National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Use of finite element method for stress evaluation in layers for optical applications
Tesařová, Anežka ; Ohlídal, Miloslav (referee) ; Burša, Jiří (advisor)
This thesis is concerned with the mechanical stress generated in thin layers applied on a substrate. The application takes place at high temperatures and due to different coefficients of thermal expansion of materials, the sample is deformed, and thereby the stress is generated. The first part of the thesis includes the derivation of the Stoney formula for uniaxial and biaxial stress in a layer. Besides, analytical calculations of the normal stress in the layer for the simplified link model, and shear stress on the layer interface were evaluated. The main part of the work consists of solving the problem using FEM modeling. Because the actual temperature behavior during the application was not known, a fictitious temperature load was used as an input. For the samples, the coefficients of thermal expansion of the layer were then searched so that the thermal load resulting deflection corresponds to the experimental data. Three types of models were created, namely the link body model, the axisymmetric model, and the solid model. The axisymmetric model was used for the calculation of samples forming circular isolines during deformation and a volume model for samples forming elliptical isolines. The result of the FEM calculations was the normal stress in the applied layers, for which corresponding relationships were created using regression analysis.
An application of the boundary element method to some elasticity problem
Tesařová, Anežka ; Hlavička, Rudolf (referee) ; Profant, Tomáš (advisor)
This thesis is concerned with the Boundary element method. This is one of the numerical methods used to solve some problems of the mechanics, which are described by partial diffrential equations. The goal of this thesis is to formulate the Boundary element method for the plane problem and then apply the gained knowledge to a particular case.

See also: similar author names
1 TESAŘOVÁ, Angelika
6 Tesarová, Anna
1 Tesařová, Adéla
5 Tesařová, Alena
6 Tesařová, Anna
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