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Hybridní lepené spoje kovových a kompozitních materiálů
Jetela, Václav ; Symonov, Volodymyr (oponent) ; Klement, Josef (vedoucí práce)
První část práce s názvem „Hybridní lepené spoje kovových a kompozitních materiálů“ obsahuje popis povrchových úprav adherendů. Rovněž je uveden aktuální ucelený přehled lepidel používaných pro spojování kompozitních a kovových adherendů. Druhá část práce je zaměřena na zkoušky smykové pevnosti hybridních spojů. Byl zkoumán vliv tloušťky adherendu, délky přeplátování a vliv přípravy povrchu na smykovou pevnost spoje. Naměřené závislosti jsou ověřeny FE analýzami s dostatečnou přesností. Poznatky a závěry uvedené v práci je možné využít pro optimální návrh hybridního spoje duralu a kompozitu.
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Topology Optimization of the Hinge on Elastic Foundation
Beruashvili, Vasili ; Symonov, Volodymyr (oponent) ; Löffelmann, František (vedoucí práce)
Deal of this Master’s thesis is to modify original part shape using topology optimization by M.S.C NASTRAN, M.S.C. PATRAN and FUSION 360 software results that will define best fitted and satisfying the operating conditions for defined load and constraint conditions. The part is mounted on an orthotropic plate (sandwich panel). The aim of this thesis is to see the effect of elastic foundation on optimization result. The part will be optimized using different design objectives and constraints. Elastic foundation theoretically will change stiffness and deformation, and this will give the ability to change stresses on the part. Original and modified shape part load capacity will be compared by M.S.C NASTRAN/PATRAN software. After shape optimization, the 3D model has to be prepared for the manufacturing process which will be the most cost-efficient.
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Joining of CFRP and metal parts
Dolinský, Jiří ; Urík, Tomáš (oponent) ; Symonov, Volodymyr (vedoucí práce)
This thesis describes basic principles of joining advanced composites together and also joining advanced composites to metal counterparts. The main goal of this thesis is to come up with suitable solution of the joint between metal hinge and CFRP wing spar for flying car AeroMobil 3,0. For calculation of stress-strain analysis a special analytical method is used, which was performed by means of computer software MATLAB and Excel. Final design of the joint is performed by aid of computer software Autodesk Inventor. Submitted solution is not practically tested, hence it has to be considered as a first approximation of future design.
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Review of manufacturing methods for structural parts from short-fiber polymeric composites and methods for improving their mechanical properties
Starčuk, Zenon ; Löffelmann, František (oponent) ; Symonov, Volodymyr (vedoucí práce)
Short fibre polymeric composites are easier to manufacture than long fibre composites but this comes at the cost of worse mechanical properties (i.e. tensile strength and modulus). There are many ways to manufacture short fibre polymer composites. Most methods don’t require manual labour and the methods are the same or at least very similar to manufacturing polymers. This makes short fibre composites relatively cheap. The mechanical properties of short fibre composites can be improved by aligning the fibres. Throughout the last 60 years multiple methods for aligning the fibres in the matrix have been developed. Most of these proved not to be practical for commercial use, but some of the more recent methods have shown great results; special emphasis is put on those in the respective part of the thesis. Additional two methods for aligning fibres are proposed; one using electric current and the other one a combination of alternating and static magnetic fields.
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Small satellite dispenser structural optimization
Zíka, Jakub ; Symonov, Volodymyr (oponent) ; Popela, Robert (vedoucí práce)
This thesis is focused on stiffness optimization of small satellite carrying structure - the Dispenser. The first chapter is an introduction to the European space activities and also includes a brief technical overview of the European launchers. The second chapter aims to provide the finite element model description, which is used for the optimization, described in more detail in the third chapter. The fourth chapter concludes the thesis with the basic strength verification of the optimized structure.
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Multi-Objective Optimization of Complex Composite Structures with Variable Stiffness
Symonov, Volodymyr ; Halama, Radim (oponent) ; Píštěk, Antonín (oponent) ; Juračka, Jaroslav (vedoucí práce)
The thesis is dedicated to development of a multi-objective optimization methodology for complex composite structures with variable stiffness. A multi-level hybrid optimization algorithm is developed based on a hybrid optimization method with interpolating response surface, a Genetic Algorithm and a one-dimensional optimization. Finite element analysis software MSC Nastran is used for structural analyses. A new Genetic Algorithm and a parallel one-dimensional optimization algorithm based on “Golden section” method are developed for the methodology. The finite element analysis software and the developed optimization algorithms are integrated with help of a commercial optimization software Noesis Optimus by Noesis Solutions. The developed methodology is verified on an example optimization problem. The results of the problem optimization are compared to those obtained using previously developed methodologies.
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Review of manufacturing methods for structural parts from short-fiber polymeric composites and methods for improving their mechanical properties
Starčuk, Zenon ; Löffelmann, František (oponent) ; Symonov, Volodymyr (vedoucí práce)
Short fibre polymeric composites are easier to manufacture than long fibre composites but this comes at the cost of worse mechanical properties (i.e. tensile strength and modulus). There are many ways to manufacture short fibre polymer composites. Most methods don’t require manual labour and the methods are the same or at least very similar to manufacturing polymers. This makes short fibre composites relatively cheap. The mechanical properties of short fibre composites can be improved by aligning the fibres. Throughout the last 60 years multiple methods for aligning the fibres in the matrix have been developed. Most of these proved not to be practical for commercial use, but some of the more recent methods have shown great results; special emphasis is put on those in the respective part of the thesis. Additional two methods for aligning fibres are proposed; one using electric current and the other one a combination of alternating and static magnetic fields.
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