A Case Study of Stress Analysis of Pipeline in River Crossing Tunnel

2014 ◽  
Author(s):  
Xiaolin Wang ◽  
Xianzhi Qi ◽  
Jianhua Fang ◽  
Yan Di
Keyword(s):  
Finite Element ◽  
High Stress ◽  
Longitudinal Force ◽  
Large River ◽  
Operation Condition ◽  
Element Analysis ◽  
External Temperature ◽  
Constrained Damping ◽  
Stress And Deformation ◽  
Maximum Design

Tunnel by digging is accepted as one of the most effective methods for river-crossing in pipeline constructions, especially for large river-crossing. Pipeline is often installed on a series of low supports in the tunnel underneath river. Generally, pipeline in tunnel experiences various loadings during service period due to operational and environmental conditions, such as operation pressure fluctuation, external temperature variation or support damage. Under these loadings, high stress and huge longitudinal force may be accumulated in pipe that may eventually result in pipeline elongation or bending. These kinds of deformation have been found in pipelines in some river crossing tunnels. To investigate the mechanical behavior of pipeline in tunnel crossing, finite element models (FEM) are produced to simulate pipeline operation condition and the maximum design operation condition. With FEM, stress distribution and deformation of pipeline are analyzed. The result shows that 1) axial elongation of pipeline from finite element analysis is in accordance with that of on-site measurement, 2) pipeline is analyzed to be safe under operation condition or the maximum design operation condition, 3) supports should be designed and constructed with enough strength to resist the force from pipeline deformation, and 4) some treatments are proposed to solve the problems of pipeline in tunnel crossing. Finally, a new type of support with vertical constrained damping is designed for stress and deformation relief of pipeline in tunnel crossing.

The Finite Element Analysis of a Heavy Semi-Trailer Frame Based on ANSYS

2014 ◽  
Vol 644-650 ◽  
pp. 455-458
Author(s):  
Yao Ye ◽  
Yong Hai Wu
Keyword(s):  
Finite Element ◽  
Geometric Model ◽  
Reference Method ◽  
Element Model ◽  
Element Analysis ◽  
Emergency Braking ◽  
The Finite Element Analysis ◽  
New Type ◽  
Stress And Deformation ◽  
3D Geometric Model

Frame has important effects on the performance of the whole of heavy semi-trailer. A heavy semi-trailer frame is analyzed and researched on in the finite-element way in this article. The frame of 3D geometric model is established by using Pro/E. And it was imported into the Hypermesh to establish frame finite element model. Frame are calculated by using ANSYS solver in bending condition, emergency braking conditions and rapid turn conditions of stress and deformation conditions. The computational tools and methods we used provide the new type of frame and development with a reference method to refer to in this paper.

Finite Element Analysis of Residual Stresses in Threaded End Closures

1991 ◽  
Vol 113 (3) ◽  
pp. 398-401 ◽  
Author(s):  
A. Chaaban ◽  
U. Muzzo
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Bauschinger Effect ◽  
High Stress ◽  
Empirical Method ◽  
Pressure Vessels ◽  
Element Analysis ◽  
High Stress Concentration ◽  
Proof Testing ◽  
Pressure Cycle

Due to the high stress concentration at the root of the first active thread in threaded end closures of high pressure vessels, yielding may occur in this region during the application of the first pressure cycle or proof testing. This overstraining introduces residual stresses that influence the fatigue performance of the vessel. This paper presents a parametric analysis of threaded end closures using elastic and elasto-plastic finite element solutions. The results are used to discuss the influence of these residuals on the estimated fatigue life when the vessel is subjected to repeated internal pressure. A simple empirical method to allow for the Bauschinger effect of the material is also proposed.

