Effect of Film Thicknesses of TbFe and SmFe on Magnetostrictions for Micro-Wireless Actuators

2006 ◽  
Vol 326-328 ◽  
pp. 285-288
Author(s):  
Heung Shik Lee ◽  
Chong Du Cho ◽  
Usik Lee
Keyword(s):  
Finite Element ◽  
Magnetic Fields ◽  
Magnetron Sputtering ◽  
Mechanical Characteristics ◽  
Binary Compound ◽  
Fabrication Process ◽  
Finite Element Models ◽  
Silicon Membrane ◽  
Dc Magnetron Sputtering ◽  
Silicon Based

Silicon based magnetostrictive structures were fabricated for micro-wireless actuators, and finite element models were developed to predict mechanical characteristics of the actuated structures. These structures can be used to design wireless micro-vehicles and multi-function packaged micro-devices. In the fabrication process, amorphous magnetostrictive films of the optimized binary compound Tb0.4Fe0.6 and Sm0.47Fe0.53 were deposited with various thicknesses on the silicon membrane by DC magnetron sputtering using cast composite targets. Magnetic fields lower than 2KOe were applied for micro-system applications. These films have been tested in a simple cantilever arrangement and the predicted magnetostrictions of the actuated membranes through the developed FE models have been calculated.

Pole-Vaulting: Identification of the Pole Local Bending Rigidities by an Updating Technique

2008 ◽  
Vol 24 (2) ◽  
pp. 140-148 ◽  
Author(s):  
Julien Morlier ◽  
Michel Mesnard ◽  
Mariano Cid
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Performance Improvement ◽  
Mechanical Characteristics ◽  
Dynamic Structure ◽  
Experimental Results ◽  
The Other ◽  
Finite Element Models ◽  
Model Sensitivity ◽  
Deflection Test

The development of composite material poles since 1960 has played a prominent part in performance improvement in pole-vaulting. Previous studies devoted to pole-vaulting models were based on constant mechanical characteristics. It is thus necessary to identify the local bending rigidities of the pole to build realistic pole-vaulting models. Updating methods developed for dynamic structure studies allow us to describe local mechanical characteristics. These methods are based on the comparison between experimental results and those determined numerically by finite element models. This study presents an adaptation of these methods to determine the local bending rigidities of the pole. The updating technique is validated by a deflection test of a homogeneous beam. Then, a study of the model sensitivity is carried out to investigate the procedure robustness. Finally, the updating method is applied to an old design pole and to a recent one. The results obtained vary greatly from one pole to the other; they highlight the evolutions in pole design.

Designing and Fabricating a PZT Strain Sensor for Soil Applications

2008 ◽  
Author(s):  
Joel Soman ◽  
Chad B. O’Neal
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Mechanical Characteristics ◽  
Strain Sensor ◽  
Fabrication Process ◽  
Maximum Displacement ◽  
Specific Test ◽  
Modeling And Analysis ◽  
Element Modeling ◽  
Maximum Voltage

This research focuses on designing, fabricating, and testing a strain sensor for different soil applications. Using finite element modeling and analysis, the initial dimensions of the diaphragm were designed, and a diaphragm diameter of 1.35 cm with a thickness of 300 μm was chosen. The fabrication process of the sensor prototype is discussed in this paper along with the design for specific test benches to test the electrical and mechanical characteristics at different stages of fabrication. Displacement tests on the sensor diaphragm were performed and the corresponding voltages produced were tabulated. A maximum displacement of 250 μm was achieved producing a maximum voltage of 7.3 mV. The voltage produced by the sensor was recorded using LabVIEW, and its values were tabulated and plotted against corresponding displacement and strain magnitudes.

