scholarly journals Finite Element Analysis of Geogrid-Stabilized Unpaved Roads

2020 ◽  
Vol 12 (5) ◽  
pp. 1929
Author(s):  
Giovanni Leonardi ◽  
Dario Lo Bosco ◽  
Rocco Palamara ◽  
Federica Suraci
Keyword(s):  
Finite Element ◽  
Fem Analysis ◽  
Base Layer ◽  
Element Analysis ◽  
Unpaved Roads ◽  
Unpaved Road ◽  
Traffic Loads ◽  
Granular Fill ◽  
Wheel Loading ◽  
Granular Base

The need to increase the durability of unpaved roads and the need to improve driver comfort have led to this research: to focus more attention on the use of reinforcements for this type of road. Unpaved roads are created by using an unbound granular base layer placed on compacted cohesive soils. When the subgrade is weak, due to its poor consistency and high compressibility, generally, a geosynthetic reinforcement (geogrid and/or geotextile) is placed over the subgrade, followed by a compacted granular fill layer. The use of geosynthetics can produce several benefits, such as draining, reinforcement, filtering, separation, and proofing. This paper aims to present a numerical investigation using 3-D Finite Element Modeling (FEM) to analyze the improvement, in terms of the rutting reduction of an unpaved road system, reinforced by a geogrid, under repeated traffic loads. 3-D FEM analysis was carried out on two unpaved road sections, one reinforced and the other unreinforced, with both subjected to an impulsive wheel loading. It can be concluded that a significant improvement in pavement behavior is obtained by placing a geogrid layer at the base–subgrade interface. In fact, the obtained results show that geogrid reinforcement can provide a relevant contribution to the reduction of permanent deformations.

Method for Tensile Measurement of Stud-Less Mooring Chain

2013 ◽  
Vol 718-720 ◽  
pp. 703-708 ◽  
Author(s):  
Yu Du ◽  
Wen Hua Wu ◽  
Qian Jin Yue
Keyword(s):  
Finite Element ◽  
Deformation Characteristic ◽  
Fem Analysis ◽  
Ansys Software ◽  
Mooring Lines ◽  
Element Analysis ◽  
Present Measurement ◽  
Assessment Design ◽  
Shape Characteristics ◽  
Mooring Chain

Tension of mooring chain is the principle characteristic for mooring system. Tensile value which derived from on-site mooring lines could be used for risk assessment, design evaluation etc. It is hard to obtain underwater tension of mooring chain by traditional method, such as strain gauge, FBG, etc. A new tensile measure method is present based on finite element analysis and shape characteristics of stud-less mooring chain. At first, deformation of stud-less mooring chains is analyzed by finite element method and Ansys software. Then, a design of tension-meter is developed on the basis of the deformation characteristic due to the above FEM analysis. Finally, a model calibrate is designed and tested to prove feasibility of present measurement method.

Two-Dimensional Finite Element Analysis of Laboratory Seawall Model

2014 ◽  
Vol 580-583 ◽  
pp. 2134-2140
Author(s):  
Jian Zhang ◽  
Jian Feng Zhai ◽  
Xian Mei Wang ◽  
Jie Chen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Numerical Analysis ◽  
Numerical Results ◽  
Experimental Results ◽  
Base Layer ◽  
Two Dimensional ◽  
Element Analysis ◽  
Cemented Sand ◽  
Dimensional Finite Element

Two-Dimensional finite element analysis was used to investigate the performance of seawall construction over weak subgrade soil using artificial base layer material consisted of cemented sand cushion comprising geosynthetics materials. Two types of base layer materials pure sand and cemented sand comprising husk rich ash and two types of geosynthetics materials geogrid and geotextile were used. Constitutive models were used to represent different materials in numerical analysis. The competence of two-dimensional numerical analysis was compared with experimental results. Numerical results showed a superior harmony with the experimental results. Finite element analysis model proved to be a great tool to determine the parameters that are difficult to measure in laboratory experiments. In addition, finite element analysis has the benefit of cost and time saving when compared to experimental investigation work. Numerical results showed strain induced in geosynthetics eliminated beyond a distance approximately equal six times of footing width.

