A New 3D Analytical Method for Calculating the Longitudinal Stress-Strain of Bones, as ‘N’ Different Asymmetrical Linear Elastic Materials, Loaded Together Eccentrically

2000 ◽  
Author(s):  
Nader Arafati
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Analytical Method ◽  
Hip Prosthesis ◽  
Three Dimensional ◽  
Elastic Materials ◽  
Stress Strain ◽  
Element Analysis ◽  
Linear Elastic ◽  
The Finite Element Analysis

Abstract We describe a three-dimensional analytical method to evaluate the stress-strain of « n » different asymmetrical linear elastic materials, loaded together by eccentric forces and moments. If one assumes that each bone is composed of a number of different linear elastic materials, this method could be used to determine the stress-strain values of any bone. Mesh generation is unnecessary with this method, the only requirement being to determine the contours of each material. We used this method to analyze the longitudinal stresses imposed on the femur, after implantation of cemented hip prosthesis. The results were compared with those of finite element analysis without any contact elements. Considerable differences were found, particularly for exterior prosthesis contours. When the same error was entered into a cylindrical analytical model, the similar errors were found, indicating that not using contact elements may result in unacceptable errors with the finite element analysis method.

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.

Modeling and experimental verification on directivity of an electret cell array loudspeaker

2012 ◽  
Vol 24 (3) ◽  
pp. 326-333 ◽  
Author(s):  
Yu-Chi Chen ◽  
Wen-Ching Ko ◽  
Han-Lung Chen ◽  
Hsu-Ching Liao ◽  
Wen-Jong Wu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Digital Control System ◽  
Analysis Model ◽  
Cell Array ◽  
Element Analysis ◽  
Finite Element Analysis Model ◽  
The Finite Element Analysis ◽  
Directivity Characteristics

We propose a model to give us a method to investigate the characteristic three-dimensional directivity in an arbitrarily configured flexible electret-based loudspeaker. In recent years, novel electret loudspeakers have attracted much interest due to their being lightweight, paper thin, and possessing excellent mid- to high-frequency responses. Increasing or decreasing the directivity of an electret loudspeaker makes it excellent for adoption to many applications, especially for directing sound to a particular area or specific audio location. Herein, we detail a novel electret loudspeaker that possesses various directivities and is based on various structures of spacers instead of having to use multichannel amplifiers and a complicated digital control system. In order to study the directivity of an electret loudspeaker based on an array structure which can be adopted for various applications, the horizontal and vertical polar directivity characteristics as a function of frequency were simulated by a finite-element analysis model. To validate the finite-element analysis model, the beam pattern of the electret loudspeaker was measured in an anechoic room. Both the simulated and experimental results are detailed in this article to validate the various assertions related to the directivity of electret cell-based smart speakers.

The Finite-Element Analysis of the Main Frame of the Airborne Photoelectric Platform

2012 ◽  
Vol 562-564 ◽  
pp. 1943-1946
Author(s):  
Yong Hu ◽  
Jin Gan Song ◽  
Qing Zou ◽  
Ke Zhu ◽  
Xiao Long Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Weak Links ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Overall Performance ◽  
Sufficient Strength ◽  
Ansys Workbench ◽  
Main Frame

Because both of the volume and the weight of the photoelectric platform are small, the structure of two frames and two axes is used in the photoelectric platform. As the key component of the photoelectric platform, the main frame should have sufficient strength and rigidity. In order to achieve this object, three-dimensional entity model of the main frame is established using CATIA software. Then the finite-element analysis of the model is finished with ANSYS Workbench. Based on the analysis results, the weak links of the main frame is found. Then these links are improved and the main frame is analyzed again. After improving the structure, the results of the finite-element analysis show that the main frame meets the requirements of design and has perfect overall performance.

The Parametric Design and Finite Element Analysis of Wellhead Gate Valve Based on SolidWorks

2014 ◽  
Vol 614 ◽  
pp. 576-579
Author(s):  
Xiu Hua Ma
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Gate Valve ◽  
Parametric Design ◽  
Three Dimensional ◽  
Visual Programming ◽  
Element Analysis ◽  
Programming Tool ◽  
The Finite Element Analysis ◽  
Visual Basic6.0

In this paper, SolidWorks2012 was redeveloped by visual programming tool Visual Basic6.0 to realize the three-dimensional parametric design of wellhead gate valve and the transformation of corresponding engineering drawings on the engineering diagram template. Then the finite element analysis was progressed directly by using the SolidWorks module of the finite element analysis. This can shorten design time of gate valve and improve work efficiency.

