scholarly journals Stress Analysis of Buried Pipeline Installed by Horizontal Directional Drilling Using ANSYS Finite Element Software

2019 ◽  
Vol 07 (03) ◽  
pp. 365-378
Author(s):  
Francis Temilola Olumoko ◽  
Chinwuba Victor Ossia
Keyword(s):  
Finite Element ◽  
Stress Analysis ◽  
Directional Drilling ◽  
Buried Pipeline ◽  
Horizontal Directional Drilling ◽  
Finite Element Software

Stress Analysis of a Gas Pipeline Installed Using HDD and Auger Bore Techniques

2008 ◽  
Author(s):  
Paul Cousens ◽  
Chas Jandu
Keyword(s):  
Natural Gas ◽  
Stress Analysis ◽  
Transmission Network ◽  
Storage Facility ◽  
Directional Drilling ◽  
Sources Of Information ◽  
Horizontal Directional Drilling ◽  
Design Code ◽  
Traffic Loading ◽  
Natural Gas Transmission

As part of an important project to reinforce the natural gas transmission network, a new pipeline has been constructed to transport natural gas from a major UK LNG storage facility into the national transmission system. The project involved the installation of several sections by trenchless methods, namely auger boring for a number of road crossings and significant lengths of horizontal directional drilling (HDD) beneath railroads, canals and marshland. The installation of pipelines using trenchless techniques such as HDD continues to increase in popularity. The various methods available offer advantages over traditional open cut techniques, in particular much reduced disruption during the construction of road and rail crossings. Furthermore, increased awareness and responsibility towards the environment leads us to seek installation methods that cause the least disruption at the surface and have the least impact to the environment. It was required to assess the proposed crossing designs against acceptable stress limits set out in company specifications and against the requirements of UK design code IGE/TD/1 Edition 4 [1], which requires that ‘additional loads’ such as soil loadings, thermal loads, settlement and traffic loading are accounted for within the stress calculations. However, it does not stipulate the sources of such equations and the pipeline engineer must rely on other methods and published sources of information. This paper presents the method used to analyse those sections of the new pipeline installed by auger boring and HDD focusing on the methods and formulae used to calculate the stresses in the pipeline from all loading sources.

MECHANICAL SIMULATION AND ELECTROCHEMICAL CORROSION IN A BURIED PIPELINE WITH CORROSION DEFECTS SITUATED IN PERMAFROST REGIONS

2020 ◽  
pp. 2150002
Author(s):  
XIAOLI LI ◽  
LI CHEN ◽  
XIAOYAN LIU ◽  
YU ZHANG ◽  
LIFU CUI
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Simulation Analysis ◽  
Electrochemical Corrosion ◽  
Frost Heave ◽  
Buried Pipeline ◽  
Mechanical Coupling ◽  
Finite Element Software ◽  
Corrosion Defects ◽  
Permafrost Regions

The geological environment along a buried pipeline in permafrost regions is complex, where differential frost heave often occurs. To understand the changes in the stress behavior of pipeline structures caused by corrosion while laying them in permafrost regions, we established a thermo-mechanical coupling model of buried pipeline with corrosion defects by using finite element software. Numerical simulation analysis of buried pipeline was conducted. The effects of the frost heave length, the length of the transition section, the corrosion depth, and the corrosion length on the stress displacement were obtained. These analyses showed that the stresses and displacements of the pipeline with corrosion defects in permafrost regions can be simulated by using the finite element software numerical simulation method. Afterward, the corrosion resistances of pipelines with different corrosion lengths and depths were investigated via an electrochemical testing method. These results can provide some useful insights into the possible mechanical state of buried pipeline with regard to their design and construction, as well as some useful theoretical references for simulating real-time monitoring and safety analysis for their operation in permafrost regions.

scholarly journals Evaluation of Finite Element Software for Pavement Stress Analysis

