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The Tensile Test of Tubes
Janda, Luděk ; Císařová, Michaela (referee) ; Peterková, Eva (advisor)
The present thesis deals with the tensile test of tube samples and verifies the possibilities of obtaining the corresponding material characteristics. In this work, a total of 3 types of tube samples made according to ČSN EN 10002-1were investigated. For the experiments, longitudinally welded tubes made of 17 240 steel were selected. The used tube was marked as a thin-walled one. Tensile tests were performed on 22 the samples, namely 8 samples on samples having a form of a cut-off of a full cross section tube, 10 samples a strip of segment cross section and a 4 samples transverse cut-out of tube. The goal of thesis was to validate options of acquiring material characteristics, value of deformation hardening exponent ,,n,, and material characteristic ,,C,, of tube samples. Further examination was aimed at designating which shape of sample tubes used for tension test is most suitable. And behaviour of individual samples was examined with tensile load applied. Tension tests were conducted on hydraulic test machine ZD40.
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Conditions of failures generation when bending profiled tubes
Fišar, Luboš ; Peterková, Eva (referee) ; Samek, Radko (advisor)
The thesis describes the knowledge from a round tube bending technology, as a description of conventional and unconventional devices. There are technological parameters in relation to the creation of defects, and equations for determining the bending moment. These knowledge has been generalized and applied to solution the changes of cross-section shape and thickness in the bending of square cross-section. The solution was implemented to specific component (20x2 mm steel tube with two successive radii R57,2 and R131,5). The results of experiments shows that the material is almost rigid-perfectly plastic, in the most stressed areas has a sufficient supply of material formability. Thickness measurement was applied to calculate the approximate center of gravity changes. This shows a shift of 1.4 mm, which is negligible value for the pure bending. The end of the thesis summarizes the deficiencies of current manufacturing technology, which used mandrel is inadequate, wrong located and poor lubrication.
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Conditions of failures generation when bending profiled tubes
Fišar, Luboš ; Peterková, Eva (referee) ; Samek, Radko (advisor)
The thesis describes the knowledge from a round tube bending technology, as a description of conventional and unconventional devices. There are technological parameters in relation to the creation of defects, and equations for determining the bending moment. These knowledge has been generalized and applied to solution the changes of cross-section shape and thickness in the bending of square cross-section. The solution was implemented to specific component (20x2 mm steel tube with two successive radii R57,2 and R131,5). The results of experiments shows that the material is almost rigid-perfectly plastic, in the most stressed areas has a sufficient supply of material formability. Thickness measurement was applied to calculate the approximate center of gravity changes. This shows a shift of 1.4 mm, which is negligible value for the pure bending. The end of the thesis summarizes the deficiencies of current manufacturing technology, which used mandrel is inadequate, wrong located and poor lubrication.
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|
|
The Tensile Test of Tubes
Janda, Luděk ; Císařová, Michaela (referee) ; Peterková, Eva (advisor)
The present thesis deals with the tensile test of tube samples and verifies the possibilities of obtaining the corresponding material characteristics. In this work, a total of 3 types of tube samples made according to ČSN EN 10002-1were investigated. For the experiments, longitudinally welded tubes made of 17 240 steel were selected. The used tube was marked as a thin-walled one. Tensile tests were performed on 22 the samples, namely 8 samples on samples having a form of a cut-off of a full cross section tube, 10 samples a strip of segment cross section and a 4 samples transverse cut-out of tube. The goal of thesis was to validate options of acquiring material characteristics, value of deformation hardening exponent ,,n,, and material characteristic ,,C,, of tube samples. Further examination was aimed at designating which shape of sample tubes used for tension test is most suitable. And behaviour of individual samples was examined with tensile load applied. Tension tests were conducted on hydraulic test machine ZD40.
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