Development of Cylinder with Multiple Diagonal Slits for Ultrasonic Longitudinal - Torsional Vibration Turn-Milling

2010 ◽  
Vol 139-141 ◽  
pp. 2291-2294
Author(s):  
Yun Dian Zhang ◽  
Bing Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Electrical Discharge Machining ◽  
Three Dimensional ◽  
Element Analysis ◽  
Three Dimensional Modeling ◽  
The Finite Element Analysis ◽  
Traditional Processing ◽  
Forming Tools ◽  
Analysis Of Error

Cylinder with multiple diagonal slits is one of the core parts of longitudinal-torsional resonance ultrasonic device. Its structure was more complex, the traditional processing processed it very difficult, and the traditional analytical methods were also difficult to make accurate description to system. The paper researched cylinder with multiple diagonal slits using experimental method, analysis of electrical discharge machining forming tools of the slits and three-dimensional modeling; developed cylinder with multiple diagonal slits, analyzed longitudinal-torsional resonance and mechanical properties of cylinder with multiple diagonal slits using finite element analysis method. Tested resonant frequency of cylinder with multiple diagonal slits with precision impedance analyzer. The finite element analysis results compared with tested results, and analysis of error between them, finite element analysis results slightly lower than the test results but the error was within the allowed range. Comparison of results and analysis of error indicated that developed cylinder with multiple diagonal slits meet requirement.

Ladle Transportation Car Frame Finite Element Analysis

2012 ◽  
Vol 591-593 ◽  
pp. 841-844
Author(s):  
Ping Tang ◽  
Chun Hua Pan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Optimization Design ◽  
Mechanical Design ◽  
Three Dimensional ◽  
Electrical Measurement ◽  
Stress And Strain ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
The Finite Element Analysis

Using the mechanical design of the software Solid works to established the 280 t LF the ladle furnace transportation car frame three dimensional model, and by using the finite element analysis of software Cosmos/works to static analysis for the frames, revealing that the frame of structure stress and strain distribution map of the frame, and also reveals that dangerous points and dangerous sections. Using resistance strain gauge to measure 280 t ladle transportation car frame, it is concluded that the frame of stress and strain distributions. Through the electrical measurement test the results were compared with finite element analysis results, further proof that the finite element analysis of the accuracy of the results provides theory basis for the optimization design of the frames.

Micro-Drawing of Circular Cups with Thin Stainless Steel Sheets

2018 ◽  
Vol 920 ◽  
pp. 114-119
Author(s):  
Hong Syuan Su ◽  
Fuh Kuo Chen ◽  
Kun Min Huang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Die Design ◽  
Stress Strain ◽  
Element Analysis ◽  
Steel Sheets ◽  
Grain Sizes ◽  
Multi Stage ◽  
The Finite Element Analysis ◽  
Tooling Design

With the ongoing development of product process, there is a growing demand on micro products. Though the macro-drawing process has been well-developed, the design concepts may not be directly applicable to the micro-drawing due to the size effect occurred in the micro-forming processes. In the present study, experiments were conducted first to establish the stress-strain curves, r-values and work hardening exponents of 304 stainless steel sheets with different grain sizes. The experiment results reveal that the stress-strain and r-value become smaller and the work hardening exponent increases for larger grain sizes. The difference between stress-strain curves in various directions of 0°, 45° and 90°, respectively, is significant when the grain size increases. The stamping of a vibration motor shell of cell phone, which bears a circular cylindrical shape, was also examined in the present study. The finite element simulations were performed to evaluate the formability of the multi-stage drawing process with initial die design. The forming characteristics were identified and an optimum die design was then developed with the use of the finite element analysis. The stamping process with multi-stage tooling design based on the finite element analysis was implemented and the actual stamping experiments were conducted to verify finite element analysis. The experimental results confirm the validity of the modified tooling design and the efficiency of the finite element analysis.

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