scholarly journals Reinforcement Effect of a Concrete Mat to Prevent Ground Collapses Due to Buried Pipe Damage

2020 ◽  
Vol 10 (16) ◽  
pp. 5439
Author(s):  
Jeongjun Park ◽  
Yoonseok Chung ◽  
Gigwon Hong
Keyword(s):  
Stress Reduction ◽  
Maximum Stress ◽  
Ground Subsidence ◽  
Reinforcement Effect ◽  
Uniform Load ◽  
Buried Pipe ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Installation Depth ◽  
Load Conditions

This study described a ground reinforcement effect of a concrete mat, in order to apply a concrete mat for ground subsidence restoration of an open cut. A concrete mat can prevent the expansion of a cavity and relaxation area underground due to buried pipe damage when the buried pipe is in use. An experimental study was conducted to analyze the stress distribution characteristics of an underground area by ground reinforcement of a concrete mat. In addition, a numerical analysis was performed to estimate the range of underground reinforcement of a concrete mat. As an experiment results, the maximum stress reduction ratio of the concrete mat in the underground was 28.5% to 30.9%, which means the reinforcement effect of the concrete mat, according to the installation depth of the concrete mat. The finite element analysis (FEA) results showed that the installation depth of the concrete mat differed in various scenarios, in order to secure the reinforcement effect of the concrete mat according to the load conditions (point and uniform load). Therefore, the reinforced depth of a concrete mat should be determined by the load type on the surface.

Optimization of Defense Hole System for Biaxial Loaded Plate with Three Coaxial Holes

2005 ◽  
Vol 8 (2) ◽  
pp. 117-128 ◽  
Author(s):  
Montasser Tahat ◽  
Salih Akour ◽  
Saad Habali ◽  
Jamal Nayfeh
Keyword(s):  
Stress Reduction ◽  
Maximum Stress ◽  
Biaxial Loading ◽  
Hole Diameter ◽  
Optimum Shape ◽  
Element Analysis ◽  
Principal Stress Direction ◽  
Structural Part ◽  
The Finite Element Analysis ◽  
Circular Holes

Optimum design of elliptical Defense Hole System (DHS) under biaxial loading in a finite plate with a row of circular holes is presented. Maximum stress reduction is made possible by introducing elliptical auxiliary holes close to the mainmain holes in the areas of low stresses along the principal stress direction. A systematic study is undertaken by using the finite element analysis (FEA) to determine the optimum shape, location and size of the auxiliary defense hole system. These parameters are examined in relation to plate dimensions for a number of plates with different mainmain-hole-diameter to plate-width ratios and different pitch to main-hole-diameter ratios. Maximum stress reductions from 6–18% were achieved. With such reduction in the maximum stress level the improvement in fatigue life of a structural part can be very significant. The FEA results are validated experimentally by applying an enhanced RGB-photoelasticity technique. The photoelasticity experimental results and the FEA results show good agreement.

Determination of Stress Concentration Around an Oblique Hole by a Finite-Element Technique

1983 ◽  
Vol 105 (2) ◽  
pp. 206-212 ◽  
Author(s):  
Hua-Ping Li ◽  
F. Ellyin
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Maximum Stress ◽  
Plate Thickness ◽  
Two Dimensional ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Parametric Studies ◽  
Element Technique

A plate weakened by an oblique penetration of a circular cylindrical hole has been investigated. The stress concentration around the hole is determined by a finite-element method. The results are compared with experimental data and other analytical works. Parametric studies of effects of angle of inclination, plate thickness, and width are performed. The maximum stress concentration factor (SCF) obtained from the finite-element analysis is higher than experimental results, and this deviation increases with the increase of angle of skewness. The major reason for this difference is attributed to the shear-action between layers parallel to the plate surface which cannot be directly included in the two-dimensional elements. An empirical formula is derived which accounts for the shear-action and renders the finite-element predictions in line with experimentally observed data.

scholarly journals The Effect of Knee Flexion Angle on Contact Stress of Total Knee Arthroplasty

