Strength Analysis of Buried Polyethylene Pipeline Under Ground Subsidence Considering Multivariate Influence

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
Ying Wu ◽  
Yuan Zhang ◽  
Sixi Zha ◽  
Guojin Qin
Keyword(s):  
Strain Rate ◽  
Influencing Factor ◽  
Equivalent Stress ◽  
Element Model ◽  
Ground Subsidence ◽  
Normal Operation ◽  
Strength Analysis ◽  
Transition Section ◽  
Correlation Degree ◽  
Maximum Equivalent Stress

Abstract Due to the combined effects of natural and human factors, the ground subsidence is aggravated, which brings potential hazards to the normal operation of buried polyethylene (PE) pipelines. A variety of variables influences the safety of buried pipelines, while the existing research lacks detailed analysis on the issue. A finite element model of buried PE pipeline was developed to analyze how various factors affected the strength of PE pipeline under ground subsidence. Furthermore, the orthogonal test combined with the gray correlation degree was used to analyze the significance of each influencing factor. The results show that (1) the strain rate of the pipe is different at different ground subsidence rates, and the maximum equivalent stress of the pipe increases with the increase of the strain rate; (2) the maximum equivalent stress diminishes with the increasing wall thickness of the pipeline and the length of the transition section; and (3) the factor that has the most significant influence on the maximum equivalent stress of the pipeline is the settlement, followed by the strain rate and the length of the transition section. The internal pressure has the least influence on the maximum equivalent stress in the context of ground subsidence induced stresses.

scholarly journals Strength analysis of capacitor energy storage cabinet of monorail elevated train

2022 ◽  
Vol 355 ◽  
pp. 02055
Author(s):  
Guojing Ye ◽  
Jinsong Zhou ◽  
Bingshao Li
Keyword(s):  
Energy Storage ◽  
Working Conditions ◽  
Equivalent Stress ◽  
Element Model ◽  
Strength Analysis ◽  
Static Calibration ◽  
Simulation Calculation ◽  
Maximum Equivalent Stress ◽  
Calculation Results ◽  
Design Requirements

Based on the actual parameters of the capacitor energy storage cabinet on the top of the monorail train, built the cabinet’s finite element model. Then, according to EN 12663-1, set the calibration conditions and fatigue working conditions. Carried out the simulation calculation under different conditions, respectively. The calculation results under the static calibration conditions show that the maximum equivalent stress of each node on the model is smaller than the allowable stress under all working conditions. Therefore, the static strength of the cabinet meets the design requirements. Plotted Goodman fatigue limit diagrams of the cabinet’s base metal and weld and modified them in the Smith form. Then plotted the average stress and stress amplitude under fatigue working conditions in the corresponding scatter diagram. The diagram s show that all points are located within the permitted area. The results show that the fatigue strength of the cabinet meets the requirements of design and use.

scholarly journals Numerical Simulation and Experimental Study on Axial Stiffness and Stress Deformation of the Braided Corrugated Hose

2021 ◽  
Vol 11 (10) ◽  
pp. 4709
Author(s):  
Dacheng Huang ◽  
Jianrun Zhang
Keyword(s):  
Numerical Simulation ◽  
Geometric Model ◽  
Equivalent Stress ◽  
Element Model ◽  
Maximum Error ◽  
Structural Features ◽  
Axial Stiffness ◽  
Frictional Stress ◽  
Maximum Equivalent Stress ◽  
Simulation Results

To explore the mechanical properties of the braided corrugated hose, the space curve parametric equation of the braided tube is deduced, specific to the structural features of the braided tube. On this basis, the equivalent braided tube model is proposed based on the same axial stiffness in order to improve the calculational efficiency. The geometric model and the Finite Element Model of the DN25 braided corrugated hose is established. The numerical simulation results are analyzed, and the distribution of the equivalent stress and frictional stress is discussed. The maximum equivalent stress of the braided corrugated hose occurs at the braided tube, with the value of 903MPa. The maximum equivalent stress of the bellows occurs at the area in contact with the braided tube, with the value of 314MPa. The maximum frictional stress between the bellows and the braided tube is 88.46MPa. The tensile experiment of the DN25 braided corrugated hose is performed. The simulation results are in good agreement with test data, with a maximum error of 9.4%, verifying the rationality of the model. The study is helpful to the research of the axial stiffness of the braided corrugated hose and provides the base for wear and life studies on the braided corrugated hose.