Finite Element Analysis of Ground Imitating Tank

2005 ◽  
Author(s):  
Jiemin Liu ◽  
Guangtao Ma
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Dead Weight ◽  
Element Analysis ◽  
Thin Walled ◽  
The Dead ◽  
Stress And Deformation ◽  
Inertia Forces ◽  
Element Method

A typical ground imitating tank is analyzed regarding it as the thin-walled structure composed of plates (skins) and beams (reinforcement) using finite element method (FEM). Through moving the location of reinforcements, make the skins close with the flanges of the reinforcements in order to imitate actually the connection of the skins and the reinforcements. The thickness of plates, the size and the geometry shape and the location of reinforcements are taken as parameters to be optimized. In calculation, not only consider effects of the oil-weight, the extra-pressure in tank and the dead weight of the tank on the stresses and displacements of the tank, but also analyze the effects of the inertia forces produced due to the rotation of the tank on the stresses and displacements. Displacement, stress and deformation distributions of the ground imitating tank under the three typical flying postures imitated are given.

Finite Element Analysis of Fixed Medial Malleolar Fractures

2013 ◽  
Author(s):  
Ruchi D. Chande ◽  
John R. Owen ◽  
Robert S. Adelaar ◽  
Jennifer S. Wayne
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Performance ◽  
External Rotation ◽  
Weight Bearing ◽  
High Stress ◽  
Ankle Injuries ◽  
Deltoid Ligament ◽  
Medial Malleolus ◽  
Element Analysis

The ankle joint, comprised of the distal ends of the tibia and fibula as well as talus, is key in permitting movement of the foot and restricting excessive motion during weight-bearing activities. Medial ankle injury occurs as a result of pronation-abduction or pronation-external rotation loading scenarios in which avulsion of the medial malleolus or rupture of the deltoid ligament can result if the force is sufficient [1]. If left untreated, the joint may experience more severe conditions like osteoarthritis [2]. To avoid such consequences, medial ankle injuries — specifically bony injuries — are treated with open reduction and internal fixation via the use of plates, screws, wires, or some combination thereof [1, 3–4]. In this investigation, the mechanical performance of two such devices was compared by creating a 3-dimensional model of an earlier cadaveric study [5], validating the model against the cadaveric data via finite element analysis (FEA), and comparing regions of high stress to regions of experimental failure.

260t Ladle Stress and Deformation Finite Element Analysis

2014 ◽  
Vol 936 ◽  
pp. 1886-1889
Author(s):  
Yan Ping Sun ◽  
De Chen Zhang ◽  
Ming Yang ◽  
Yuan Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Working Conditions ◽  
Structural Deformation ◽  
Analysis Software ◽  
Element Analysis ◽  
Strength And Stiffness ◽  
Stress And Deformation ◽  
Distribution Of Stress ◽  
Optimal Designing

In this paper, iron ladle stress and deformation has been accurately calculated using finite element analysis software ANSYS based on 260t iron ladle in standing, lifting, tipping working conditions. Distribution of stress field was obtained. The stiffness and strength of the iron ladle has been evaluated. The results show that the iron ladle in the standing, lifting and tipping working conditions, structural deformation is small, the strength and stiffness meet the requirements. This research extends the working life of 260t iron ladle. It provides theoretical basis for producing and using of the iron ladle and further optimal designing.

Analysis of Instant Contact Nonlinear on Round Link Chain Based on Symmetric Penalty Function Method

2011 ◽  
Vol 148-149 ◽  
pp. 272-275
Author(s):  
Wei Kang Li ◽  
Jun Mao ◽  
Xin Le Yang
Keyword(s):  
Finite Element ◽  
Working Conditions ◽  
Penalty Function ◽  
Function Method ◽  
Penalty Function Method ◽  
Element Analysis ◽  
Finite Element Software ◽  
Sudden Loading ◽  
Contact Impact ◽  
Stress And Deformation

In order to analyze deformation and stress state of round link chain which is generated by driving sprocket for sudden loading or starting moment between the chains during the working conditions, the symmetric penalty function method was utilized in contact-impact interface of LS-DYNA program and the finite element software ANSYS/LS-DYNA was used to carry on 3D nonlinear contact analysis of three round link chains, the curves of stress and deformation with varying time were gained by simulating the process of the instant contact-impact of chains. The results show that the largest stress value is appeared on the contacting curved arm of driven round link chain, the second stress value is connecting round link chain, the least stress value is driving round link chain; it is circular shape of the contact area of round link chains and it is the main reasons of damage that the largest stress and deformation values of impact is caused by instant changing loading when time lasts 0.05s, and the series gradually fluctuation of strength is led to fatigue through finite element analysis software. The symmetric penalty function method of finite elements can provide a theoretical basis and simulation methods for analyzing the round link chain driving in a variety of different working conditions under the conditions of contact-impact.

