Finite element analysis of soil–steel structures

1983 ◽  
Vol 10 (2) ◽  
pp. 287-294 ◽  
Author(s):  
Hisham Hafez ◽  
George Abdel-Sayed
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Computation Time ◽  
Steel Structures ◽  
Nonlinear Behaviour ◽  
Construction Simulation ◽  
Element Analysis ◽  
Interface Elements ◽  
State Highway ◽  
Strain Relationship

The present paper introduces some improvements in the finite element analysis of soil–steel structures. It applies two-noded spring-type interface elements and accounts for the compaction effects during construction simulation. The analyses are performed in increments using a hyperbolic stress–strain relationship for the nonlinear behaviour of the soil and take into account the shear or tension failure in the soil elements. Also, a combination of constant and compatible linear strain elements for soil is used to increase the accuracy of the analysis around the conduit while keeping the storage requirement and computation time for the numerical solution manageable.The analytical results show satisfactory agreement with those obtained experimentally. They also show that the American Association of State Highway and Transportation Officials (AASHTO) provisions overestimate the thrust due to live load and underestimate the thrust due to dead load. A better comparison is found with the Ontario Highway Bridge Design Code (OHBDC).

Stability analysis of soil–steel structures

1986 ◽  
Vol 13 (3) ◽  
pp. 319-326 ◽  
Author(s):  
Abdelrahim K. Dessouki ◽  
Gerard R. Monforton
Keyword(s):  
Plastic Hinge ◽  
High Stress ◽  
Steel Structures ◽  
Element Analysis ◽  
Interface Elements ◽  
State Highway ◽  
Quadrilateral Elements ◽  
Failure Loads ◽  
Soil Media ◽  
Strain Relationship

A finite element analysis to predict the instability of soil–steel structures is presented. For the steel segment, beam–column elements that accommodate geometric nonlinearity as well as plastic hinge formation are used. Constant and linear strain triangular and quadrilateral elements simulate the soil media in conjunction with spring-type interface elements. A hyperbolic stress–strain relationship models the soil remote from the conduit; an elastoplastic soil model is chosen for regions of high stress gradients above and around the conduit. The formulation is capable of following the initiation and propagation of failure in the soil and its effect on the conduit stability. Analytical failure loads are compared with experimental results and those predicted by the Ontario Highway Bridge Design Code (OHBDC) and the American Association of State Highway and Transportation Officials (AASHTO) specifications.

Aerial Steel Platform Overall Lifting Process and Stress Calculation

2014 ◽  
Vol 681 ◽  
pp. 222-228
Author(s):  
Shou Tao Yao ◽  
Wei Cheng Zhao ◽  
Qun Cheng
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Altitude ◽  
Construction Project ◽  
Steel Structures ◽  
Construction Technology ◽  
Element Analysis ◽  
High Rise ◽  
Project Construction

High-rise super large aerial platform project construction has been a greater danger, How to ensure the quality of components assembled and the safety of the construction project is worthy of study. Through finite element analysis on construction conditions of steel structures, ensures the hydraulic synchronous lifting and construction technology of high-altitude hoisting and assembly, greatly reduced the difficulty of installation, quality, safety, cost, schedule is guaranteed.

scholarly journals Effect of Mesh Density on Finite Element Analysis Simulation of a Support Bracket

2021 ◽  
Vol 6 (3) ◽  
Author(s):  
Nicholas S Gukop ◽  
Peter M Kamtu ◽  
Bildad D Lengs ◽  
Alkali Babawuya ◽  
Adesanmi Adegoke
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Computation Time ◽  
Mesh Size ◽  
High Quality ◽  
Element Analysis ◽  
Fine Mesh ◽  
Finite Element Analysis Simulation ◽  
Mesh Analysis ◽  
Mesh Density