BIOMECHANICAL STABILITY OF THE CERVICAL SPINE AFTER UNCINATE PROCESS RESECTION: A FINITE ELEMENT ANALYSIS

2015 ◽  
Vol 15 (06) ◽  
pp. 1540049 ◽  
Author(s):  
XUEFENG BO ◽  
XI MEI ◽  
HUI WANG ◽  
WEIDA WANG ◽  
ZAN CHEN ◽  
...  
Keyword(s):  
Finite Element ◽  
Cervical Spine ◽  
Equivalent Stress ◽  
Three Dimensional ◽  
Element Model ◽  
Uncinate Process ◽  
Total Deformation ◽  
Maximum Equivalent Stress ◽  
Left And Right ◽  
The Stability

When performing anterolateral foraminotomy for the treatment of cervical spondylotic radiculopathy, the extent of uncinate process resection affects the stability of the cervical spine. The aim of this study was to determine the stability of the cervical spine after resection of various amounts of the uncinate process. Based on computed tomography (CT) scans of an adult male volunteer, a three-dimensional geometric model of the cervical spine (C4-C6) was established using Mimics 13.1, SolidWorks 2012, and ANSYS 15.0 software packages. Next, the mechanical parameters of the tissues were assigned according to their different material characteristics. Using the tetrahedral mesh method, a three-dimensional finite element model of the cervical spine was then established. In modeling uncinated process resection, two excision protocols were compared. The first excision protocol, protocol A, mimicked the extent of resection used in current clinical surgical practice. The second excision protocol, protocol B, employed an optimal resection extent as predicted by the finite element model. Protocols A and B were then used to resect the left uncinate process of the C5 vertebra to either 50% or 60% of the total height of the uncinate process. The stability of the cervical spine was assessed by evaluating values of deformation and maximum equivalent stress during extension, flexion, lateral bending, and rotation. After protocol A resection, the total deformation was increased as was the maximum equivalent stress during left and right rotation. After protocol B resection, the total deformation was little changed and the maximum equivalent stress was visibly decreased during left and right rotation. As evidenced by these results, protocol B resection had relatively little effect on the stability of the cervical spine, suggesting that resection utilizing the limits proposed in protocol B appears to better maintain the stability of the cervical spine when compared with current clinical surgical practice as replicated in protocol A.

Finite Element Analysis of Hydraulic Clipping Machine Shear Platform Dased on ANSYS

2014 ◽  
Vol 945-949 ◽  
pp. 190-193
Author(s):  
Hai Lin Wang ◽  
Yi Hua Sun ◽  
Ming Bo Li ◽  
Gao Lin ◽  
Yun Qi Feng ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Elastic Strain ◽  
Optimization Design ◽  
Equivalent Stress ◽  
Element Model ◽  
Element Analysis ◽  
Maximum Equivalent Stress

Q43Y-85D type crocodile hydraulic clipping machine was taken as research object to optimization design. A finite element model for clipping machine was built using shell unit as fundamental unit. ANSYS12.0 finite element method was used to analyze the deformation and stress distribution of the shear platform model of hydraulic clipping machine. The result showed that the maximum equivalent stress at the dangerous area was 368.162 MPa and the maximum elastic strain was 0.1814×10-2 mm. After the structural optimization design, it was found that the maximum equivalent stress decreased to 186.238 MPa which did not exceed the material’s yield limitation 215 MPa and the maximum elastic strain decreased to 0.919×10-3 mm which satisfied the requirement of stiffness.

