Biomechanical Structural Effect of Pinball Region Contact Applied to a Finite Element Model of Human Foot

2019 ◽  
Author(s):  
Agustín Vidal-Lesso ◽  
Carlos Lara-Velázquez ◽  
Javier Bayod-López ◽  
Ricardo Becerro de Bengoa Vallejo ◽  
Natali Mancera Campos
Keyword(s):  
Finite Element ◽  
Finite Elements ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Structural Effect ◽  
Contact Radius ◽  
Three Dimensional Model ◽  
Human Foot ◽  
Contact Parameters

Abstract Developing a finite element model of the human foot to analyze the numerical effect of the contact between its bones can also help to understand the complex biomechanics of this member. Therefore, in this work, a three-dimensional model of finite elements of the foot is developed, in order to determine the contact radius between each pair of bones, which help to achieve an adequate distribution of body weight and be able to perform a correct characterization of the biomechanical effect of the foot. In the finite element model developed in this work, the cartilage was replaced by the pair of contact between two bodies (bones) and was simplified to the bony and ligamentous system. It was observed that the radius of the contact sphere of the pinball region has a great impact on the distribution of reactions with the ground (GRF) and the general behavior of the simulation. By varying the contact parameters, it was possible to reduce the error of the results obtained by the simulation with respect to those obtained experimentally up to a value of less than 5%; emphasizing the importance of checking the contact parameters before continuing with a simulation of finite elements.

scholarly journals Analysis of historical structures by using finite element method in Iznik Yeşil Mosque

2019 ◽  
Vol 5 (4) ◽  
pp. 121
Author(s):  
Aykut Uray ◽  
Hasan Selim Şengel ◽  
Serdar Çarbaş
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Soil Survey ◽  
Three Dimensional Model ◽  
Historical Structures ◽  
Model Study ◽  
Non Destructive ◽  
The Finite Element Model

In this study, non-destructive tests and laboratory tests were carried out in order to determine the material properties in Iznik Yeşil Mosque, Iznik District, Bursa Province. For the purpose of determining the soil characteristics of the building, the soil survey studies conducted in the Iznik Yeşil Mosque area were investigated. The finite element model was formed by making a three dimensional model study of the structure. With the finite element model, static analysis, modal analysis and behavioral spectrum analysis were performed under vertical loads in order to collect data for the damaged areas of the structure.

Finite element buckling analysis of laminated composite sandwich panels with transversely flexible core carrying attached elastic strip

2012 ◽  
Vol 14 (6) ◽  
pp. 715-733
Author(s):  
Karamat Malekzadeh Fard ◽  
Alireza Sayyidmousavi ◽  
Zouheir Fawaz ◽  
Habiba Bougherara
Keyword(s):  
Finite Element ◽  
Finite Elements ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Sandwich Panels ◽  
Element Model ◽  
Attached Mass ◽  
Element Analysis ◽  
The Core ◽  
The Face

In this article, a three-dimensional finite element model is proposed to study the effect of distributed attached mass with thickness and stiffness on the buckling instability of sandwich panels with transversely flexible cores. Unlike the previous works in the literature which have made use of unified displacement theories, the present model uses different types of finite elements to model the core and the face sheets. It utilizes shell elements for the face sheets and three-dimensional solid elements for the core which enables the model to account for the transverse flexibility of the structure. The motions of the face sheets and the core as well as the attached mass are related through defining constraint equations between the nodes of their respective finite elements based on the concept of master and slave nodes which is incorporated into the finite element analysis program ANSYS through a user-defined subroutine. The validated finite element model is then used to study the effects of size, thickness, material property, aspect ratio, and the position of the attached mass on the buckling load of a sandwich panel under different combinations of boundary conditions. The results presented in this study have hitherto not been reported in the literature.

Crushing of a Steel Tube Umbilical (STU) Cable During Laying Operation: A Finite Element Method Assessment at the Entry/Exit Regions of Tensioner Shoes

2020 ◽  
Author(s):  
William C. Guttner ◽  
Caio C. P. Santos ◽  
Celso P. Pesce
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Strain Curve ◽  
Element Model ◽  
Steel Tube ◽  
Gas Production ◽  
Three Dimensional Model ◽  
Steel Tubes ◽  
Umbilical Cable

Abstract Umbilical cables are fundamental equipment used in deep and ultra-deep waters oil and gas production systems. The complexity of this kind of structure leads structural analysis to be currently performed with numerical tools. This paper presents a nonlinear three-dimensional finite element model of a typical armored Steel Tube Umbilical Cable (STU) subjected to crushing loads imposed to the umbilical cable during laying operation. The study focuses on the analysis of the stress distribution in the steel tubes at caterpillar shoes, mainly at the entry/exit transition regions. With the use of a commercial software, the finite element model is constructed, considering geometric and materials nonlinearities. Crushing loads are imposed by two rigid plates. Focus is given on the duplex tubes, with the material stress-strain curve modeled from a specific crushing experiment with a single tube and by using a classic Ramberg-Osgood fitting. Firstly, comparisons at mid-length of the three-dimensional model are made with the results from a simpler and planar finite element model. Then, the localized three-dimensional effects are analyzed. The results show a considerable increase of the stress levels in the steel tubes at these transition regions, with the occurrence of stress field redistribution after the onset of plastic deformation.