Investigation on the effect of mesh density on the analysis of simple support bracket was conducted using Finite element analysis simulation. Multiple analyses were carried out with mesh refinement from coarse mesh of 3.5 mm to a high-quality fine mesh with element size of 0.35 mm under 15 kN loading. Controlled mesh analysis was also conducted for the same loading. At the mesh size of 0.35 mm, it has a maximum stress value of 42.7 MPa. As the element size was reduced, it was observed that below 1.5 mm (higher mesh density) there was no significant increase in the peak stress value; the stress at this level increased by 0.028 % only. Further decreased of mesh size shows insignificant effect on the stresses and displacements for the high-quality fine mesh analysis. The application of High-quality mesh control analysis showed a significant reduction in the computation time by more than 90%. Regardless of the reduction in computation time, the controlled mesh analysis achieved more than 99% accuracy as compared to high-quality fine mesh analysis. Keywords— Computation time, Finite Element Analysis, Mesh density, Support Bracket.

Finite Element Analysis of Synchronous Belt Tooth Failure

1993 ◽  
Vol 207 (2) ◽  
pp. 145-153 ◽  
Author(s):  
K W Dalgarno ◽  
A J Day ◽  
T H C Childs
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Material Model ◽  
Element Model ◽  
Element Analysis ◽  
Finite Element Program ◽  
Interface Elements ◽  
Dimensional Finite Element ◽  
Element Program ◽  
Critical Strains

This paper describes a finite element analysis of a synchronous belt tooth under operational loads and conditions with the objective of obtaining a greater understanding of belt failure by tooth root cracking through an examination of the strains within the facing fabric in the belt. The analysis used the ABAQUS finite element program, and was based on a two-dimensional finite element model incorporating a hyperelastic material model for the elastomer compound. Contact between the belt tooth face and the pulley groove was modelled using surface interface elements which allowed only compression and shear forces at the contact surfaces. It is concluded that the critical strains in the facing fabric of the belt, and therefore the belt life, are largely determined by the tangential loading condition on the belt teeth.

Evaluation of Hexahedral Mesh Quality for Finite Element Method in Electromagnetics

2010 ◽  
Vol 670 ◽  
pp. 318-324 ◽  
Author(s):  
Y. Motooka ◽  
So Noguchi ◽  
H. Igarashi
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Computation Time ◽  
Poor Quality ◽  
Mesh Quality ◽  
Hexahedral Mesh ◽  
High Quality ◽  
Element Analysis ◽  
Mesh Generator

We have previously proposed an automatic hexahedral mesh generator. It is necessary to understand about the quality and characteristic of the generated mesh to perform hexahedral edge finite element analysis in electromagnetic. Therefore, we have compared high-quality meshes with poor-quality meshes, and investigated about the factors that affect the accuracy and the computation time. In addition, we investigated about the effect of the templates used in the proposed method. We will conclusively apply the result to improving the automatic hexahedral mesh generator.

Hardness prediction of a cold rolled Nimonic 80A exhaust valve spindle

2019 ◽  
Vol 1-2 (94) ◽  
pp. 13-21
Author(s):  
S.W. Kang ◽  
S.J. Heo ◽  
J.H. Yoo ◽  
J.H. Kang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fe Analysis ◽  
Compression Testing ◽  
Hardness Distribution ◽  
Stress Strain ◽  
Element Analysis ◽  
Nimonic 80A ◽  
Strain Relationship ◽  
Cold Rolled