Numerical simulation of plasma confinement in DC magnetron sputtering under different magnetic fields and anode structures

2014 ◽  
Vol 53 (8) ◽  
pp. 088001 ◽  
Author(s):  
Junichi Kageyama ◽  
Mamoru Yoshimoto ◽  
Akifumi Matsuda ◽  
Yasuhiko Akao ◽  
Eiji Shidoji
Keyword(s):  
Numerical Simulation ◽  
Magnetic Fields ◽  
Magnetron Sputtering ◽  
Plasma Confinement ◽  
Dc Magnetron Sputtering

Analysis on Mechanical Characteristics of Flexible Membranous Disc Coupling

2013 ◽  
Vol 655-657 ◽  
pp. 506-510
Author(s):  
Shang Yang ◽  
Hui Qun Yuan ◽  
Yan Li
Keyword(s):  
Finite Element ◽  
Working Conditions ◽  
Dynamic Characteristics ◽  
Mechanical Characteristics ◽  
Finite Element Models ◽  
Stress Variation ◽  
3D Finite Element ◽  
Harmonic Response ◽  
Design Requirements ◽  
Element Theory

Using the basic finite element theory, 3D finite element models of flexible membranous disc coupling with different disc thickness is built by ANSYS ，and then the dynamic characteristics are analyzed in working conditions. In particular, the analysis of static stress and harmonic response to the thickness of 0.85 model is done for getting the stress variation under a rated condition. The date calculated by dynamic characteristics and stress analysis can satisfy the design requirements. Those researches and analysis provide a theoretical consideration for complex vibration situation of flexible membranous disc coupling and for the improvement and optimization of coupling product.

scholarly journals The problem of mathematical finite element modeling of inhomogeneous deformable solids using scanning

2019 ◽  
Vol 19 (3) ◽  
pp. 281-289
Author(s):  
V. L. Duong
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Strain State ◽  
Mechanical Characteristics ◽  
Finite Element Models ◽  
Mathematical Methods ◽  
Stress Strain ◽  
Computer Tomograph ◽  
Element Modeling ◽  
Deformable Solids

Introduction. In the mathematical finite element modeling, an average value of the mechanical characteristics of the deformable solid material is used. In aircraft, machine building, construction engineering, medicine and other fields, polymer composite materials and materials of natural origin are increasingly used. In the latter case, the actual change in the mechanical characteristics differs significantly from the averaged change; therefore, when using the averaged parameters to build and analyze finite element models, the results can be significantly distorted. This paper describes the creation of mathematical methods for studying changes in the mechanical characteristics of a material of inhomogeneous deformable solids. The results obtained in this way are used to construct finite element models and analyze their stress-strain state.Materials and Methods. Naturally occurring materials and composites are considered as inhomogeneous deformable solids. To study the changes in the mechanical characteristics of the material, a method was developed based on the use of two components: the pixel characteristics of raster images scanned by a computer tomograph and the experimental data of field tests of standard samples.Research Results. A complex of mathematical methods has been developed for modeling the interpretation of scanning raster images by a computer tomograph, which allows for the study of any complicated structures of real deformable solids. The results are used in the construction of finite element models of such bodies considering the heterogeneity of the mechanical characteristics of the material. The analysis of the stress-strain state of finite element models of test samples has proved the accuracy and convergence of the numerical solution of the finite element method in modeling the property of heterogeneity of the mechanical characteristics of the material.Discussion and Conclusions. The developed approach can be applied to any physical principles of scanning (X-ray, ultrasound, laser, etc.) and for any types of materials if the data obtained as a result of scanning is developed in the form of a digital (raster) image.

A Finite Element Analysis of the General Rolling Contact Problem for a Viscoelastic Rubber Cylinder

1988 ◽  
Vol 16 (1) ◽  
pp. 18-43 ◽  
Author(s):  
J. T. Oden ◽  
T. L. Lin ◽  
J. M. Bass
Keyword(s):  
Finite Element ◽  
Variational Principles ◽  
Standing Waves ◽  
Rolling Contact ◽  
Finite Element Models ◽  
Viscoelastic Cylinder ◽  
Element Analysis ◽  
Elastic Rubber ◽  
Frictional Effects ◽  
Rough Foundation

Abstract Mathematical models of finite deformation of a rolling viscoelastic cylinder in contact with a rough foundation are developed in preparation for a general model for rolling tires. Variational principles and finite element models are derived. Numerical results are obtained for a variety of cases, including that of a pure elastic rubber cylinder, a viscoelastic cylinder, the development of standing waves, and frictional effects.

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