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A study of the stress field near the stress concentrator at the bi-material interface
Krepl, Ondřej ; Klusák, Jan (referee) ; Profant, Tomáš (advisor)
The aim of this work is the solution of problems of the stress distribution near bimaterial notch tip or eventually the crack impinging orthogonaly the bimaterial interface, determination of stress singularity exponent. The first part is concerned with basics of linear elastic fracture mechanics, i.e. Irwin's concept of stress intensity factor. The second part is devoted to description of anisotropic materials by complex potencial theory. The final part is focused on calculation of eigenvalues of both isotropic and anisotropic materials and application of LES formalism on the calculation of stress singularities of the bimaterial ortotropic notch or the crack impinging orthogonaly the bimaterial interface.
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Fracture Toughness of Metallic Materials and its Testing
Kosek, Lukáš ; Zapletal, Josef (referee) ; Němec, Karel (advisor)
The purpose of the work is to introduce the basic of the fracture toughness of metallic materials and its measuring under the conditions of the plane strain. There are shown essential concepts of the linear elastic fracture mechanics, which is used for the description of the material behavior at fracture of the material with a crack. It defines stress intensity factor and describes the main elements influencing the fracture toughness. Furthermore, the work contains the particular testing methods, specimens and testing equipments. In the conclusion it recapitulates the availability and the application of the linear elastic fracture mechanics.
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Problems of the crack near the bimaterial interface
Svoboda, Miroslav ; Klusák, Jan (referee) ; Profant, Tomáš (advisor)
Subject of this work is resolving problems of linear crack mechanics, description of stress and deformations in the vicinity of the top of the concentrator with plane elasticity theory in orthotropy materials. First part is engaged in basic relations in crack mechanics. Second part is engaged in numeric-analytic algorithm for determination of stress singularity of crack perpendicular to interface of two materials. Third part is focused on testing algorithm on specific configuration of material and tension of crack in bimaterial interface. In the conclusion, numeric results and impact of mechanic qualities of materials with crack perpendicular to their interface are evaluated.
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On the Problems of LEFM of Composite Materials
Kopp, Dalibor ; Profant, Tomáš (referee) ; Klusák,, Jan (advisor)
The objects of this bachelor thesis is to familiarize oneself with the basics of linear elastic fracture mechanics (LEFM) of homogeneous materials and to specify these problems for composite materials. The work is divided into three parts. The first part is aimed at the basics of LEFM. The second part is concerned with generalization of LEFM. The third part is oriented to the numerical application of the studied problems to notches composed of two orthotropic materials.
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Monitoring masonry buildings affected by the surrounding construction
Kirschbaum, Adam ; Heřmánková, Věra (referee) ; Cikrle, Petr (advisor)
This bachelor’s thesis deals with monitoring of a building object affected by a surrounding construction. In the first, theoretical part the defect of wall constructions, ways of measuring wall cracks and possibilities of a static load are described. The second, practical part deals with monitoring of a multi-storey building which was damaged by a building of a neighbouring object in the gap site. It covers the inspection and documentation of the damage and the description of the applied methods. The results of measuring are elaborated graphically and analysed in connection with interventions to the construction.
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Evaluation failures of masonry buildings
Kopecký, Martin ; Stehlík, Michal (referee) ; Cikrle, Petr (advisor)
This bachelor’s thesis deals with an evaluation of defects of masonry buildings. The theoretical part gives a sorting of defects of masonry buildings according to various criteria including types of cracks, defects of brick walls and columns and systems of cracks in masonry buildings with their causes. The pictures with examples of the defects are enclosed. The practical part gives the documentation of a typical failure. This documentation is about uneven subsiding of two different parts of the church of St. James in Brno. The experimental part describes the failure in building „C“ which is the part of the area of Masaryk university, Faculty of Arts. This experimental part is based on the measuring of the deformations. The results of the measuring and photos are included.
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Reinforced concrete aeration tank
Vlach, Jakub ; Strnad, Jiří (referee) ; Šulák, Pavel (advisor)
The aim of this work is to design and static analysis features open embedded aeration tank wastewater treatment plants, in particular the assessment base plate and exterior walls. On the basis of reports is prepared drawings consisting of reinforcement drawings and drawing shapes. The proposal was made on the values of the internal forces of the outputs of computer program SCIA Engineer 2012-Student Edition.
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Brick Building Reconstruction
Kolářová, Jana ; Bažant,, Zdeněk (referee) ; Šulák, Pavel (advisor)
This bachelor’s thesis is focused on reconstruction of brick apartment houses in terms of static load capacity. The thesis summarizes the requirements and information to evaluate the current state of brick buildings, contains both theoretical and practical calculations to assess the load capacity of masonry elements, and suggests possible measures for structures in unsatisfactory conditions.
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Analýza vad vzniklých při strojním ohýbání bukových hranolků
Ondroušková, Jitka
This thesis analyzes the conditions and parameters entering the selected operations while bending beech scantlings. Then it deals with the requirements for the properties and quality of the material. The analysis was performed on the plasticization steaming operation and the bending operation on the bending machine with rotating core. It also describes a clarifies the effect of selected factors on the origin and nature of the defects. The measurements and observations were carried out at the factory Ton plc. The general conclusions confronted with the literature concerned with the topic in the past were inferred in the end of the thesis.
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Simulation of the crack growth in the weld of the polyolefin pipes
Ševčík, Martin ; Hutař, Pavel ; Náhlík, Luboš
The aim of this work was to study the effect of the material properties change due to the butt welding on the stress intensity factor in polyolefin pipe. The gradient change of the Young’s modulus was assumed. The crack was located in the middle of the affected zone. The stress intensity factors estimated in both graded region and basic material (homogenous case) were compared. Strong influence of the graded region on the value of the stress intensity factor was observed. Therefore, for realistic estimation of the welded pipe lifetime the change of the material properties inside the polymer weld should be taken into account.
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