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Fracture Toughness of Composite with Al-matrix and Carbon Fibres
Michalička, Jan ; Klement, Josef (referee) ; Molliková, Eva (advisor)
Abstract The objective of this study was a values evaluation of fracture toughness of fiber-metal laminates (FML) compounded from carbon fibers in epoxy matrix and aluminium plates of lay-up 6/5. Samples with unidirectional and bidirectional orientation were tested experimentally. In the case of unidirectionally oriented samples an effect of moisture absorption to epoxy matrix on the values of fracture toughness was reviewed. A fracture toughness calculation was realized by COD method firstly. A bigger pop-ins in F – COD diagram as critical moments for "delta"c evaluation were considered; it was determined by 5% tangential line. It was found out, that results of this measurement weren’t in agreement with plane deformation condition and for this the results couldn’t be rated as fracture toughness "delta"Ic. A method of J integral for fracture toughness evaluation was used consequently. A test of elastic compliance changes before J integral calculation by all of samples was performed. Beginning of stable grow of crack was determined by this method. A critical forces Fc from beginnings were established, which were used for calculation of Jc. A functional dependence of elastic compliance on crack opening had specific waved shape before its linear (up to exponential) grow. It was observed in all cases. The critical forces Fc from the end of “wave” preceding the continual grow of compliance were determined. Equations stated in standards for J integral calculation were used, which are for metal materials normally used. Despite this was found out all of results of Jc were in good agreement with plane deformation condition and could be rated as fracture toughness JIc. In this study were found out these pieces of knowledge about fracture toughness of FML CARE: Unidirectional CARE had fracture toughness JIc about 76 kJ/m^2 and the same type but with bigger amount of absorbed moisture had JIc about 4 % higher. In this case negative moisture influences on CARE weren’t found. Bidirectional CARE had fracture toughness JIc about 31 kJ/m^2; it was about 65 % less then in the case of unidirectional CARE
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Fracture Toughness of Composite with Al-matrix and Carbon Fibres
Michalička, Jan ; Klement, Josef (referee) ; Molliková, Eva (advisor)
Abstract The objective of this study was a values evaluation of fracture toughness of fiber-metal laminates (FML) compounded from carbon fibers in epoxy matrix and aluminium plates of lay-up 6/5. Samples with unidirectional and bidirectional orientation were tested experimentally. In the case of unidirectionally oriented samples an effect of moisture absorption to epoxy matrix on the values of fracture toughness was reviewed. A fracture toughness calculation was realized by COD method firstly. A bigger pop-ins in F – COD diagram as critical moments for "delta"c evaluation were considered; it was determined by 5% tangential line. It was found out, that results of this measurement weren’t in agreement with plane deformation condition and for this the results couldn’t be rated as fracture toughness "delta"Ic. A method of J integral for fracture toughness evaluation was used consequently. A test of elastic compliance changes before J integral calculation by all of samples was performed. Beginning of stable grow of crack was determined by this method. A critical forces Fc from beginnings were established, which were used for calculation of Jc. A functional dependence of elastic compliance on crack opening had specific waved shape before its linear (up to exponential) grow. It was observed in all cases. The critical forces Fc from the end of “wave” preceding the continual grow of compliance were determined. Equations stated in standards for J integral calculation were used, which are for metal materials normally used. Despite this was found out all of results of Jc were in good agreement with plane deformation condition and could be rated as fracture toughness JIc. In this study were found out these pieces of knowledge about fracture toughness of FML CARE: Unidirectional CARE had fracture toughness JIc about 76 kJ/m^2 and the same type but with bigger amount of absorbed moisture had JIc about 4 % higher. In this case negative moisture influences on CARE weren’t found. Bidirectional CARE had fracture toughness JIc about 31 kJ/m^2; it was about 65 % less then in the case of unidirectional CARE
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Project planning web application for SAP NetWeaver Portal
Tyle, Jan ; Šlajchrt, Zbyněk (advisor) ; Michalička, Jan (referee)
The aim of the work is to analyze, design and implement project planning web application, integrated on SAP NetWeaver Portal platform. Although the requirements are based on the needs of Mibcon a.s. company, the resulting application solves the problematics of project management in general. Technologies, used during the implementation are Adobe Flex (user interface), Java (server integration layer) and Oracle database (backend). The reader is introduced to various aspects of portal application development. Representative technical details, used during implementation, are presented here as well.
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Personal and family budget
Michalička, Jan ; Smrčka, Luboš (advisor) ; Zajíc, Ladislav (referee)
The aim of this bachelor work is to bring theoretical and practical knowledges about making up family budget. The work is divided into three parts. First part is about basic principles, that must be adhered in order to make up a family and personal budget. Second part is about theoretical and practical knowledges concerning about the issue of personal portfolio. This part contains comparation of financial products, that can be used by building up a family budget. Second part can be also used as a source for choosing the suitable financial product. Last practical part is about making up a financial plan by using knowledges from previous two parts of the work.
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Influence of SOA on SAP Enterprise Information Systems
Michalička, Jan ; Svatá, Vlasta (advisor) ; Cihlář, Antonín (referee)
This work deals with Service-Oriented Architecture (SOA) and its impact on SAP products. In the first part of the work we are outlining the development of information systems architectures, after that describing SOA architecture, its basic concept, benefits and risks, ways of implementing and other connections. In the next part we are introducing the SAP company and its big historic moments from the beginning till present. We are analyzing the impact of SOA on SAP product and introducing new solutions -- architectural concept Enterprise SOA and application and integration, service-oriented platform SAP NetWeaver. We are discussing its development and its future. In the last part we are demonstrating practically these new solutions.
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