Numerical Analysis of Tension Force Subjected by Flexible Mattress

2015 ◽  
Vol 740 ◽  
pp. 116-119
Author(s):  
Zhen Yu Li ◽  
Ping Yang ◽  
Zhi Hua Sun ◽  
Lin Suan Liu
Keyword(s):  
Numerical Analysis ◽  
Large Strain ◽  
Fem Analysis ◽  
Tension Force ◽  
Stress And Strain ◽  
Nonlinear Fem ◽  
Fem Model ◽  
In Situ Test ◽  
Distribution Of Stress

The nonlinear FEM analysis is performed to the problem of large strain nonlinear application for flexible mattress. The element with cloth type option is used to establish the FEM model for the analysis of flexible mattress. The simulation can produce correct profile of deformation, accurate distribution of stress and strain, meanwhile taking account of geometric nonlinear from large strain. The results of the paper are compared with those from the theory and in-situ test. Some valuable conclusions are made from the results analysis.

Research on the Stress and Strain Field and Wall Thickness in Power Spinning of Ellipsoidal Heads with Variable Thickness

2011 ◽  
Vol 189-193 ◽  
pp. 1960-1963 ◽  
Author(s):  
Jin Hui Zhang ◽  
He Yang ◽  
Mei Zhan ◽  
Hua Bing Jiang
Keyword(s):  
Contact Zone ◽  
Wall Thickness ◽  
Variable Thickness ◽  
Large Strain ◽  
Stress And Strain ◽  
Fe Model ◽  
Stress Strain ◽  
Power Spinning ◽  
In The Beginning ◽  
Distribution Of Stress

In this paper, a reasonable 3D FE model for power spinning of ellipsoidal heads with variable thickness has been established under ABAQUS/Explicit and validated. Then the variation of stress, strain and wall thickness during the process are obtained. Furthermore, the influence of the springback on stress, strain and wall thickness are gained with ABAQUS/Standard. The results show the following: (1) In the beginning, large stress, large strain and the thinning zone of wall thickness localize at the small contact zone below the roller; Then the zone extends into a ring and moves towards the position behind the roller; In the end, the ring transfers to the contact zone below the roller again and becomes uneven. The thinning zone is gradually impelled along the generatrix direction, and wall thickness is getting smaller and smaller. (2) The distribution of stress becomes more even after the springback, while the springback has little effect on the distribution of strain and wall thickness.

3-D FEM Analysis of Large-Scale Prestressed Concrete Aqueduct in the Middle Route of South-to-North Water Diversion Project

2012 ◽  
Vol 212-213 ◽  
pp. 899-903
Author(s):  
Chong Yang Zheng ◽  
Hui Peng ◽  
Nan Hui Li ◽  
Ya Ting Kang
Keyword(s):  
Prestressed Concrete ◽  
Large Scale ◽  
Fem Analysis ◽  
Water Diversion ◽  
Stress And Strain ◽  
Long Span ◽  
Water Diversion Project ◽  
North Water ◽  
Control Section ◽  
Distribution Of Stress

Taking the properties of aqueduct in the middle line of the South-North Water Diversion Project, such as high flow, long span, large load and cross section and so on, two schemes about layout of prestressed steel strands are put forward. In order to guarantee safety of the project and structural optimization, 3-D FEM is adopted to study the regularity of distribution of stress and strain on control section under each condition of the two schemes. The results show that the design of steel strands in the first scheme (wavy steel strands) is much more reasonable and meets the requirements for anti-crack and deflection of the aqueduct body.

