Finite Element Analysis of the Rubber of the Prosthetic Knee Joint

2014 ◽  
Vol 607 ◽  
pp. 346-349
Author(s):  
Ying Liu ◽  
Xiu Feng Zhang ◽  
Yan Ma
Keyword(s):  
Finite Element ◽  
Nonlinear Problems ◽  
Element Model ◽  
Element Analysis ◽  
Rubber Material ◽  
Knee Motion ◽  
Prosthetic Knee ◽  
Rubber Bearing ◽  
Highly Nonlinear ◽  
Selection Of

Rubber played a buffer role in prosthetic knee motion. Rubber bearing is a very complicated process, and rubber material itself is nonlinear. ABAQUS software can able to deal with highly nonlinear problems. Input rubber test data in ABAQUS, selection of constitutive model, and then the finite element model is established, which is calculated, finally obtains compression under different loads.

A Study on Predictable Model of Waterproofing for Mobile Phone Using Finite Element Analysis Based on Evaluation of Seal Rubber

2012 ◽  
Author(s):  
Hojin Jeon ◽  
Hyongwon Seo ◽  
Myunghan Kim ◽  
Jungyoul Kim
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Model ◽  
Mobile Phone ◽  
Mobile Phones ◽  
Evaluation Method ◽  
Element Model ◽  
Element Analysis ◽  
Rubber Material ◽  
Behavior Characteristics

Recently, product manufacturers of mobile phone have to meet to high demands that allow their products endure variable bad environments exposed throughout the customers’ use. Especially, mobile phones need to resist to high humidity and general waterproofing that is prevalent in everyday usage. However, most previous studies related to seal material or methods for sealing assembly have been focused on heavy industry or automotive industry. In this paper, the aim is to predict waterproof possibility of mobile phone by using finite element analysis in design step. The criteria of waterproof condition for mobile phones was based on IEC60529 IPX-7 level[1]. This paper studied behavior characteristics and properties of the specialized rubber material for sealing the mobile phone housing. Constitutive equation for specialized seal rubber material was applied to the 3rd order Ogden function. Then, the correlation with test and finite element model was studied. Using the correlated finite element model for specialized seal rubber, evaluated behavior characteristics for seal rubber 2D shape and studied waterproof possibility analysis 3D model of mobile phone. The proposed suggestion is expected to predict waterproof possibility for mobile phone efficiently. Evaluation method of 2D finite element model will be useful for decision design specification of seal rubber shape at preceding design step. And evaluation method of 3D finite element model will predict waterproof possibility before tooling the mold and will save the costs at development step in industry.

Post-Buckling Analysis of Axially Functionally Graded Three-Dimensional Beams

2015 ◽  
Vol 07 (03) ◽  
pp. 1550047 ◽  
Author(s):  
Şeref Doğuşcan Akbaş
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Nonlinear Problems ◽  
Element Model ◽  
Buckling Analysis ◽  
Functionally Graded ◽  
Highly Nonlinear ◽  
Lagrangian Finite Element ◽  
Post Buckling

Post-buckling analysis of an axially functionally graded (AFG) cantilever beam subjected to an axial nonfollower compression load is studied in this paper by using the total Lagrangian finite element model of three-dimensional continuum approximations. Material properties of the beam change in the axial direction according to a power-law function. In this study, finite element model of the beam is constructed by using total Lagrangian finite element model of three-dimensional continuum for an eight-node quadratic element. It is known that post-buckling problems are geometrically nonlinear problems. The considered highly nonlinear problem is solved by using incremental displacement-based finite element method in conjunction with Newton–Raphson iteration method. There is no restriction on the magnitudes of deflections and rotations in contradistinction to von-Karman strain displacement relations. The obtained results are compared with the published results. In this study, the effects of the material distribution on the post-buckling response of the AFG beam are investigated in detail. The differences between of material distributions are investigated in the post-buckling analysis. Numerical results show that the above-mentioned effects play a very important role on the post-buckling responses of the beam, and it is believed that new results are presented for post-buckling of AFG beams which are of interest to the scientific and engineering community in the area of FGM structures.

