Study on the Mutual Influence of Back-to-back Geogrid Reinforced Soil Wall by Finite Element Method

2020 ◽  
Vol 29 (7) ◽  
Author(s):  
Guangqing Yang ◽  
Yunfei Zhao ◽  
He Wang ◽  
Zhijie Wang ◽  
Weichao Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mutual Influence ◽  
Reinforced Soil ◽  
Reinforced Soil Wall ◽  
Element Method

Micromechanical analysis of loop-formed fiber-reinforced soil composite

2013 ◽  
Vol 44 (3) ◽  
pp. 418-433
Author(s):  
Seyed Mahdi Hejazi ◽  
Seyed Mahdi Abtahi ◽  
Mohammad Sheikhzadeh ◽  
Amir Mostashfi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Reinforced Soil ◽  
Soil Reinforcement ◽  
Fiber Reinforced ◽  
Shear Tests ◽  
Direct Shear Tests ◽  
Proposed Model ◽  
Fiber Reinforced Soil ◽  
Element Method

In this research, loop-formed fiber is introduced as a novel reinforcement method of soil composites instead of using ordinary fibers. In order to investigate the materials' mechanical properties, the shear behavior of both fiber and looped-fiber-reinforced soil composites was analyzed by micromechanical method (finite element method) and a set of direct shear tests. The results indicate that the looped-fiber soil composite exhibits greater failure strain energy compared with fiber-reinforced soil composite at the same fiber orientation in the substrate. Furthermore, the proposed model demonstrated two major reinforcing components: “the fiber effect” and “the loop effect.” The latter effect is the key benefit and the main advantage of using looped fibers over ordinary fibers in soil reinforcement. Altogether, there is a close agreement between finite element method outputs and experimental results, suggestive of a novel technical textile material that could potentially be used in geotechnical engineering.

scholarly journals Algorithms for Numerical Solution to the Problem of Diffusion in Nanoporous Media

2020 ◽  
pp. 44-52
Author(s):  
N.A. Vareniuk ◽  
N.I. Tukalevska
Keyword(s):  
Mathematical Modeling ◽  
Finite Element Method ◽  
Mass Transfer ◽  
Finite Element ◽  
Numerical Solution ◽  
Heterogeneous Media ◽  
Mutual Influence ◽  
Single Substance ◽  
Nonstationary Diffusion ◽  
Element Method

Introduction. Mathematical modeling of mass transfer in heterogeneous media of microporous structure and construction of solutions to the corresponding problems of mass transfer was considered by many authors [1–9, etc.]. In [6, 7] authors proposed a methodology for modeling mass transfer systems and parameter identification in nanoporous particle media (diffusion, adsorption, competitive diffusion of gases, filtration consolidation), which are described by non-classical boundary and initial-boundary value problems taking into account the mutual influence of micro- and macro-transfer flows, heteroporosity, the structure of microporous particles, multicomponent and other factors. In [8, 9] for a mathematical model of nonstationary diffusion of a single substance in a nanoporous medium described in [2] in the form of a multi-scale differential mathematical problem, the classical problems in the weak formulation were obtained. In this paper, algorithms for solving the above mathematical problems are constructed by using the finite element method. The results of the numerical solution of the test problem are presented. The results confirm the efficiency of the developed algorithms. The purpose is to solve a problem of nonstationary diffusion of single substance in nanoporous medium by constructing discretization algorithms using FEM quadratic basis functions. Results. Algorithms for the numerical solution of the problem of nonstationary diffusion of single substance in a nanoporous medium are proposed. Peculiarities of discretization of the region and construction of the matrix of masses, stiffness, and vector of right-hand sides when solving the problem by using FEM are described. The efficiency of the developed algorithms is confirmed by the results of solving a model example. Keywords: mathematical modeling, numerical methods, nonstationary diffusion, nanoporous medium, finite element method.

Strength and Interaction of Soil Reinforced with Three-Dimensional Elements

2007 ◽  
Vol 340-341 ◽  
pp. 1285-1290
Author(s):  
M.X. Zhang ◽  
S.L. Zhang ◽  
J.M. Peng ◽  
A.A. Javadi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Shear Strength ◽  
Three Dimensional ◽  
Reinforced Soil ◽  
Experimental Results ◽  
Triaxial Tests ◽  
Retaining Structure ◽  
3D Elements ◽  
Element Method

For conventional reinforced soil, the reinforcements are put horizontally in the soil. A new concept of soil reinforced with three-dimensional elements was proposed. In 3D reinforced soil, besides conventional horizontal reinforcements, some vertical and 3D reinforcements can also be laid in the soil. The triaxial tests on sand reinforced with 3D reinforcement were carried out. From the experimental results, the differences of stress-strain relationship and shear strength between horizontal reinforced sand and 3D reinforced one were analyzed. The experimental results show that 3D reinforcement not only increases its cohesion, the angle of internal friction has been increased greatly, especially with 3D elements on both sides. Based on experimental results, a retaining structure reinforced with 3D reinforcements was analyzed by the finite element method. The stress distribution and interaction between 3D elements and soil were studied. The plastic zone and stability analysis of the retaining structure reinforced with 3D reinforcements were investigated by finite element method by shear strength reduction technique.

scholarly journals Designing of the blades of aircraft propellers by the finite element method, taking into account the strength of structure

2021 ◽  
Vol 22 (1) ◽  
pp. 65-71
Author(s):  
Vladimir P. Agapov ◽  
Kurban R. Aidemirov
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Spatial Configuration ◽  
Mutual Influence ◽  
Aerodynamic Load ◽  
Geometrically Nonlinear ◽  
The Finite Element Method ◽  
Wide Range ◽  
Propeller Blades ◽  
Element Method

The blades of contemporary turboprop engines have a complex spatial configuration. They can be classified as shells. Methods for the shells calculation are well known. A number of computer programs have been created on their basis. However, these programs do not take into account the peculiarities associated with the mutual influence of deformations of the blade and the aerodynamic and inertial loads acting on it. The aim of this work is to develop a method of finite element calculation of aircraft propeller blades taking into account aeroelastic effects and to create a computer program on its basis that is available to a wide range of designers and engineers. The finite element method is used in a geometrically nonlinear formulation. As the initial one, the equilibrium equation is used, which includes a complete nonlinear stiffness matrix and takes into account both conservative and non-conservative loads. The blade of one of the serial propellers was calculated. The effect of deformations on the magnitude of the aerodynamic load and, as a result, on the stresses in the design sections was found and analyzed. The proposed technique and the program compiled on its basis can be used in the design of aircraft propeller blades.

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