Testing and FEM Analysis of Geogrid-Reinforced Retaining Wall's Earth Pressure

2013 ◽  
Vol 405-408 ◽  
pp. 96-100
Author(s):  
Peng Lv ◽  
Guang Qing Yang ◽  
Jie Liu
Keyword(s):  
Retaining Wall ◽  
Earth Pressure ◽  
Fem Analysis ◽  
Filling Material ◽  
In Situ Test ◽  
Weight Density ◽  
Numerical Result ◽  
Reinforced Retaining Wall ◽  
Main Factor

Earth pressure is the main factor for retaining walls stability. To study the distribution regulation of earth pressure in geogrid-reinforced retaining wall, in-situ test has been carried out on an experimental wall and analyzed by finite element method. The numerical result fits well with the test data that prove the reliability, the paper analyze the influence for earth pressure distribution caused by factors of geogrid as: stiffness; length; spacing, and the weight density of filling material.

scholarly journals Numerical Analysis of the Bond Strength between Two Methacrylic Polymers by Surface Modification

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3927
Author(s):  
Joanna Taczała ◽  
Katarzyna Rak ◽  
Jacek Sawicki ◽  
Michał Krasowski
Keyword(s):  
Numerical Analysis ◽  
Bond Strength ◽  
Angular Position ◽  
Fem Analysis ◽  
Groove Depth ◽  
Chemical Reagent ◽  
Shear Process ◽  
3D Geometry ◽  
The Right ◽  
Artificial Teeth

The creation of acrylic dentures involves many stages. One of them is to prepare the surfaces of artificial teeth for connection with the denture plates. The teeth could be rubbed with a chemical reagent, the surface could be developed, or retention hooks could be created. Preparation of the surface is used to improve the bond between the teeth and the plate. Choosing the right combination affects the length of denture use. This work focuses on a numerical analysis of grooving. The purpose of this article is to select the shape and size of the grooves that would most affect the quality of the bond strength. Two types of grooves in different dimensional configurations were analyzed. The variables were groove depth and width, and the distance between the grooves. Finally, 24 configurations were obtained. Models were analyzed in terms of their angular position to the loading force. Finite element method (FEM) analysis was performed on the 3D geometry created, which consisted of two polymer bodies under the shear process. The smallest values of the stresses and strains were characterized by a sample with parallel grooves with the grooving dimensions width 0.20 mm, thickness 0.10 mm, and distance between the grooves 5.00 mm, placed at an angle of 90°. The best dimensions from the parallel (III) and cross (#) grooves were compared experimentally. Specimens with grooving III were not damaged in the shear test. The research shows that the shape of the groove affects the distribution of stresses and strains. Combining the selected method with an adequately selected chemical reagent can significantly increase the strength of the connection.

scholarly journals Design and Application of an In Situ Test Device for Rheological Characteristic Measurements of Liquefied Submarine Sediments

2021 ◽  
Vol 9 (6) ◽  
pp. 639
Author(s):  
Hong Zhang ◽  
Xiaolei Liu ◽  
Anduo Chen ◽  
Weijia Li ◽  
Yang Lu ◽  
...  
Keyword(s):  
Yellow River ◽  
Rheological Characteristic ◽  
Yellow River Delta ◽  
Turbidity Currents ◽  
Rheological Characteristics ◽  
Submarine Landslides ◽  
Test Device ◽  
Offshore Area ◽  
In Situ Test

Liquefied submarine sediments can easily lead to submarine landslides and turbidity currents, and cause serious damage to offshore engineering facilities. Understanding the rheological characteristics of liquefied sediments is critical for improving our knowledge of the prevention of submarine geo-hazards and the evolution of submarine topography. In this study, an in situ test device was developed to measure the rheological properties of liquefied sediments. The test principle is the shear column theory. The device was tested in the subaqueous Yellow River delta, and the test results indicated that liquefied sediments can be regarded as “non-Newtonian fluids with shear thinning characteristics”. Furthermore, a laboratory rheological test was conducted as a contrast experiment to qualitatively verify the accuracy of the in situ test data. Through the comparison of experiments, it was proved that the use of the in situ device in this paper is suitable and reliable for the measurement of the rheological characteristics of liquefied submarine sediments. Considering the fact that liquefaction may occur in deeper water (>5 m), a work pattern for the device in the offshore area is given. This novel device provides a new way to test the undrained shear strength of liquefied sediments in submarine engineering.

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