2018 ◽  
Vol 225 ◽  
pp. 03009 ◽  
Author(s):  
N.M.A. Azam ◽  
Rosdi Daud ◽  
H. Mas Ayu ◽  
J. Ramli ◽  
M.F.B. Hassan ◽  
...  
Keyword(s):  
Finite Element ◽  
Total Knee Arthroplasty ◽  
Contact Stress ◽  
Knee Arthroplasty ◽  
Maximum Stress ◽  
Flexion Angle ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Current Design ◽  
Total Knee

The effect of flexion angle on contact stress of the knee joint still open to the debate since lack of proof shown that flexion angles does effect the contact stress of Total Knee Arthroplasty (TKA). Thus the aim of this study is to investigate the effect of different flexion angle on contact stress of TKA via finite element method. The TKA is simulated using ANSYS Workbench and the applied loads are 2200 N, 3200 N and 2800 N. The Finite element Analysis (FEA) results for maximum stress of current and proposed designed were then compared. For the new proposed design, the maximum stress for 15° is 12.2 MPa, 45° is 23.6 MPa and 60° is 22.5 MPa which is lower than current design. Thus, it can be concluded that the new proposed design better than current design in term of contact stress. While, the different flexion angle do gives an impact on the performance of the TKA.

The Analysis of Mutual Authentication between Finite Element Analysis and Qi Erxi Answer

2011 ◽  
Vol 396-398 ◽  
pp. 1228-1231
Author(s):  
Yu Li Liu ◽  
Hai Bo Liu ◽  
Bo Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentration ◽  
Maximum Stress ◽  
Mutual Authentication ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Edge Stress

In this paper, the sheet with hole for the finite element analysis, the location of maximum stress and maximum stress values are obtained under different load of edge of the hole, and the finite element analysis results compared with the classic Qi Erxi answers. This coincidence is not accidental, but it just shows their correctness. Therefore, we can use Qi Erxi answer when the calculation of the hole’s edge stress concentration and the condition of the force and the boundary are simple; while the it is complex, the finite element analysis can be used.

scholarly journals Finite Element Analysis of the Mechanism of Traumatic Aortic Rupture (TAR)

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
JiFeng Nan ◽  
Mohammadreza Rezaei ◽  
Rashid Mazhar ◽  
Fadi Jaber ◽  
Farayi Musharavati ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Maximum Stress ◽  
Fe Simulation ◽  
Aortic Rupture ◽  
Stress And Strain ◽  
Element Analysis ◽  
Car Crash ◽  
The Finite Element Analysis ◽  
Aorta Injury

As many as 80% of patients with TAR die on the spot while out of those reaching a hospital, 30% would die within 24 hours. Thus, it is essential to better understand and prevent this injury. The exact mechanics of TAR are unknown. Although most researchers approve it as a common-sense deceleration injury, the exact detailed mechanism of TRA still remains unidentified. In this work, a deceleration mechanism of TAR was carried out using finite element analysis (FEA). The FE analysis aimed to predict internal kinematics of the aorta and assist to comprehend the mechanism of aorta injury. The model contains the heart, lungs, thoracic aorta vessel, and rib cage. High-resolution computerized tomography (HR CT scan) was used to provide pictures that were reconstructed by MIMICS software. ANSYS FE simulation was carried out to investigate the behavior of the aorta in the thoracic interior after deceleration occurred during a car crash. The finite element analysis indicated that maximum stress and strain applied to the aorta were from 5.4819e5 to 2.614e6 Pa and 0.21048 to 0.62676, respectively, in the Y-direction when the initial velocity increased from 10 to 25 m/s. Furthermore, in the X-direction when the velocity changed from 15 to 25 m/s, the stress and strain values increased from 5.17771e5 to 2.3128e6 and from 0.22445 to 0.618, respectively.

Seismic Response Research on Oil Pipeline with Corrosion Defects

2012 ◽  
Vol 166-169 ◽  
pp. 2124-2127
Author(s):  
Han Bing Qi ◽  
Qiu Shi Wang ◽  
Li Li Wang ◽  
Xiao Dan Wu
Keyword(s):  
Seismic Response ◽  
Maximum Stress ◽  
Great Influence ◽  
Time History ◽  
Element Analysis ◽  
Oil Pipeline ◽  
The Finite Element Analysis ◽  
Oil Pipelines ◽  
History Of ◽  
Corrosion Defects

The finite element analysis method was used to analyze the seismic response of two oil pipelines, which have corrosion defects and no defects correspondingly. The velocity, displacement and acceleration time history of the two pipelines and the contrastive analysis of the maximum stress of two pipelines were obtained. The results show that the displacement, velocity and acceleration of the pipeline with corrosion defects are larger than those of the pipeline without corrosion defects, the corrosion has great influence on the bottom of the pipeline, and the influence also has certain wide, the farther away from the corrosion, the smaller the influence is.