Finite element analysis and experimental investigation of nonlinear features of rail fastening systems

2017 ◽  
Vol 232 (3) ◽  
pp. 873-894
Author(s):  
Y Liu ◽  
HP Yin ◽  
Y Luo ◽  
J Zhang
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Element Analysis ◽  
Rubber Material ◽  
Nonlinear Properties ◽  
Dimensional Finite Element ◽  
Nonlinear Features ◽  
Displacement Force ◽  
Three Dimensional Finite Element

The more demanding requirements for the reduction of vibration in passenger railways and urban railway lines have led to a trend towards lower-stiffness rail fastening systems accompanied by greater deformation of their rubber components. Nonlinearities under large deformation due to the boundary conditions, geometric properties, intrinsic hyperelasticity and viscidity of the rubber material, and dynamic nonlinear features such as the Payne effect have become prominent and cannot be ignored. In this research, a shear-type fastening system and a bonded compression-type rail fastening system have been designed and produced using the same rubber material. A set of mechanical experiments of the used rubber material was first performed to obtain the rubber properties; this information was later used as an input to a three-dimensional finite element model constructed using Abaqus. Laboratory tests of the two fastening specimens were then performed to obtain the quasi-static and dynamic displacement–force curves. Later, the three-dimensional finite element models were presented, and the calculated curves were compared to the measured values. Finally, the two fastening systems were comparatively analyzed, and the influences of their various nonlinear properties were discussed. The combined experimental and numerical analyses of the nonlinear properties of the two typical types of rail fastening systems are believed to enhance the understanding of their mechanical behavior and to improve the product design, structural optimization, and testing in practice.

Stresses and Strains in the Medial Meniscus of an ACL Deficient Knee under Anterior Loading: A Finite Element Analysis with Image-Based Experimental Validation

2005 ◽  
Vol 128 (1) ◽  
pp. 135-141 ◽  
Author(s):  
Jiang Yao ◽  
Jason Snibbe ◽  
Michael Maloney ◽  
Amy L. Lerner
Keyword(s):  
Finite Element ◽  
Ex Vivo ◽  
Element Model ◽  
Shear Stresses ◽  
Element Analysis ◽  
Knee Motion ◽  
Tissue Properties ◽  
Meniscal Tissue ◽  
Acl Deficient ◽  
Deficient Knee

The menisci are believed to play a stabilizing role in the ACL-deficient knee, and are known to be at risk for degradation in the chronically unstable knee. Much of our understanding of this behavior is based on ex vivo experiments or clinical studies in which we must infer the function of the menisci from external measures of knee motion. More recently, studies using magnetic resonance (MR) imaging have provided more clear visualization of the motion and deformation of the menisci within the tibio-femoral articulation. In this study, we used such images to generate a finite element model of the medial compartment of an ACL-deficient knee to reproduce the meniscal position under anterior loads of 45, 76, and 107N. Comparisons of the model predictions to boundaries digitized from images acquired in the loaded states demonstrated general agreement, with errors localized to the anterior and posterior regions of the meniscus, areas in which large shear stresses were present. Our model results suggest that further attention is needed to characterize material properties of the peripheral and horn attachments. Although overall translation of the meniscus was predicted well, the changes in curvature and distortion of the meniscus in the posterior region were not captured by the model, suggesting the need for refinement of meniscal tissue properties.

Crane Wheel-Rail Contact Stresses Research Based on Experimental Test and Finite Element Analysis

2014 ◽  
Vol 496-500 ◽  
pp. 662-665 ◽  
Author(s):  
Feng Qi Wu ◽  
Jin Zhang ◽  
Wen Qing Yao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Theoretical Calculation ◽  
Contact Stress ◽  
Element Model ◽  
Complex Problem ◽  
Element Analysis ◽  
Highly Nonlinear ◽  
Before And After ◽  
Calculation Results

The wheel-rail contact is a boundary condition highly nonlinear complex problem, which need to accurately track the wheel-rail movement and the interaction contact stress between wheel-rail before and after the occurrence of wheel-rail contact, nonlinear contact stress of wheel-rail is analyzed through the contrast of finite element analysis and the actual detection, the experimental and theoretical calculation results show the compliance of the finite element model of wheel-rail, at the same time also point out some differences of theoretical calculation and actual manufacturing, which establish the theoretical and experimental foundation for the advanced research movement friction etc..