Finite Element Stress Analysis of Composite Sucker Rods

2003 ◽  
Vol 125 (4) ◽  
pp. 299-303 ◽  
Author(s):  
Eyassu Woldesenbet
Keyword(s):  
Finite Element ◽  
High Stress ◽  
Experimental Tests ◽  
Fatigue Loading ◽  
Stress Concentrations ◽  
Element Analysis ◽  
Composite Rod ◽  
Rod System ◽  
Sucker Rod ◽  
2D And 3D

Analysis of polymer-matrix composite sucker rod systems using finite element methods is performed. Composite sucker rods used in oil production fail mainly due to fatigue loading. In majority of cases, the failure is in the region of the joint where the composite rod and the steel endfitting meet. 2D and 3D Finite Element Analysis and experimental tests are carried out in order to observe the stress distribution and to find the regions of stress concentrations inside the endfitting. The causes of failure of the composite sucker rods are identified as high transverse compressive stress caused by overloading that results in the crushing of the rod, and high stress concentrations present at the grooves of the endfitting that initiate premature cracks. Based on the result of this study, enhanced design of the composite sucker rod system can be accomplished.

Nonlinear Finite Element Analysis for Stress and Deformation of CFRD

2015 ◽  
Vol 744-746 ◽  
pp. 536-539
Author(s):  
Shu Yun Ding ◽  
Zhi Quan Huang ◽  
Shi Ming Yu
Keyword(s):  
Finite Element ◽  
Shear Failure ◽  
Material Model ◽  
Small Range ◽  
Element Analysis ◽  
Dam Foundation ◽  
Constitutive Material Model ◽  
Calculation Results ◽  
The Face ◽  
Stress And Deformation

Based on Duncan-Chang’s E-B constitutive material model, the finite element calculating model for a CFRD was established, and has obtained the stress-strain distribution and variety rule at the dam and the face slab in construction period and water store period. The calculation results show that: the stress-deformation behavior of the dam is normal, the deformation values within the acceptable range; the shear failure for the dam is almost impossible; stress concentration and tensile loading on small principal stress was exist on small range of the dam foundation covered by toe slab; the substantially change of water level has great effect on the deformation and camber of the face slabs; the faults structures in dam foundation only has affect the stress distribution of the foundation, but has weak impact of the stress and deformation of the dam body.

Finite Element Analysis on Hybrid City Bus Frame Based on ANSYS-Workbench14

2014 ◽  
Vol 662 ◽  
pp. 214-219 ◽  
Author(s):  
Ming Lei Wan ◽  
Zuo Qiang Dai ◽  
Hong Xin Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Analysis ◽  
Maximum Deformation ◽  
City Bus ◽  
Three Dimensional Modeling ◽  
New Energy ◽  
Inherent Frequency ◽  
Stress And Deformation

Abstract. For analyzing the frame whether meets actual driving needs, LCK6105PHENV-type hybrid (electric and gas) city bus frame as research object, using Solidworks12 and ANSYS-Workbench14 on frame, respectively, for the three-dimensional modeling and finite element analysis. Static analysis obtains frame’s stress and deformation results under the condition of bending and reversing (wheels dangling), modal analysis gets frame’s front 6 order vibration type, inherent frequency and the maximum deformation. Analyzing results shows that the frame basically can meet the design requirements, and in line with the actual needs of living and production. This research will provide references for optimization and improvement of new-energy Auto frame.

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