Determination of the stiffness properties of a complex RF MEMS by superposition and finite elements method

2019 ◽  
Vol 25 (7) ◽  
pp. 2561-2569
Author(s):  
M. Cihat Yilmaz ◽  
Sadettin Orhan
Keyword(s):  
Finite Elements ◽  
Rf Mems ◽  
Finite Elements Method ◽  
Stiffness Properties

Determination of residual stresses in disk keyways by the finite-elements method

1982 ◽  
Vol 14 (7) ◽  
pp. 865-867
Author(s):  
B. A. Kravchenko ◽  
V. G. Fokin ◽  
G. N. Gutman
Keyword(s):  
Finite Elements ◽  
Residual Stresses ◽  
Finite Elements Method

scholarly journals Modelling of Powered Roof Support Cooperation with the Floor of Low Bearing Capacity in the aspect of Shaping the Section Design

2017 ◽  
Vol 62 (1) ◽  
pp. 177-188
Author(s):  
Józef Markowicz ◽  
Sylwester Rajwa ◽  
Stanisław Szweda
Keyword(s):  
Computer Simulation ◽  
Finite Elements ◽  
Bearing Capacity ◽  
Pressure Distribution ◽  
Finite Elements Method ◽  
Factors Influencing ◽  
Section Design ◽  
Simplifying Assumptions ◽  
Roof Support

Abstract The problem of cooperation of powered roof support with the floor in the aspect of shaping its design is presented. From the analysis of the simplifying assumptions considered so far in the methods for determination of roof support’s base pressure on the floor, it results that they are not satisfied in the case of bases of the catamaran type, commonly used in currently manufactured roof supports. Model of cooperation of the base lying on the floor, prepared by the finite elements method is described and the results of computer simulation of the base action on the floor are given. Considering the results of numerical analyses, the factors influencing the pressure distribution of the base on the floor as well as its maximal value, have been identified.

scholarly journals Determination of Stresses and Forces on the Orthodontic System by Using Numerical Simulation of the Finite Elements Method

2012 ◽  
Vol 122 (4) ◽  
pp. 659-665 ◽  
Author(s):  
J. Ferčec ◽  
B. Glišić ◽  
I. Šćepan ◽  
E. Marković ◽  
D. Stamenković ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Finite Elements ◽  
Finite Elements Method

Application of the Finite Elements Method for computer simulation of properties of surface layers

2017 ◽  
Vol 2 (86) ◽  
pp. 56-85 ◽  
Author(s):  
A. Śliwa
Keyword(s):  
Computer Simulation ◽  
Finite Elements ◽  
High Speed ◽  
High Speed Steel ◽  
Finite Elements Method ◽  
Strength Analysis ◽  
Surface Layers ◽  
Properties Of Coatings ◽  
Simulation And Modelling

Purpose: The work presents the application of the Finite Elements Method in a computer simulation whose aim is to determine the properties of PVD and CVD coatings on various substrates and to optimise parameters of a laser surface treatment process of surface layers of tool steels. Design/methodology/approach: The article discusses the application of the finite elements method for simulating the determination of stresses and microhardness of Ti+TiN, Ti+Ti(CN) and Ti+TiC coatings obtained in a magnetron PVD process on a substrate of sinter high-speed steel, of Ti/Ti(C,N)/CrN, Ti/Ti(C, N)/(Ti, Al)N, Ti/(Ti, Si)N/(Ti, Si)N, Cr/ CrN/CrN, Cr/CrN/TiN and Ti/DLC/DLC coatings obtained in a PVD and CVD process on magnesium alloys, of graded and monolayer coatings (Ti, Al)N, Ti(C,N) produced with the PVD arc technique on a substrate of sintered carbides, cermets and oxide tool ceramics and tool steel remelted and alloyed with a high-performance diode laser (HPDL). Modeling of stresses was performed with the help of finite element method in ANSYS and MARC environment, and the experimental values of stresses were determined based on the sin2Ψ. Findings: The models presented satisfy the assumed criteria, and they can be applied for the determination of properties of surface layers and optimisation of PVD and CVD processes and laser alloying and remelting. The results of a computer simulation correlate with experimental results. The models developed allow to largely eliminate costly, timeconsuming and specialist experiments which have to be done during investigations for the benefit of computer simulations. Research limitations/implications: To be able to assess the possibility of application of surface layers, a computer simulation of other properties of coatings has to be additionally carried out, and a strength analysis has to be made of other coatings coated onto various substrate materials. Originality/value: value Computer simulation and modelling is an interdisciplinary field necessary for the development of science and technology, enabling to perform direct visualisation of properties, which cannot be identified in experimental observations. The purpose of computer simulation and modelling is to improve the ability to predict results and to optimise solutions.

Methods of Increasing Loadability for the Plastic Cycloidal Gears

2011 ◽  
Vol 490 ◽  
pp. 156-165
Author(s):  
Krzysztof Biernacki
Keyword(s):  
Finite Elements ◽  
Theoretical Analysis ◽  
Finite Elements Method ◽  
Working Pressure ◽  
Load Limit ◽  
Stress And Deformation

The working unit of the hydraulic gerotor machine consists in cycloidal gears. In the paper, ways of increasing the load limit for the plastic cycloidal gears have been presented . The objective has been achieved by means of structural and material methods. The modifications have been introduced on the basis of the theoretical analysis of stress and deformation that are generated in the cycloidals gears while in operation. The analysis has been carried out with the use of the finite elements method. The outcome of the analysis is determination of the maximum working pressure value at which the hydraulic gerotor machines featuring the plastic cycloidal gears can operate.

scholarly journals Finite element modeling of multiple density materials of bone specimens for biomechanical behavior evaluation

2021 ◽  
Vol 3 (9) ◽  
Author(s):  
Sebastián Irarrázaval ◽  
Jorge Andrés Ramos-Grez ◽  
Luis Ignacio Pérez ◽  
Pablo Besa ◽  
Angélica Ibáñez
Keyword(s):  
Finite Elements ◽  
Computational Models ◽  
Reaction Force ◽  
Elastic Stiffness ◽  
Finite Elements Method ◽  
Mechanical Resistance ◽  
Assessment Procedure ◽  
Axial Tomography ◽  
Biomechanical Behavior ◽  
Ct Data

AbstractThe finite elements method allied with the computerized axial tomography (CT) is a mathematical modeling technique that allows constructing computational models for bone specimens from CT data. The objective of this work was to compare the experimental biomechanical behavior by three-point bending tests of porcine femur specimens with different types of computational models generated through the finite elements’ method and a multiple density materials assignation scheme. Using five femur specimens, 25 scenarios were created with differing quantities of materials. This latter was applied to computational models and in bone specimens subjected to failure. Among the three main highlights found, first, the results evidenced high precision in predicting experimental reaction force versus displacement in the models with larger number of assigned materials, with maximal results being an R2 of 0.99 and a minimum root-mean-square error of 3.29%. Secondly, measured and computed elastic stiffness values follow same trend with regard to specimen mass, and the latter underestimates stiffness values a 6% in average. Third and final highlight, this model can precisely and non-invasively assess bone tissue mechanical resistance based on subject-specific CT data, particularly if specimen deformation values at fracture are considered as part of the assessment procedure.

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