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Development of the HSBT tensile impact test equipment
Pech, Vladimír ; Harant, Martin (referee) ; Jopek, Miroslav (advisor)
The thesis is focused on the design of a device for tensile impact tests based on the Hopkinson's split bar principle. The theoretical part describes the behaviour of materials under dynamic loading conditions and a description of the testing methods used. The thesis describes in detail the Hopkinson tensile test and different design variants of this device, including their principle, advantages and disadvantages. In the practical part of the thesis is designed the testing device and the individual parts of the device are analyzed. For the key parts, the selection of materials and geometric parameters is described to ensure the proper functionality of the device. The constructed device is tested by samples made from PETG material. Capacitive sensors and strain gauges were used to record data during the test to verify the correct functionality of the device.
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Dynamic models of material in metal forming
Kudláčová, Barbora ; Šlais, Miroslav (referee) ; Forejt, Milan (advisor)
The aim of the Diploma Thesis is to discuss the creation of material models for the forming technology in quasi-static and dynamic loading conditions and to practically propose a methodology of modeling the mechanical behavior of the selected material for dynamic load conditions using the Split Hopkinson Tensile Bar Test. The presented work contains an overview and analysis of individual experimental methods with the influence of the strain rate in terms of the extent of their suitability, the analysis of the plastic deformation mechanism, an overview of the mathematical mechanical behavior models for the materials used for technological practice and the evaluation of the mechanical behavior of stainless steel according to ČSN 41 7348 in terms of flat formability incl. evaluation of microstructure, fractographic analysis and evaluation of results from ferromagnetism measurement of steel after dynamic loading.
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Dynamic models of material in metal forming
Kudláčová, Barbora ; Šlais, Miroslav (referee) ; Forejt, Milan (advisor)
The aim of the Diploma Thesis is to discuss the creation of material models for the forming technology in quasi-static and dynamic loading conditions and to practically propose a methodology of modeling the mechanical behavior of the selected material for dynamic load conditions using the Split Hopkinson Tensile Bar Test. The presented work contains an overview and analysis of individual experimental methods with the influence of the strain rate in terms of the extent of their suitability, the analysis of the plastic deformation mechanism, an overview of the mathematical mechanical behavior models for the materials used for technological practice and the evaluation of the mechanical behavior of stainless steel according to ČSN 41 7348 in terms of flat formability incl. evaluation of microstructure, fractographic analysis and evaluation of results from ferromagnetism measurement of steel after dynamic loading.
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