Finite element model–based evaluation of tissue stress variations to fabricate corrective orthosis in feet with neutral subtalar joint

2016 ◽  
Vol 41 (2) ◽  
pp. 157-163
Author(s):  
Sathish Paul ◽  
Rekha Vijayakumar ◽  
Lazar Mathew ◽  
Sudesh Sivarasu
Keyword(s):  
Computed Tomography ◽  
Finite Element ◽  
Finite Element Model ◽  
Subtalar Joint ◽  
Three Dimensional ◽  
Element Model ◽  
Neutral Position ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Computed Tomography Images

Background: The subtalar joint position during static stance is a crucial determinant of the peak plantar pressures and forms ideal reference point for any intervention in foot-related problems for leprosy-affected patients. Objectives: The study pursued the hypothesis through a three-dimensional model that stress will be minimal in the distal joints of the foot when the subtalar joint is in neutral static stance position. Study design: Finite element model. Methods: The computed tomography images of the feet for five patients suffering from Hansen’s disease having no muscle weakness and joint restriction were acquired. The gray intensities corresponding to the bones of the foot from the computed tomography images were three-dimensionally reconstructed. The three-dimensional model of the human foot, incorporating the realistic geometry, and the material properties of the hard tissues were then analyzed using a finite element solver for the stress distribution on bones of the foot. Results: The results demonstrate that the position of the calcaneum in the static stance position does contribute to the varying stress in the foot. Conclusion: The stresses in the bones of the foot are minimal while the subtalar is in neutral position; this position will be suitable for foot orthotic fabrication. Clinical relevance The clinicians, therapists, and podiatrists having less engineering skills can quickly assess the patient and get optimal results on the stress associated with the joints of the foot.

scholarly journals Comparison of Hertzian and JKR theories with a finite element model in boundary lubrication conditions between a compression ring and a cylinder

2018 ◽  
Vol 188 ◽  
pp. 04009
Author(s):  
Kyriakos Grigoriadis ◽  
Anastasios Zavos ◽  
Pantelis G. Nikolakopoulos
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Combustion Engine ◽  
Three Dimensional ◽  
Element Model ◽  
Elastic Model ◽  
Three Dimensional Model ◽  
Dry Conditions ◽  
The Common ◽  
Lubrication Conditions

This study focuses on the creation of an isothermal elastic model to highlight, through stresses, the occurrence of plastic deformation in certain crank angles under extreme dry conditions inside an internal combustion engine. The stresses that are exported from this analysis are pointing out not only the necessity for an elastoplastic model to be created, but also the importance of predicting the correct friction coefficient, as pointed out by both the contact surface stress and those in depth of the two bodies in contact. A comparison between two coefficients of frictions and one frictionless case is conducted. The comparison between the finite element model and the adhesion mathematical model of Johnson, Kendall and Roberts (JKR), seals the importance of the interaction forces, acting on the common solid surface, in the pursuit of defining a propriate contact patch. Furthermore, a three-dimensional model is proposed for further investigation, highlighting the importance of modelling surface’s micro asperities for a solid stress analysis.

Research on the Key Technologies for Establishing the Finite Element Model of a Gyro-Stabilized Platform

2015 ◽  
Vol 742 ◽  
pp. 603-607
Author(s):  
Xiu Li Yang ◽  
Lin Jing Qin ◽  
Feng Xiao Huang ◽  
Wen Jing Guo
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Mode Analysis ◽  
Finite Element Models ◽  
Three Dimensional Model ◽  
Modeling And Analysis ◽  
Stabilized Platform ◽  
The Finite Element Model

The gyro-stabilized platform is one of the key parts of a guidance weapon. The structure performance of a platform influences the accuracy and reliability of the guidance weapon straightly. In order to reduce development cost and time, the structural modeling and analysis of gyro stabilized platform is very necessary. UG software is applied to establish the three-dimensional model of a platform firstly. And then some components are simplified using MSC Patron. According to the different connection mode between the components, some appropriate connecting elements are applied to establish the finite element model of the platform. In order to meet the special requirements of individual components, appropriate materials are selected so that the finite element model is closer to the actual situation which ensures the reliability of mode analysis and optimized computing results. The work in this paper provides reference for establishment of the similar structure finite element models.

Finite Element Simulation on Stress of Steel Sphere Shell

2012 ◽  
Vol 532-533 ◽  
pp. 297-300
Author(s):  
Chang Li Song ◽  
Jing Ji
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Steel Sphere ◽  
Element Simulation ◽  
Good Agreement

In order to verify correctness of two-dimensional axisymmetric finite element model, this paper carries out axial symmetry analysis of the steel ball shell by ANSYS software and 2-D finite element model is established. The radial and tangential stress distribution is acquired, through comparison with the theoretical solution, both are in good agreement. So it is feasible to simulate the three-dimensional model by finite element axisymmetrical two-dimensional model.

Torsional Analysis of a Steel Cord-Rubber Tire Belt Structure

1996 ◽  
Vol 24 (4) ◽  
pp. 339-348 ◽  
Author(s):  
R. M. V. Pidaparti
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structures ◽  
Three Dimensional ◽  
Element Model ◽  
Torsional Stiffness ◽  
Element Analysis ◽  
Rubber Belt ◽  
Steel Cord ◽  
Torsional Analysis

Abstract A three-dimensional (3D) beam finite element model was developed to investigate the torsional stiffness of a twisted steel-reinforced cord-rubber belt structure. The present 3D beam element takes into account the coupled extension, bending, and twisting deformations characteristic of the complex behavior of cord-rubber composite structures. The extension-twisting coupling due to the twisted nature of the cords was also considered in the finite element model. The results of torsional stiffness obtained from the finite element analysis for twisted cords and the two-ply steel cord-rubber belt structure are compared to the experimental data and other alternate solutions available in the literature. The effects of cord orientation, anisotropy, and rubber core surrounding the twisted cords on the torsional stiffness properties are presented and discussed.

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