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The use of small punch tests for materials with a higher level of structural inhomogeneity
Gordiak, Michal ; Řehořek, Lukáš (referee) ; Válka, Libor (advisor)
Master's thesis deals with evaluating applicability of correlation relationships between material characteristics determined by Small Punch Test and standard tensile test for material AlSi7Mg0,6 manufactured by casting and technology SLM. Results of Small Punch Tests are correlated with yield strength, tensile strength, elongation, and Young's modulus of elasticity. For each material characteristic various correlation methods are compared, while for each method corresponding coefficients are determined. Consequently, the applicability of individual methods is evaluated by substituting coefficients determined by various studies. Primarily analyzed are correlation methods for which future normalization is expected. The results of master's thesis show that structural inhomogeneity caused by SLM process does not result in high inaccuracies in determining material characteristics. Larger impact on material characteristics has high porosity, which was identified in cast material and led to significant deviations in evaluating tensile strength and elongation.
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Methods of hydrogen charging of steels for an experimental purposes
Gordiak, Michal ; Němec, Karel (referee) ; Válka, Libor (advisor)
Bachelor thesis deals with the issue of hydrogen charging. The first part of the thesis describes individual methods, by which experimental materials are charged with hydrogen today. There are also included results of hydrogen charging experiments available in literature, achieved by described methods. The second part of the thesis is focused on techniques for analyzing hydrogen in metals and measuring surface or overall concentration of hydrogen in specimens.
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The use of small punch tests for materials with a higher level of structural inhomogeneity
Gordiak, Michal ; Řehořek, Lukáš (referee) ; Válka, Libor (advisor)
Master's thesis deals with evaluating applicability of correlation relationships between material characteristics determined by Small Punch Test and standard tensile test for material AlSi7Mg0,6 manufactured by casting and technology SLM. Results of Small Punch Tests are correlated with yield strength, tensile strength, elongation, and Young's modulus of elasticity. For each material characteristic various correlation methods are compared, while for each method corresponding coefficients are determined. Consequently, the applicability of individual methods is evaluated by substituting coefficients determined by various studies. Primarily analyzed are correlation methods for which future normalization is expected. The results of master's thesis show that structural inhomogeneity caused by SLM process does not result in high inaccuracies in determining material characteristics. Larger impact on material characteristics has high porosity, which was identified in cast material and led to significant deviations in evaluating tensile strength and elongation.
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|
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Methods of hydrogen charging of steels for an experimental purposes
Gordiak, Michal ; Němec, Karel (referee) ; Válka, Libor (advisor)
Bachelor thesis deals with the issue of hydrogen charging. The first part of the thesis describes individual methods, by which experimental materials are charged with hydrogen today. There are also included results of hydrogen charging experiments available in literature, achieved by described methods. The second part of the thesis is focused on techniques for analyzing hydrogen in metals and measuring surface or overall concentration of hydrogen in specimens.
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