Creep and Dilatancy Behavior of Rock Salt around Underground Caverns

2012 ◽  
Vol 629 ◽  
pp. 418-422
Author(s):  
S. Nazary Moghadam ◽  
H. Mirzabozorg ◽  
A. Noorzad ◽  
K. Nazokkar
Keyword(s):  
Finite Element ◽  
Rock Salt ◽  
Time Dependent ◽  
Finite Element Analyses ◽  
Volume Changes ◽  
Viscoplastic Model ◽  
Dependent Behavior ◽  
Underground Caverns ◽  
Finite Element Procedure ◽  
Stress And Deformation

In the present paper, the time-dependent behavior of a salt cavern was analyzed using finite element method. A viscoplastic model considering inelastic volume changes was utilized to describe the time-dependent mechanical behavior of rock salt. The model was then implemented in a finite element procedure to analyze the stress and deformation of rock salt around an underground cavern using an axisymmetric representation. Finally, finite element analyses results were compared with those obtained by a viscoplastic model neglecting inelastic volume changes.

scholarly journals On the Structural Behavior of Progressively Mined Solution Cavities in Salt

1977 ◽  
Vol 44 (4) ◽  
pp. 565-570 ◽  
Author(s):  
A. F. Fossum
Keyword(s):  
Finite Element ◽  
Stress Field ◽  
Rock Salt ◽  
Tectonic Stress ◽  
Analysis Procedure ◽  
Time Dependent ◽  
Structural Behavior ◽  
Tectonic Stress Field ◽  
Finite Element Code ◽  
Excavation Process

The stress field and the time dependent deformation around a solution cavity in rock salt are shown to be sensitive to the details of the excavation process and to the prevailing tectonic stress field. An analysis procedure is developed whereby an incremental excavation procedure and a creep routine are incorporated simultaneously into an axisymmetric finite element code.

scholarly journals Finite Element Analysis of Structural Engineering Problems Using a Viscoplastic Model Incorporating Two Back Stresses

1995 ◽  
Vol 117 (2) ◽  
pp. 377-383 ◽  
Author(s):  
V. K. Arya ◽  
G. R. Halford
Keyword(s):  
Finite Element ◽  
Structural Engineering ◽  
Nonlinear Finite Element ◽  
Finite Element Analyses ◽  
Element Analysis ◽  
Finite Element Program ◽  
Viscoplastic Model ◽  
Engineering Problems ◽  
Element Program ◽  
Viscoplastic Models

The feasibility of a viscoplastic model incorporating two back stresses and a drag strength is investigated for performing nonlinear finite element analyses of structural engineering problems. The model has recently been put forth by Freed and Walker. The feasibility of the viscoplastic model is demonstrated for nonlinear structural analyses by implementing the model into a finite element program and performing nonlinear finite element analyses for several uniaxial and multiaxial problems. Good agreement is shown to exist between the results obtained using the finite element implementation and those obtained experimentally. The advantages of using advanced viscoplastic models for performing nonlinear finite element analyses of structural components are indicated.

The Investigation of Stress Distribution on the Tractor Clutch Finger Mechanism by Using Finite Element Method

2014 ◽  
Author(s):  
F. Karpat ◽  
O. Dogan ◽  
C. Yuce ◽  
N. Kaya ◽  
G. Cengiz
Keyword(s):  
Finite Element ◽  
Essential Element ◽  
Element Model ◽  
Agricultural Activities ◽  
Finite Element Analyses ◽  
Load Path ◽  
Farm Work ◽  
Torque Transmission ◽  
Cad Models ◽  
Stress And Deformation