Vibration Modal Analysis and Structural Optimal Design of Car Rear-View Mirror Based on ANSYS

2012 ◽  
Vol 549 ◽  
pp. 848-851
Author(s):  
Zhi Ping Zhang ◽  
Han Wu Liu ◽  
Wen Tao He ◽  
Yong Hui Gao
Keyword(s):  
Optimal Design ◽  
Dynamic Characteristics ◽  
Equivalent Stress ◽  
Low Rank ◽  
Strength Analysis ◽  
Modal Frequency ◽  
Rear View Mirror ◽  
Finite Element Software ◽  
Optimizing Design ◽  
Maximum Equivalent Stress

In order to improve the safety of the moving car,we have to make simulation and analysis of the dynamic characteristics of the car rear-view mirror. We should consider, in addition to the geometric dimensions, standards and demands, a reasonable choice of the mirror size and installing position, the dynamic characteristics of the car rear-view mirror in the design of the car rear-view mirror. In this paper, we use the finite element software ANSYS to simulate the vibration frequency and vibration modals of the car rear-view mirror under the condition of excitation sources. Based on this and the strength analysis results of the rear-view mirror, we make a optimal design of the rear-view mirror structure. We get five-order vibration modals in working condition and analysis the size of displacement and deformation, and dynamic characteristics. The results show that because of the low modal frequency, the car rear-view mirror is easily inspired by the engine, powertrain system and road to vibrate. Besides, the deformation and the strain distribution of the rear-view mirror are not uniform. So we should control the low rank flexibility modal frequency within a certain threshold frequency when designing its structure. On the condition of little changes of its overall volume, the maximum equivalent stress of the rear-view mirror decreased by 30.5% through optimizing design.

Simulation of Nano-Indentation of Nano SiC Ceramic Micro-Component

2011 ◽  
Vol 675-677 ◽  
pp. 263-266
Author(s):  
Ke Zhang ◽  
Ju Ping Ren ◽  
Guo Zhi Liu ◽  
Yu Lan Tang ◽  
Yu Hou Wu
Keyword(s):  
Md Simulation ◽  
3D Model ◽  
Mechanical Performance ◽  
Equivalent Stress ◽  
Fem Simulation ◽  
Element Model ◽  
Performance Parameters ◽  
Sic Ceramic ◽  
Maximum Equivalent Stress ◽  
Hot Pressing Sintering

A 3D model of molecular dynamics for nanoceramic SiC is adopted to simulate the hot pressing sintering and preparation process of SiC, and mechanical properties such as density, hardness and elastic modulus are calculated. Finite element model of indentation is established based on the mechanical performance parameters from MD simulation. Conical indenter is adopted in indentation simulation. The FEM simulation results show that: Maximum equivalent stress appears at the place of indenter tip, and equivalent stress curves are appeared hemispherical. As indentation depth increases, the stress increased. As the distance of away from the indenter increases, the displacement in equivalent displacement nephogram gradually decreased until zero. During unloading process, elastic restitution is occurred. The elastic restitution in the area of below the indenter is obviously. Residual stress in the center of indentation is maximal after unloading.

Analysis of Sealing Ability of Premium Tubing Connection under Axial Alternating Tension Load

2013 ◽  
Vol 634-638 ◽  
pp. 3569-3572 ◽  
Author(s):  
Yi Hua Dou ◽  
Xing Wang ◽  
Yang Yu ◽  
Xiang Tong Yang
Keyword(s):  
Contact Pressure ◽  
Equivalent Stress ◽  
Element Model ◽  
Linear Elastic ◽  
Axial Tension ◽  
Inner Pressure ◽  
Tension Load ◽  
Sealing Ability ◽  
Maximum Equivalent Stress ◽  
Maximum Contact