Finite Element Analysis of Pump Casing for Triplex Plunger Pump Based on Abaqus

2011 ◽  
Vol 337 ◽  
pp. 219-224
Author(s):  
Xia He ◽  
Chong Jun Huang ◽  
Qing You Liu ◽  
Yang Liu ◽  
Jia Yu Tian
Keyword(s):  
Cross Section ◽  
Maximum Stress ◽  
3D Models ◽  
Element Analysis ◽  
Plunger Pump ◽  
Design Improvement ◽  
Programming Software ◽  
Crankshaft Rotation ◽  
Abaqus Software ◽  
Load Conditions

The force of pump casing for triplex plunger was very complex, as well as the loads varied with the angle of crankshaft rotation. Using VB programming software obtained the load of pump casing anywhere, then 3D models of pump casing of triplex plunger pump have been created by utilizing Pro/E, and strength calculation of the pump casing was analyzed by utilizing Abaqus software in six different load conditions. The results indicated that the dangerous cross section and the stress distribution have been found and the maximum stress of the pump casing was 297.3 MPa, which was less than the limit of yielding strength but met the overall strength of pump casing. This research was significant for the reliability evaluation and the design improvement of the pump casing.

Mechanical Properties of a One-Way Beam String Structure with the Cooperation of the Supporting Structure

2010 ◽  
Vol 163-167 ◽  
pp. 701-707
Author(s):  
Yun Jing Nie ◽  
Tie Ying Li
Keyword(s):  
Mechanical Properties ◽  
Analysis Software ◽  
Element Analysis ◽  
Single Beam ◽  
Supporting Structure ◽  
Practical Project ◽  
The Finite Element Analysis ◽  
String Structure ◽  
The One ◽  
Load Conditions

In this paper, taking a practical project for the study, using the finite element analysis software ANSYS, static analyses under different load conditions are performed on a single beam string structure (BSS) and a one-way beam string structure with the cooperation of the supporting structure, respectively. Moreover, influence of factors on mechanical properties of the one-way BSS with the cooperation of the supporting structure is investigated. The factors include grouting, support form, corrosion. The results can provide a reference for design and construction of the same type of structure.

K-Type, Inverse K-Type and X-Type Legs Stability Analysis of Jack-Up Offshore Platform

2013 ◽  
Vol 312 ◽  
pp. 205-209
Author(s):  
Wen Xian Tang ◽  
Jun Cao ◽  
Jian Zhang ◽  
Chao Gao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Maximum Stress ◽  
Offshore Platform ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Design Requirements ◽  
The Stability ◽  
Jack Up ◽  
Survival Condition

The force situation of truss legs has an important impact on the jack-up offshore platform. The finite element analysis on three types truss leg was made, and the stability of the three types truss leg under preload, operating and storm survival condition was discussed. The result showed that the maximum stress was in the chord; they met the design requirements; K type, inverse K type can save material, and they both met resonance requirements. The former had a better stability under preload condition, and the later had the best stability under operating, storm survival condition.

Force Analysis and Optimal Design of Propeller for Garbage Powder Mixer

2011 ◽  
Vol 422 ◽  
pp. 438-442
Author(s):  
Mei Fa Huang ◽  
Wei Zhao Luo ◽  
Guang Qian
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Optimal Design ◽  
Stress Analysis ◽  
Maximum Stress ◽  
Working Condition ◽  
Force Analysis ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Simulation Results

Propeller is one of the critical parts in garbage powder mixer and affect significantly to the performance. In order to obtain a more reasonable structure, force analysis and stress analysis is carrier out for the propeller based on the actual working condition. Optimal design for the propeller is implemented by the results of stress analysis. To verify the rationality and feasibility of this mechanism, the finite element analysis for the propeller is performed by using the ANASYS software. The simulation results show that the maximum stress of the propeller is on the joint of blade and rod. The optimized propeller is satisfied with the strength requirements.

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