Structural Modifications of Excavator’s Bucket Wheel by the Use of Numerical Methods

2010 ◽  
Vol 165 ◽  
pp. 330-335 ◽  
Author(s):  
Eugeniusz Rusiński ◽  
Przemysław Moczko ◽  
Paweł Kaczyński
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Analysis ◽  
Numerical Methods ◽  
Structural Component ◽  
Element Model ◽  
Element Analysis ◽  
Structural Modifications ◽  
Geometrical Form ◽  
Selection Of

In this paper the character of loads exerted on bucket wheel was evaluated. The places of maximal stresses were determined by using finite element analysis. After this operation, a new wheel hub design was initiated. The first phase was related to development of new conceptions of the hub. The proposed conceptions were rated with respect to mass and total length of welds. This procedure led to selection of the most suitable design, which was optimized in order to minimize stress. The work at this stage consisted of continuous modification of the geometrical form, meshing of finite element model and structural analysis thereby providing information about stresses and deformations. The workmanship of the structural component and welded joints were defined according to DIN 22261 2:2006 standard.

Finite Element Analysis and Experimental Study on Rubber Waveform Generator

2011 ◽  
Vol 117-119 ◽  
pp. 1629-1632
Author(s):  
Jun Qi Qin ◽  
Yu Liang Yang ◽  
Chang Chun Di ◽  
Shou Qiang Guan
Keyword(s):  
Finite Element ◽  
Impact Test ◽  
Constitutive Models ◽  
Element Model ◽  
Waveform Generator ◽  
Element Analysis ◽  
Rubber Material ◽  
Strain Relationship ◽  
Hyperelastic Model ◽  
Relationship Of

Rubber waveform generators are widely used in impact test devices for generating shock waves. Through stretching and compressing rubber specimens, obtain the stress-strain relationship of rubber material. Build finite element model of rubber waveform generator, get the maximum static deformation and static stiffness in different forms of constitutive models and take actual tests of rubber waveform generator. Compare finite element results with the actual test results, select Arruda-Boyce model as rubber hyperelastic model. This study lay a good foundation for the design of rubber waveform generators and study of dynamic characteristics of impact test devices.

КОНСТРУКТИВНО-ТЕХНОЛОГІЧНІ ОСОБЛИВОСТІ ХВОСТО-ВИХ БАЛОК СІТЧАСТОГО ТИПУ З ПОЛІМЕРНИХ КОМПО-ЗИЦІЙНИХ МАТЕРІАЛІВ ВЕРТОЛЬОТІВ ТРАНСПОРТНОЇ КАТЕГОРІЇ

2020 ◽  
pp. 15-30
Author(s):  
А. Г. Гребеников ◽  
И. В. Малков ◽  
В. А. Урбанович ◽  
Н. И. Москаленко ◽  
Д. С. Колодийчик
Keyword(s):  
Finite Element ◽  
Strain State ◽  
Layer Structure ◽  
Metal Structure ◽  
Element Model ◽  
Stress Strain ◽  
Element Analysis ◽  
Mesh Structure ◽  
Stress Strain State ◽  
Mesh Structures

The analysis of the design and technological features of the tail boom (ТB) of a helicopter made of polymer composite materials (PCM) is carried out.Three structural and technological concepts are distinguished - semi-monocoque (reinforced metal structure), monocoque (three-layer structure) and mesh-type structure. The high weight and economic efficiency of mesh structures is shown, which allows them to be used in aerospace engineering. The physicomechanical characteristics of the network structures are estimated and their uniqueness is shown. The use of mesh structures can reduce the weight of the product by a factor of two or more.The stress-strain state (SSS) of the proposed tail boom design is determined. The analysis of methods for calculating the characteristics of the total SSS of conical mesh shells is carried out. The design of the tail boom is presented, the design diagram of the tail boom of the transport category rotorcraft is developed. A finite element model was created using the Siemens NX 7.5 system. The calculation of the stress-strain state (SSS) of the HC of the helicopter was carried out on the basis of the developed structural scheme using the Advanced Simulation module of the Siemens NX 7.5 system. The main zones of probable fatigue failure of tail booms are determined. Finite Element Analysis (FEA) provides a theoretical basis for design decisions.Shown is the effect of the type of technological process selected for the production of the tail boom on the strength of the HB structure. The stability of the characteristics of the PCM tail boom largely depends on the extent to which its design is suitable for the use of mechanized and automated production processes.A method for the manufacture of a helicopter tail boom from PCM by the automated winding method is proposed. A variant of computer modeling of the tail boom of a mesh structure made of PCM is shown.The automated winding technology can be recommended for implementation in the design of the composite tail boom of the Mi-2 and Mi-8 helicopters.

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.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

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