2021 ◽  
Author(s):  
Huan Chen
Keyword(s):  
Finite Element ◽  
Stress Analysis ◽  
Concrete Slab ◽  
Flexible Pavement ◽  
Empirical Method ◽  
Future Trend ◽  
Traffic Load ◽  
Rigid Pavement ◽  
Finite Element Software ◽  
Pavement Engineering

Different approaches are usually taken when designing flexible and rigid pavement: the rigid concrete slab carries major portion of the traffic load; while for flexible pavement, external loads are distributed to the subgrade because of the relatively low modulus of elasticity of asphalt layer comparing to concrete in the case of rigid pavement. Pavement engineering has gone through major developments; the transition from Empirical Design Method to Mechanistic-Empirical Methods is becoming a near-future trend. The Mechanistic-Empirical Method has two components: (1) stress, strain and deflection are calculated based on analyzing mechanical characteristics of materials; (2) critical pavement distresses are quantitatively predicted by experimental calibrated equations. Hence, stress analysis has become an important role in pavement engineering. The most practical and widely used stress analysis method for flexible pavement is Burmister's Elastic Layered Theory; and for analyzing rigid pavement is Finite Element Method. KENSLABS and STAAD-III are both Finite Element software; KENSLABS is designed specifically for concrete pavement stress analysis, therefore it is more user-frielndly for pavement design; STAAD-III is more suitable for general plane and space structures. The project compares the use of both software for stress analysis in rigid pavement in term of simplicity and precision.

Layout Optimization of a Multiple Pinned Joint Under Bending in a Limited Contact Area

2013 ◽  
Author(s):  
Amir Mohsen Hejazi ◽  
Mohammad Pourgol Mohammad
Keyword(s):  
Genetic Algorithm ◽  
Finite Element ◽  
Stress Concentration ◽  
Stress Analysis ◽  
Optimization Problem ◽  
Optimization Problems ◽  
Optimization Methods ◽  
Limited Area ◽  
Design Factor ◽  
Finite Element Software

Layout determination of connectors in different mechanical configurations improves the design characteristics. The issue has recently become more practical in sensitive industries, especially in montage processes. Since connections are under different loads like bending, the layout of connection should be considered as an effective design factor in different loading conditions which is itself a step forward in achieving the optimized connection and also increases the connection life. This paper analyses the layout effects in a multiple pinned joint under bending in a limited area. The goal is to minimize the average stress and having a uniform stress distribution in the connections in order to prevent the failure inducing effect of stress concentration. The common method for solving these optimization problems is to couple two finite element numerical stress analysis software with an optimization tool or independent software which is a highly time consuming method due to enormous volume of the calculations in each iteration. In this paper the optimization problem is mathematically modeled and solved using Genetic Algorithm (GA). Genetic algorithm is found applicable here due to nonlinear behavior and complexity of the objective function in the optimization problem where analytical optimization methods are not useful. The validation results of stress analysis are obtained using finite element software. The optimized connections have longer lifetime and can carry higher loads because of degraded effects of stress concentration and minimized stresses.

Seismic Response of Ductile Cast Iron Buried Pipeline with Socket Joint

2014 ◽  
Vol 578-579 ◽  
pp. 886-889 ◽  
Author(s):  
Fan Gu ◽  
Duo Zhang ◽  
Jing Hai Zhou ◽  
Wei Wang
Keyword(s):  
Finite Element ◽  
Cast Iron ◽  
Time History ◽  
Ductile Cast Iron ◽  
Buried Pipeline ◽  
Flexible Joint ◽  
Coupling Interaction ◽  
Finite Element Software ◽  
Wave Passage ◽  
Excitation Method

By means of ANSYS finite element software, the numerical model of ductile cast iron buried pipeline with flexible joint was established, and the entire model was comprised of pipeline and its exterior massive soil for simulating the coupling-interaction between soil and pipeline. Meanwhile, the multi-point excitation method was adopted for considering the wave-passage effect. According to EI-centro seismic wave record corresponding to III site, the stress-time-history curve of pipeline body and the displacement-time-history curve of flexible joint were obtained, as well as the most dangerous parts might occur leakage were indicated, which provides the reference to the optimal design of ductile cast iron buried pipeline with flexible joint.

