scholarly journals Regularities of stress state of unsupported working occurring in a layered massif

2019 ◽  
Vol 109 ◽  
pp. 00100
Author(s):  
Oleksii Tiutkin ◽  
Nataliia Petrosian ◽  
Anatolii Radkevych ◽  
Ahmad Alkhdour
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Elastic Modulus ◽  
Stress State ◽  
Numerical Analysis ◽  
Elastic Moduli ◽  
Element Model ◽  
Stress Components ◽  
The Matrix ◽  
Numerical Finite Element

The paper defines the regularities of stress state of unsupported working occurring in a layered massif. The relevance of the performed research is substantiated by the importance of determining the stresses of the contour of unsupported working when the elastic modulus of the matrix and the layer is varied. Since the application of analytic methods for this case is complex, we used a numerical finite element method, implemented in the SCAD. We developed a finite-element model of the above working, where the elastic moduli of the matrix and the layer varied greatly, while its position was unchanged (the layer laying in the middle of the working). The results of the numerical analysis allowed us to build the regularities of three stress components. In order to normalize cases of elastic modulus variation, a dimensionless χ -parameter is introduced which characterizes the relation between the elastic modulus of the matrix and the layer. The obtained regularities of the stress state of the χ-parameter have a functional character and allow to determine the stresses on the contour of the unsupportedworking, depending on the relation between the elastic moduli of the matrix and the layer for all possible spectrum of these parameters.

Numerical Analysis of the E-Type Diaphragm Based on ANSYS

2014 ◽  
Vol 623 ◽  
pp. 34-40
Author(s):  
Li Na Song ◽  
Jun Shao ◽  
De Quan Feng ◽  
Wei Fan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Numerical Model ◽  
Pressure Sensor ◽  
Element Model ◽  
Uniform Pressure ◽  
Sensing Element ◽  
Element Simulation ◽  
The Finite Element Model

With finite element method, the numerical model of the E-type diaphragm was built in this paper. Based on the model, we got the shear strain law of the E-type diaphragm surface under uniform pressure. Taking it as elastic element and the FBG as sensing element, we made a FBG pressure sensor and obtained the experiment result. The result fit well with finite element simulation value. It shows that the finite element model in the paper is reasonable and effective. The model can be used to design and optimize the sensor.

Numerical Analysis of Multi-Layer on the Stress Distribution in Adhesively Bonded Single Lap Aluminum Joint

2014 ◽  
Vol 1061-1062 ◽  
pp. 471-474 ◽  
Author(s):  
Min You ◽  
Ya Lan Zhao ◽  
Jian Li Li ◽  
Ying Ying Li
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Elastic Modulus ◽  
Numerical Analysis ◽  
Stress Distribution ◽  
Peak Stress ◽  
Middle Layer ◽  
Adhesively Bonded ◽  
Element Method

The effect of dual adhesives to form multi-layer on the stress distributed in adhesively bonded single lap aluminum joint was investigated using elasto-plastic finite element method (FEM). The results from the numerical simulation showed that the values of the peak stress along the bondline are influenced evidently when there is a multi-layer formed by a middle layer with higher elastic modulus adhesive and two layers with lower elastic modulus adhesive.

Finite Element Method in the Research on the Application of Contact Deformation

2012 ◽  
Vol 182-183 ◽  
pp. 1585-1589 ◽  
Author(s):  
Jia Jia Su ◽  
Jing Hu Chen
Keyword(s):  
Finite Element Method ◽  
Plastic Deformation ◽  
Finite Element ◽  
Stress State ◽  
Friction Coefficient ◽  
Contact Deformation ◽  
Matrix Surface ◽  
The Matrix ◽  
State Changes ◽  
Element Method

Wear is the matrix surface and plastic deformation as the basic factors of the phenomenon, this paper analyzed with abaqus finite element method friction deformation which stress. The results show that the stress state changes drastically with different friction coefficient and the distribution of plastic deformation regions also changes. The regions seriously damaged by friction lead to fatigue via plastic deformation, which is the main reason for material friction and then dislocation friction occurs.

scholarly journals GROUND OF PARAMETERS OF DISCRETISATION AT THE NUMERICAL ANALYSIS OF NON-CIRCULAR OUTLINE TUNNELS

2017 ◽  
pp. 20-29
Author(s):  
V. P. KUPRIY ◽  
O. L. TIUTKIN ◽  
P. YE. ZAKHARCHENKO
Keyword(s):  
Finite Element ◽  
Stress State ◽  
Numerical Analysis ◽  
Finite Element Model ◽  
Element Model ◽  
Finite Element Models ◽  
Railway Tunnel ◽  
Tunnel Support ◽  
Strain Stress ◽  
Circular Outline

Purpose. Influence on the strain-stress state of discretization of finite element model in the numerical analysis of non-circular outline tunnels is explored in the article. Methodology. For achievement of the put purpose, authors developed three finite element models of callote part at building of two-line railway tunnel. In each of models in a programmatic complex «Lira» was a concrete method of discretization area of cooperation with the temporal fastening. After creation of models, their numerical analysis with the detailed research of his results was conducted. Findings. The values of deformations and tensions of finite element models on horizontal and vertical axes, and also maximal values of moments and longitudinal forces in the temporal support are got. The comparative analysis of the got values is conducted. The graphs of conformities to the law of the indicated results from the features of discretization of two models are built. The third finite element model with the radial laying out of knots in the area of co-operation of the temporal fastening with the surrounding ground array is explored. Originality. It is set that at the numerical analysis of SSS of tunnel support of non-circular outline his results substantially depend on a form, sizes and configuration of the applied finite elements, from the sizes of calculation area of the ground massif, and also from the terms of his fixing (maximum terms). Practical value. The features of discretization and necessary sizes of calculation area of the ground massif at the design of the system are certain «support – ground massif », which provide sufficient exactness of calculation of parameters of the strain-stress state of support.