In recent years, there has been an increasing demand for tractor usage for agricultural activities in the world. Tractors are an integral part of mechanization and have a crucial role to play to enhance agricultural productivity. They are used for many kinds of farm work, under various soil and field conditions. It provides agricultural activities in challenging conditions by using several farming equipment. During the operations, tractors have to efficiently transfer power from the engine to the drive wheels and PTO through a transmission. Tractor clutch is the essential element in this system. During the torque transmission, loads which occur on the clutch components cause damages. In many cases, especially PTO clutch finger mechanism is fractured under the torque transmission. In this study, finger mechanism, which used in tractor clutch PTO disc, is investigated. Finite element analyses were performed for two different thicknesses (3.5 and 4 mm) of the finger mechanism. Stress and deformation values which occur during the transfer of power in a safe manner are investigated for these thicknesses. The finger mechanism CAD models were created using CATIA V5 and then imported into ANSYS for static finite element analyses. As a result of the analyses, approximately 13% stress decreasing was observed with the increment of the 0.5 mm for the finger thicknesses. Results from the analyses provide an accurate prediction of the material yielding and load path distribution on the PTO clutch finger. To verify the analyses results prototype PTO finger mechanism was manufactured and was conducted bench tests. Consequently, a good correlation was achieved between finite element model and test results.

scholarly journals Time-dependent characteristics of two-layer functionally graded plates adhesively bonded by a viscoelastic interlayer based on Kirchhoff plate theory

Mechanika ◽  
2020 ◽  
Vol 26 (6) ◽  
pp. 478-485
Author(s):  
Zhiyuan YANG ◽  
Peng WU ◽  
Weiqing LIU
Keyword(s):  
Finite Element ◽  
Plate Theory ◽  
Functionally Graded ◽  
Time Dependent ◽  
Functionally Graded Plates ◽  
Time Step ◽  
Fine Mesh ◽  
Present Solution ◽  
Stress And Deformation ◽  
Viscoelastic Interlayer

An analytical solution is proposed to investigate the time-dependent characteristics of two-layer functionally graded plates with a viscoelastic interlayer. The elastic modulus in each graded layer varies through the thickness following an arbitrary function, and its mechanical properties are described based on the Kirchhoff theory. The Maxwell-Wiechert model is applied to simulate the viscoelastic adhesive interlayer with the neglect of memory effect. The energy equation of the system is expressed by the deformation components, which are expanded as the double trigonometric series. By virtue of variational method, the solutions of stress and deformation are determined efficiently. The comparison study indicates that the present solution matches the finite element solution well; however, the finite element method is highly time-consuming because of the fine mesh in the geometric shape and the time step. Finally, the influences of the geometry and material on the time-dependent behavior of the structure are discussed in detail.

Stress Relaxation of Cartilage Under Simple Shear and Compression: Experiments and Finite Element Analyses

2012 ◽  
Author(s):  
Chen-Yuan Chung ◽  
Mostafa Motavalli ◽  
Joseph M. Mansour
Keyword(s):  
Extracellular Matrix ◽  
Finite Element ◽  
Articular Cartilage ◽  
Simple Shear ◽  
Type Ii Collagen ◽  
Biomechanical Properties ◽  
Type Ii ◽  
Finite Element Analyses ◽  
Stress And Deformation ◽  
Engineered Cartilage

Articular cartilage is a hydrated connective tissue consisting of a relatively small number of chondrocytes surrounded by a saturated extracellular matrix comprised mainly of type-II collagen fibrils and proteoglycans. As a deformable fluid saturated material, cartilage is most often modeled using biphasic or poroelastic theories [1,2]. The ultimate goal of this work is to evaluate biomechanical properties of native and tissue engineered cartilage under combined compression and shear. The purpose of this investigation was to determine stress and deformation fields in cartilage under compression and simple shear and relate these to measured results.

Thermo-Viscoelastic Response of Graphite/Epoxy Composites

1988 ◽  
Vol 110 (2) ◽  
pp. 113-116 ◽  
Author(s):  
Kuen Y. Lin ◽  
I. H. Hwang
Keyword(s):  
Finite Element ◽  
Composite Materials ◽  
Time Dependent ◽  
Epoxy Composites ◽  
Element Formulation ◽  
Viscoelastic Response ◽  
Load Spectrum ◽  
Thermal Spectrum ◽  
Stress And Deformation ◽  
Environment Condition

The thermo-viscoleastic behavior of composite materials is studied analytically using a special finite-element formulation. Numerical results on stress and deformation histories are obtained for both unnotched and notched graphite/epoxy composites subjected to mechanical and thermal spectrum loads. The results indicate that time-dependent effects are important in composites with matrix-dominated layup orientations. Such effects also strongly depend on the specific environment condition and load spectrum applied.

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