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Mechanical behaviour of Strenx steel at high strain rates
 Basler, Matěj ; Forejt, Milan (referee) ; Jopek, Miroslav (advisor)
The thesis is focused on the description of the behaviour of high-strength steel Strenx under quasi-static and dynamic conditions with emphasis on the influence of anisotropy. A compression test was used as a low strain rate test with specimens formed from rolled sheet in the 0, 45 and 90 degree directions relative to the rolling direction. The behaviour of the steel at high strain rates was described using the Taylor impact test, again with specimens oriented with respect to the rolling direction. The contour of the deformed specimens from the dynamic test was measured by image analysis and the dynamic yield strength of Strenx steel was calculated. The test results were compared between the loaded directions and the anisotropic behaviour of the material was described. From the values obtained from the performed experiments, the material constants for Johnson-Cook's material model were determined and its reliability was compared with both quasi-static and dynamic test results. The calculated values using the material model achieved satisfactory accuracy and the developed material model can be considered reliable.
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