys Software ◽  
Bearing Load ◽  
Result Show ◽  
Work Done

After designing a scissor platform which main function is to standunderload, according to the load that the platform may bear, a finite element model is established, the ANSYS software is used to analysis the load on the scissor arm and mobile platform whole. The result show that the mobile platform could meet the requirements of bearing load. The maximum mises stress is taken as the objective function, the structure optimization is used on the scissor arm, so stress distribution more uniform. The work done in this article made theory basis for research and making the scissor prototype.

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