A Determination of Material Properties of Flexible Structures Using EMA and FEM Analysis

2014 ◽  
Vol 693 ◽  
pp. 293-298 ◽  
Author(s):  
Rastislav Duris
Keyword(s):  
Finite Element ◽  
Material Properties ◽  
Low Cost ◽  
Flexible Structures ◽  
Fem Analysis ◽  
Element Analysis ◽  
Structural Dynamic ◽  
Vibration Data ◽  
Complex Interactions ◽  
Applied Forces

Dynamic behavior of mechanical structures results from complex interactions between applied forces and the stiffness properties of the structure. Currently, many problems of structural dynamic analysis are solved using Finite Element Method (FEM). However, in recent years, the implementation of the Fast Fourier Transform (FFT) in low cost computer-based signal analyzers has provided a powerful tool for acquisition and analysis of vibration data. This article discusses combination of two approaches to structural dynamics testing; the experimental part which is referred to as Experimental Modal Analysis (EMA), respectively the analytical part, which is realized by Finite Element Analysis (FEA). Main goal of the paper is calculation of material properties from experimentally determined modal frequencies.

FINITE ELEMENT ANALYSIS OF A DEVICE FOR ALVEOLAR OSTEOGENIC DISTRACTION IN HUMAN MANDIBLE

2015 ◽  
Vol 27 (04) ◽  
pp. 1550034
Author(s):  
M. Cerrolaza ◽  
W. Carrero ◽  
J. Cedeño ◽  
L. Valencia
Keyword(s):  
Finite Element ◽  
Alveolar Bone ◽  
Involuntary Movement ◽  
Fem Analysis ◽  
Base Plate ◽  
Element Model ◽  
Critical Conditions ◽  
Element Analysis ◽  
Bone Deficiency ◽  
Bone Segment

Distractor devices are implanted temporarily in the bony structure in order to regenerate the bone tissue required and then be removed from the distraction site at the end of the consolidation period of callus. In this research, an osteogenic alveolar distractor (OAD) to deal with jaw bone deficiency in the alveolar area is proposed and described in this study. It addresses the FEM analysis of the proposed model of an OAD under physiological loading after the implantation. A finite element model subjected to physiological load exerted by the voluntary protrusion of the tongue on the alveolar distractor was analyzed and developed. The applied biological loads were the forces generated by the involuntary movement of the tongue against the distal end of the assembly. Both of them act on the head of the distractor screw, in the same direction but in opposite directions. The distraction device has been simulated on the alveolar bone, taking into account the most critical conditions that may occur during the distraction osteogenesis. The alveolar distractor proposed has a geometry that allows, by using only two intra-cortical screws, the attachment of the base plate to the alveolar bone without sacrificing a large periosteum area of the periosteum, which is primarily responsible for blood supply and nutrient source to the bone segment being distracted. The resulting stresses were lower than those corresponding to the resistance threshold in the bone.

FEM Analysis on Creep Deformation and Axial Bolt Force Change in Threaded Fasteners at Elevated Temperature

2016 ◽  
Author(s):  
Yuya Omiya ◽  
Tadatoshi Watanabe ◽  
Masahiro Fujii ◽  
Haruka Yamamoto
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Elevated Temperature ◽  
Creep Deformation ◽  
Fem Analysis ◽  
Screw Thread ◽  
Element Analysis ◽  
Threaded Fasteners ◽  
The Finite Element Analysis

In this study, the creep deformation in the threaded joint are discussed using a finite element method, and evaluated the influence of the dimensions of bolt and clamped parts. The stress and creep strain distributions are calculated using the Finite Element Analysis. The occurrence and the propagation of the creep deformation and influence of the creep deformation on the axial bolt force were discussed. It was found that the creep deformation occurred at the bearing surfaces and the engagement screw thread mainly at the elevated temperature. The creep deformation was a cause of the reduction in axial bolt force.

Finite Element Analysis of Earthquake Resistance Behaviors of T-Shaped Concrete-Filled Rectangular Composite Steel Tubular Columns

2014 ◽  
Vol 501-504 ◽  
pp. 1633-1638
Author(s):  
Jun Huang ◽  
Yi Chao Zhang ◽  
Shao Bin Dai
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Bearing Capacity ◽  
Fem Analysis ◽  
Nonlinear Finite Element ◽  
Earthquake Resistance ◽  
Element Analysis ◽  
Tubular Columns ◽  
Finite Element Software ◽  
Composite Steel

By using finite element software ABAQUS, the nonlinear finite element analysis of earthquake resistance behavior of T-shaped concrete-filled rectangular composite steel tubular columns is carried out, furthermore, the analysis results and the corresponding experiment results are compared. The results indicate that the calculated value of ultimate bearing capacity is less than the experimental value, and the results of FEM analysis can match the experiment results better, and thus, it can better reflect the earthquake resistance behaviors of the specimens.