In order to know the sealing ability under axial alternating tension load, a 88.9mm×6.45mm P110 premium tubing connection is established with multiple linear elastic plastic finite element model, stress and contact pressure on sealing surface and torque shoulder are analyzed under axial alternating tension load and 80 MPa inner pressure. The results show that tubing connection slide by the axial tension, while the maximum contact pressure on seal surface reduced. With the increasing of alternating cycle, the maximum equivalent stress on seal surface increased and the maximum contact pressure on seal surface decreased. And, under limited loads, contact pressure on torque shoulder is affected little caused by alternating load.

scholarly journals Static analysis on spherical magnetically suspending rotor based on finite element

2018 ◽  
Vol 198 ◽  
pp. 04001
Author(s):  
Weijie Wang ◽  
Ren Yuan ◽  
Zengyuan Yin
Keyword(s):  
Finite Element ◽  
Static Analysis ◽  
Equivalent Stress ◽  
Element Model ◽  
Flow Mode ◽  
Element Analysis ◽  
Finite Element Software ◽  
Maximum Equivalent Stress ◽  
Static Mechanical ◽  
Design Speed

In this paper, the static mechanical properties of a spherical magnetically suspending rotor are studied based on the finite element analysis method. The structure of the spherical magnetically suspending rotor is designed. The characteristics of the spherical magnetically suspending rotor are analysed and the necessity of static analysis is pointed out. The main content and general flow of statics analysis are discussed. The two working modes (GUI mode and command flow mode based on APDL) of the finite element software ANSYS are compared and analysed. Then the finite element model of the spherical magnetically suspending rotor is established by the command flow method, and the detailed modelling steps are given. On this basis, the static characteristics of the spherical magnetically suspending rotor are simulated and analysed. The simulation results show that the maximum equivalent stress and rigid body displacement of the rotor are within the safety threshold at a design speed of 10000rpm.

Strength Analysis of Transitional Segment of Buckling Tubing Nearby the Packer in Vertical Well

2013 ◽  
Vol 634-638 ◽  
pp. 3599-3602
Author(s):  
Shao Li Zhang ◽  
Xin He Wang ◽  
Jiang Wen Xu ◽  
Yi Hua Dou ◽  
Hui Xia
Keyword(s):  
Stress Analysis ◽  
Equivalent Stress ◽  
Continuity Condition ◽  
Strength Analysis ◽  
Nonlinear Ordinary Differential Equations ◽  
Axial Pressure ◽  
Buckling Strength ◽  
Vertical Well ◽  
Maximum Equivalent Stress ◽  
Helical Buckling

The buckling deformation and stress distribution of the tubing nearby the packer would be seriously influenced by the packer constraints. This paper focused on the Strength analysis of transitional segment. The method to calculate the buckling deformation and the equivalent stress of transitional segment were derived considering the tubing boundary and continuity condition, adopting the fourth-order nonlinear ordinary differential equations and helical buckling strength method. This study makes up for the weakness of traditional stress analysis of the buckling tubing nearby the packer in vertical well, improves the pertinence and accuracy of stress analysis of buckling tubing. The results of analysis show that with the axial pressure increasing lead to the length of the transitional segment irregular fluctuations and the maximum equivalent stress increasing. The equivalent stress would gradually reduce and finally approach a constant.

Numerical Simulation and Deformation Research for Cold Enlarging Tube Diameter

2011 ◽  
Vol 675-677 ◽  
pp. 715-718
Author(s):  
Wei Hua Kuang ◽  
Ling Liao Zeng
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Finite Element Model ◽  
Strain Rate ◽  
Time Variation ◽  
Equivalent Stress ◽  
Element Model ◽  
Development Trend ◽  
Equivalent Strain ◽  
Equivalent Strain Rate

This paper presented how to build finite element model based on UG NX, and simulated the cold expanding process by DEFORM software. The deformation, distribution and development trend of velocity, equivalent stress, equivalent strain and equivalent strain rate were predicted. The punch’s load-time variation curves in X, Y and Z direction were also obtained.

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