National Repository of Grey Literature 50 records found  previous11 - 20nextend  jump to record: Search took 0.01 seconds. 
Evaluation of Fracture Mechanical Parameters for Bi-Piezo-Material Notch
Hrstka, Miroslav ; Materna, Aleš (referee) ; Náhlík, Luboš (referee) ; Profant, Tomáš (advisor)
Předkládaná dizertační práce se zabývá stanovením hlavních členů Williamsova asymptotického rozvoje popisujícího rovinné elektro-elastické pole v okolí piezoelektrických bi-materiálových vrubů a trhlin na rozhraní za použití rozšířeného Lechnického-Eshelbyho-Strohova formalismu v návaznosti na čistě anizotropní pružnost. Je ukázáno, že rozšířený Lechnického-Eshelbyho-Strohův formalismus představuje spolu s moderními programovacími koncepty v jazyku Python efektivní a také praktický nástroj pro lomovou analýzu piezoelektrických bi-materiálů. Teoretická část práce popisuje aspekty anizotropní pružnosti a její návaznost na piezoelektrické materiály. Základní rovnice zaměřené na speciální typy monoklinických materiálů, které umožňují oddělení rovinného a anti-rovinného problému, jsou vyjádřeny pomocí komplexních potenciálů. V praktické části práce je sestaven problém vlastního hodnot pro bi-materiálový vrub, na jehož základě jsou stanoveny exponenty singularity a pomocí dvoustavového -integrálu také zobecněné faktory intenzity napětí. Veškeré vztahy a numerické procedury jsou následně rozšířeny na problém piezoelektrických bi-materiálových vrubů a podrobně prozkoumány v uvedených příkladech. Zvláštní pozornost je věnována přechodu asymptotického řešení téměř zavřených vrubů a trhlin na rozhraní. Vliv směru polarizace na asymptotické řešení je také zkoumán. Přesnost stanovení zobecněných faktorů intenzity napětí je testována srovnáním asymptotického řešení a řešení získaného pomocí metody konečných prvků s velmi jemnou sítí konečných prvků. Na závěr je formalismus modifikován pro nepiezoelektrické materiály.
Optimization of sliding gate profiles
Gajdůšek, Tomáš ; Profant, Tomáš (referee) ; Fuis, Vladimír (advisor)
This thesis deals with stress and strain analysis of real self-supporting sliding gate produced by company Technopark CZ. s.r.o. In the first part of work is analyzed theory, which is used for calculations. In computational part is created model of self-supporting sliding gate and then analytically solves deformations and stresses in this model. The analytical solution is verified by the numerical solution in Ansys. At the end of the thesis are evaluated the knowledge and created the optimal dimensioning of the profiles.
Problems of the complex potentials of the isotropic elasticity
Kubíček, Radek ; Hrstka, Miroslav (referee) ; Profant, Tomáš (advisor)
The presented diploma thesis concerns linear fracture mechanics and deals with determination of the stress intensity factor of the finite crack, which is located in the vicinity of the bimaterial interface, solved by the distributed dislocation technique and theory of complex potencials. The work is possible to devide into three parts. The first part includes basic concepts of the linear fracture mechanics and is also dedicated to the mechanics of composite materials. The second part deals with the determination of the stress intensity factor from solving singular integral equation formulated by Bueckner's principle and the distributed dislocation technique. The third part includes the specific configuration of the crack with respect to the bimaterial interface and the solution, which is compared with results obtained from the FE analysis.
A study of the stress distribution near the sharp notch tip
Svoboda, Petr ; Majer, Zdeněk (referee) ; Profant, Tomáš (advisor)
The presented diploma thesis deals with the problem of determining the stress singularity exponent of the V-notch. This task can be divided into two parts. The first deals with the theoretical background, that means the basic relations of mechanics and the basic concepts of fracture mechanics. The second part deals with the elaboration of the Williams method and the creation of a program for calculating the stress singularity exponent.
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.
Elasticity problems in Python language
Tichoň, Dušan ; Žák, Stanislav (referee) ; Profant, Tomáš (advisor)
This bachelor thesis deals with the programming language Python. Its aim is acquaintance of NumPy, SymPy and Matplotlib libraries and their later application. Also it shows the great computing potential of programming language in creating exercises which will be used and presented for educational purposes.
An application of Python language to some problems of the mechanics
Horák, Filip ; Lošák, Petr (referee) ; Profant, Tomáš (advisor)
Programming language Python is currently a very powerful and widely used programming tool. Its availability, simplicity and versatility makes it a popular choice among both beginners and experienced programmers. Although Python is not primarily designed for calculations, it is easy to program a calculator software when proper libraries are used. The aim of this bachelor thesis is to get to know the Python programming language, to apply it to chosen tasks of mechanics and to present the results using the Jupyter web application.
A study of the stress distribution near the sharp notch tip
Beňo, Tomáš ; Žák, Stanislav (referee) ; Profant, Tomáš (advisor)
This bachelor’s thesis is studying problems of stress distribution near the sharp notch tip. The theoretical part discloses the history of fracture mechanics and it’s basic principles. The practical part solves stress singularity exponents for geometry of particular notch.
Curvature assessment in general point at arterial aneurysms
Pátek, Václav ; Profant, Tomáš (referee) ; Burša, Jiří (advisor)
This bachelor thesis focuses on determining curvatures in generals points of aneurysms, concretly determining principal curvatures in individual points on finite element mesh of idealized abdominal aortic aneurysm.
Significance of tensile stresses in a bended beam with constrained axial deformation
Wolf, Jonatan ; Profant, Tomáš (referee) ; Burša, Jiří (advisor)
Bachelor’s thesis deals with the significance of tension stresses produced by the bending of a beam with avoided longitudinal deformation. This problem is mainly solved by exact calculations of tensile stresses for different kinds of geometry, materials and the size lateral loads of the beam. The solution is done numerically using the MATLAB program. The result of this work is the assessment of tensile stress significance and comparison with other stresses, namely temperature stress. One of the partial results of the work is also the determination of the limit value of the slenderness of the beam for the given bending stress for which this tensile stress becomes significant.

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