Purpose: of this paper is to predict the hardness of cold rolled exhausts valve spindle fabricated of Nimonic 80A via axisymmetric finite element analysis, compression testing, and hardness inspection. Design/methodology/approach: The stress-strain relationship of Nimonic 80A was obtained via compression testing with deformation ratios of 10%, 20%, and 30%. Hardness changes caused by the strain hardening effect were measured in cut specimens in both the axial and circumferential directions following compression testing. The effective strain at the measurement position was calculated via finite element analysis. The regression equation for hardness changes caused by work hardening was derived from analysed strain and inspected hardness. The cold-rolling deformation of an exhaust valve spindle was analysed using axisymmetric finite element analysis. Findings: The stress-strain relationship calculated from compression testing was well expressed using the Holloman equation and the strain-hardness relationship by strain hardening was successfully regressed using the shifted power law model for Nimonic 80A, Nickel-Chromium based super alloy. Research limitations/implications: This research focused hardness prediction of spindle after ring rolling operation for generating beneficial compressive surface residual stresses for enhancing fatigue life. Further research to quantify compressive residual stress after rolling shall be followed to increase fatigue life. Practical implications: The cold rolling process is a typical incremental forming method and should be analysed under three-dimensional conditions. However, it takes lots of time to solve incremental forming analysis. To predict hardness distribution after rolling in the manufacturing field, FE analysis was performed under two-dimensional axisymmetric conditions based on the assumption of no friction generated by the rolling tool. The deformed shapes and hardness distribution from the inspection quality standard and two-dimensional FE analysis showed very similar results. Simplified finite element analysis method for ring rolling process for local area could be very effective method in the industrial field. Originality/value: The stress-strain relationship and the hardness and strain relationship were derived by compression test and hardness measurement for compressed specimen for Nimonic 80A, Nickel-Chromium based super alloy. And simplified finite element analysis method was suggested to predict deformed shape and hardness distribution of locally cold rolled region and achieved similar result between FE analysis result and Quality standard. Suggested method would be very effective method to engine spindle manufacture to predict hardness of different size of product.

Finite Element Analysis and Empirical Solution for Flexible Substrates Undergoing Large Equibiaxial Strains

2008 ◽  
Author(s):  
Martin Y. M. Chiang ◽  
Tianle Cheng ◽  
Lisa Pakstis ◽  
Juan Taboas ◽  
Joy Dunkers
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Load ◽  
Flexible Substrate ◽  
Applied Pressure ◽  
Element Analysis ◽  
Physical Mechanisms ◽  
Strain Relationship ◽  
Substrate Strain

Studies of cellular mechanobiology have depended heavily on the use of in vitro experiments. Many devices have been developed to probe those basic physical mechanisms responsible for cell culture mechanostimulus. The work reported here uses a system that imparts equibiaxial loading on a flexible substrate, similar to the Bioflex in Flexcell [1] family of products, to study cell response to mechanical load. The objective of this study is to incorporate an adaptive loading algorithm (ALA) in a finite element analysis (FEA) to update loading conditions, to obtain an accurate correlation between the substrate stain and applied pressure in the culture system. There is a good agreement between the strain predicted from the analysis and that from the direct measurement. Also, based on the mechanistic condition of physical constrains and a regression analysis of finite element results, we have developed an empirical formula to predict the pressure-strain relationship for large substrate strain levels (up to 15 %) to circumvent experimental measurement or FEA for the substrate strain. The results from this study can be used to validate experimental observations and provide a framework for advancing the apparatus to next level involving other loading cases and geometries.

THE USE OF ENRICHED HEXAHEDRAL ELEMENTS WITH BUBBLE FUNCTIONS FOR FINITE ELEMENT ANALYSIS

2006 ◽  
Vol 30 (4) ◽  
pp. 495-509
Author(s):  
Shi-Pin Ho ◽  
Yen-Liang Yeh
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Computation Time ◽  
System Of Equations ◽  
Error Norm ◽  
Element Analysis ◽  
Hexahedral Elements ◽  
Static Condensation ◽  
Serendipity Elements

In this paper, the concept that adds the interior nodes of the Lagrange elements to the serendipity elements is described and a family of enriched elements is presented to improve the accuracy of finite element analysis. By the use of the static condensation technique at the element level, the extra computation time in using these elements can be ignored. Three-dimensional elastic problems are used as examples in this paper. The numerical results show that these enriched elements are more accurate than the traditional serendipity elements. The convergence rate of the enriched elements is the same as the traditional serendipity elements. In the numerical example, the error norm of the first order enriched elements can be reduced when compared with the use of the traditional serendipity element, but the computation time is increased a little. The use of enriched second and third order hexahedral elements does not only improve accuracy, but also saves the computation time for solving the system of equations, when the precondition conjugate gradient method is used to solve the system of equations. The saving of computation time is due to the decrease in the number of iteration for the iteration method.

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