A Modified Weld Structure of Layered Urea Reactor Based on Stress Analysis and Leak Detection

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
Shugen Xu ◽  
Weiqiang Wang ◽  
Mengli Li
Keyword(s):  
Finite Element ◽  
Stress Analysis ◽  
Pressure Vessel ◽  
Calculation Result ◽  
Maximum Stress ◽  
Leak Detection ◽  
Finite Element Software ◽  
Weld Structure ◽  
Status Analysis ◽  
Modified Urea

In this paper, a modified weld structure of the layered urea reactor has been provided. In the modified structure, new circumferential weld can improve the stress status of the urea reactor. It has the both advantage of separated and integrated layered pressure vessel. This modified design is based on the stress status analysis and the requirement of leak detection. In order to evaluate the modified structure, stresses of original and modified urea reactor shell with interlayer gaps were calculated via Finite element software ANSYS 12.0. The calculation result shows that the maximum stress of the modified structure is reduced obviously in the same condition, and the leak of liner also can be detected effectively.

Fatigue Test and Stress Analysis of Threaded Connection of Arch Bridge Stainless Steel Suspender

2010 ◽  
Vol 452-453 ◽  
pp. 541-544 ◽  
Author(s):  
Yu Pu Song ◽  
Han Yong Liu
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Stress Analysis ◽  
Fatigue Test ◽  
Von Mises Stress ◽  
External Loading ◽  
Arch Bridge ◽  
Finite Element Software ◽  
Threaded Connection ◽  
Von Mises

This work presents a study of a fatigue test and a finite element analysis on an arch bridge stainless steel suspender with threaded connections. A suspender which had a diameter of 70mm was tested under axial tensile loads range from 430kN to 700kN. The suspender was sudden failure from the thread root of the first loaded tooth in the pin after 1546609 cycles. Then, a two-dimensional axisymmetric modeling ignoring the helix angle of the thread was established with finite element software ANSYS to perform a stress analysis of the threaded connection. The stress concentration factors (SCFs) at the root of the teeth of pin were investigated under the applied external loading. The conclusive results had been drawn from the analysis including the location and the value of maximum SCF in the pin. Finally, the location and the value of the maximum von Mises stress were given. The results showed that the location of the fracture surface was consistent with the location of the maximum von Mises stress.

scholarly journals Evaluation of Finite Element Software for Pavement Stress Analysis

2021 ◽  
Author(s):  
Huan Chen
Keyword(s):  
Finite Element ◽  
Stress Analysis ◽  
Concrete Slab ◽  
Flexible Pavement ◽  
Empirical Method ◽  
Future Trend ◽  
Traffic Load ◽  
Rigid Pavement ◽  
Finite Element Software ◽  
Pavement Engineering

Different approaches are usually taken when designing flexible and rigid pavement: the rigid concrete slab carries major portion of the traffic load; while for flexible pavement, external loads are distributed to the subgrade because of the relatively low modulus of elasticity of asphalt layer comparing to concrete in the case of rigid pavement. Pavement engineering has gone through major developments; the transition from Empirical Design Method to Mechanistic-Empirical Methods is becoming a near-future trend. The Mechanistic-Empirical Method has two components: (1) stress, strain and deflection are calculated based on analyzing mechanical characteristics of materials; (2) critical pavement distresses are quantitatively predicted by experimental calibrated equations. Hence, stress analysis has become an important role in pavement engineering. The most practical and widely used stress analysis method for flexible pavement is Burmister's Elastic Layered Theory; and for analyzing rigid pavement is Finite Element Method. KENSLABS and STAAD-III are both Finite Element software; KENSLABS is designed specifically for concrete pavement stress analysis, therefore it is more user-frielndly for pavement design; STAAD-III is more suitable for general plane and space structures. The project compares the use of both software for stress analysis in rigid pavement in term of simplicity and precision.

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