Numerical Analysis of Stress States for Graphitic Cast Iron Structures

2014 ◽  
Vol 611 ◽  
pp. 252-255 ◽  
Author(s):  
Jan Vavro ◽  
Ján Vavro ◽  
Petra Kováčiková ◽  
Peter Kopas ◽  
Marián Handrik ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cast Iron ◽  
Numerical Analysis ◽  
Ductile Cast Iron ◽  
Material Structure ◽  
The Finite Element Method ◽  
The Matrix ◽  
Stress States ◽  
Element Method

The presented work is focused on the analysis of stress distribution around the graphitic particles in microstructure of ductile cast iron with the spheroidal shape of graphite (SGCI) and grey cast iron with the lamellar shape of graphite (LGCI). The analysis was made with help of the finite element method in the software system ADINA.v.8.6.2. On the basis of the real structure, the finite element method was used for creation of the model which was subsequently used for calculation of the distribution of stress in the material structure. The input data for numerical analysis were obtained on the basis of evaluation of the structure with help of image analysis. The numerical analysis proved that graphitic particles in the matrix cause the accumulation of stress and the distribution of given stress depends on the shape of the graphitic particles.

EFFECT OF MECHANICAL PROPERTIES OF THE SUBSTRATE TISSUES ON THE DETERMINATION OF ELASTIC MODULUS OF THE SCLERA USING INDENTATION TEST

2016 ◽  
Vol 16 (07) ◽  
pp. 1650085
Author(s):  
XIUQING QIAN ◽  
KUNYA ZHANG ◽  
ZHICHENG LIU
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Elastic Modulus ◽  
Elastic Moduli ◽  
Indentation Depth ◽  
Vitreous Body ◽  
Indentation Test ◽  
Posterior Pole

The sclera is an important connective tissue that protects the sensitive layers within the eyeball. Identifying the mechanical properties of the sclera near the posterior pole is necessary to analyze the deformation of the sclera and stresses changing in the optic nerve head tissues. We propose a method to determine the mechanical properties of the sclera using dimensional analysis, finite element method and the indentation test. The elastic moduli of the sclera for different indentation depths and positions were identified. We found that the elastic moduli of the sclera varied with indentation depth. This was due to the effect of the mechanical properties of the substrate tissues inside the sclera. The elastic modulus of the choroid had the biggest effect on the determination of elastic modulus of the sclera, whereas that of the vitreous body could be ignored when the ratio of the indentation depth to the thickness of the sclera was less than 0.5. The effects of mechanical properties of the substrate tissues become more pronounced at greater indentation depths.

scholarly journals Study on Influence of Ballast Spring Modulus on Track Structure Based on Finite Element Method

2021 ◽  
Vol 4 (2) ◽  
pp. 30
Author(s):  
Tian Yang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Elastic Modulus ◽  
Element Model ◽  
Track Structure ◽  
Orbital Structure ◽  
The Finite Element Method ◽  
Supporting Force ◽  
The Finite Element Model ◽  
Element Method

The finite element method is used to simulate the orbital structure, and the finite element model of "rail - sleepers - ballast" can be established. The model of the elastic modulus of different ballast and sleeper is calculated, and the rail displacement, the sleeper stress and the fastening force are deduced. The results show that the elastic modulus of the ballast can be increased to reduce the displacement of the rail and the supporting force of the fastener, but the stress of the sleeper will be increased. When the modulus of elasticity increases, the rail displacement, small.

Distribution of Stress around the Graphitic Particles in Cast Iron Microstructure

2013 ◽  
Vol 486 ◽  
pp. 20-25 ◽  
Author(s):  
Jan Vavro ◽  
Ján Vavro ◽  
Petra Kováčiková
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cast Iron ◽  
Numerical Analysis ◽  
Ductile Cast Iron ◽  
Material Structure ◽  
The Matrix ◽  
Distribution Of Stress ◽  
The Given ◽  
Element Method

The given work is focused on the analysis of the distribution of stress around graphitic particles in microstructure of the ductile cast iron with the spheroidal shape of graphite (SGCI) and grey cast iron with the lamellar shape of graphite (LGCI). The analysis was made with help of finite element method in the software system ADINA.v.8.6.2. On the basis of the real structure, the finite element method was used for creation of the model which was subsequently used for calculation of the distribution of stress in the material structure. The input data for numerical analysis were obtained on the basis of evaluation of the structure by help of image analysis. The numerical analysis proved that the graphitic particles in the matrix cause the accumulation of the stress and the distribution of the given stress depends on the shape of the graphitic particles.

Upon Impact Numerical Modeling of Foam Materials

2017 ◽  
Vol 54 (2) ◽  
pp. 195-202
Author(s):  
Vasile Nastasescu ◽  
Silvia Marzavan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Modeling ◽  
Numerical Analysis ◽  
Numerical Methods ◽  
Boundary Conditions ◽  
General Character ◽  
Foam Material ◽  
Various Boundary Conditions ◽  
Specific Behaviour

The paper presents some theoretical and practical issues, particularly useful to users of numerical methods, especially finite element method for the behaviour modelling of the foam materials. Given the characteristics of specific behaviour of the foam materials, the requirement which has to be taken into consideration is the compression, inclusive impact with bodies more rigid then a foam material, when this is used alone or in combination with other materials in the form of composite laminated with various boundary conditions. The results and conclusions presented in this paper are the results of our investigations in the field and relates to the use of LS-Dyna program, but many observations, findings and conclusions, have a general character, valid for use of any numerical analysis by FEM programs.

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