scholarly journals Optimum location of geogrid reinforcement in unpaved road

2017 ◽  
Vol 54 (7) ◽  
pp. 1047-1054 ◽  
Author(s):  
S. Hamed Mousavi ◽  
Mohammed A. Gabr ◽  
Roy H. Borden
Keyword(s):  
Finite Element ◽  
Surface Deformation ◽  
Three Dimensional ◽  
Optimum Location ◽  
Element Analysis ◽  
Unpaved Road ◽  
Road Section ◽  
Base Course ◽  
Three Dimensional Finite Element ◽  
Loaded Area

This study evaluated the optimum location of a reinforcement layer to maximize the efficiency of the reinforcement inclusion in an unpaved road section. The analyses are used to investigate the optimum location of the reinforcement layer within the aggregate base course (ABC) layer, and provide a possible reason for the improvement in performance. A series of three-dimensional finite element method analyses was performed, and the strain and stress response of a reinforced unpaved road section with two different ABC thicknesses was evaluated. The analyses were conducted under cyclic loading with three different radii of the circular loaded area. The embedded depth of reinforcement was varied within the ABC layer. Results indicate that regardless of ABC layer thickness, the surface deformation is minimized when the reinforcement is embedded at a depth equal to half of the radius of the loaded area (D = 0.5r). A higher tension force is mobilized in the reinforcement element when it is placed at D = 0.5r. It is also shown that the required thickness of ABC is reduced when the reinforcement layer is implemented at the depth at which the maximum vertical strain occurs. Depending on the thickness of the ABC layer, the finite element analysis results indicate that the reinforcement layer could be ineffectual if it is placed at the interface between the ABC and the subgrade layer as is traditionally the case.

Study on Design of Metallic Sandwish Structure and its Mechanical and Thermal Properties

2013 ◽  
Vol 461 ◽  
pp. 85-94
Author(s):  
Rui Qiao ◽  
Ce Guo ◽  
Chun Sheng Zhu ◽  
Zhen Dong Dai ◽  
Xiao Ting Jiang
Keyword(s):  
Finite Element ◽  
Compressive Force ◽  
Fem Analysis ◽  
Displacement Curve ◽  
Mechanical And Thermal Properties ◽  
Stainless Steel Sheet ◽  
Metallic Structure ◽  
Element Analysis ◽  
Static Experiment ◽  
Force Displacement

Based on the microstructure of the beetles elytras cross-section, a bio-inspired metallic structure was designed. The mechanical property and the thermal property of the structure were analyzed with finite element method, and the compressive force-displacement curve and temperature distribution the structure were obtained, respectively. At the same time, the bio-inspired metallic structure sample was made with the material of the stainless steel sheet, and the quasi-static experiment and the thermal experiment of the structure were carried out. Comparing the experimental results with the FEM analysis, the results proved both the accuracy and reliability of FEM. Key words:beetle elytra;microstructure;bio-inspired structure; finite element analysis

FEM Analysis of a 0.50 Caliber Rifle Barrel

2010 ◽  
Author(s):  
Gary A. Anderson ◽  
Corey M. Lanoue ◽  
Fereidoon Delfanian
Keyword(s):  
Plastic Deformation ◽  
Finite Element ◽  
Leading Edge ◽  
Fem Analysis ◽  
High Strength ◽  
Element Model ◽  
Pressure Profile ◽  
Strength Analysis ◽  
Analysis Tool ◽  
Element Analysis

In order to ensure rifle barrels have the features of high strength, durability, and light weight, the strength analysis of the barrels under hot temperatures and pressures is very important in the design. A finite element model incorporating the plastic deformation of a typical 0.50 caliber rifle barrel is constructed to determine the stresses caused by the mechanical loads and plastic deformation. According to the simulation results, the finite element analysis is proved to be a power analysis tool for future failure analysis of firearm barrels. The method provides a power tool for analysis of firearm barrels. The projectile was accelerated to 941.7 m/s in 1.430 ms with a pressure profile that reached a maximum of 469.3 MPa. Stresses as large as 1,410 MPa along the interior of the barrel were found where the leading edge of the projectile slides along the bore, but the largest stresses at the exterior of the barrel were found where the barrel wall is thinnest near the chamber.

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