Národní úložiště šedé literatury Nalezeno 36 záznamů.  1 - 10dalšíkonec  přejít na záznam: Hledání trvalo 0.00 vteřin. 
Acta Polytechnica CTU Proceedings 7
Kytýř, Daniel ; Zlámal, Petr
The International Symposium on Experimental Methods and Numerical Simulation in Engineering Sciences continues the tradition of the Czech-German bilateral symposium founded by prof. Karl-Hans Laermann and prof. Stanislav Holý in 1985. In the following years, the symposium was extensively developed by prof. Josef Jíra. The symposium shall bring together mainly young scientists who are actively involved in experimental solid mechanics, theoretically and practically, in order to exchange experience, to report on the present state-of-art as well as on running research projects, to discuss due questions and problems and to promote the co-operation between individuals as well as between institutions. Therefore in the symposium discussions will play a highly significant role.
Semi-automated assessment of micromechanical properties of the metal foams on the cell-wall level
Krčmářová, Nela ; Šleichrt, J. ; Doktor, T. ; Kytýř, Daniel ; Jiroušek, O.
Metal foams are innovative porous material used for wide range of application such as\ndeformation energy or sound absorption, filter material, or microbiological incubation carrier. To predict mechanical properties of the metal foam is necessary to precisely describe elasto–plastic properties of the foam on cell–wall level. Indentation with low load is suitable tool for this purpose.\nIn this paper custom designed instrumented microindentation device was used for measurement of cell-wall characteristics of two different aluminium foams (ALPORAS and ALCORAS). To demonstrate the possibility of automated statistical estimation of measured characteristics the device had been enhanced by semi-automatic indent positioning and evaluation procedures based on user-defined grid. Vickers hardness was measured on two samples made from ALPORAS aluminium foam and one sample from ALCORAS aluminium foam. Average Vickers hardness of ALPORAS foam was 24.465 HV1.019 and average Vickers hardness of ALCORAS was 36.585 HV1.019.
Deformation behaviour of gellan gum based artificial bone structures under simulated physiological conditions
Krčmářová, N. ; Šleichrt, J. ; Fíla, Tomáš ; Koudelka_ml., Petr ; Kytýř, Daniel
The paper deals with investigation of deformation behaviour of gellan gum (GG) based\nstructures prepared for regenerative medicine purposes. Investigated material was synthesized as porous spongy-like scaffold reinforced by bioactive glass (BAG) nano-particles in different concentrations. Deformation behavior was obtained employing custom designed experimental setup. This device equipped with bioreactor chamber allows to test the delivered samples under simulated physiological conditions with controlled flow and temperature. Cylindrical samples were subjected to uniaxial quasi-static loading in tension and compression. Material properties of plain scaffold buffered by 50 wt% and 70 wt% BAG were derived from a set of tensile and compression tests. The results are represented in form of stress-strain curves calculated from the acquired force and displacement data.
Time lapse tomography of fracture progress in silicate-based composite subjected to the loading a combination with acoustic emission scanning
Kumpová, Ivana ; Kytýř, Daniel ; Fíla, Tomáš ; Veselý, V. ; Trčka, T. ; Vopálenský, Michal ; Vavřík, Daniel
The initiation and propagation of a fracture in quasi-brittle materials (such as silicatebased composite) is an increasingly discussed topic for which various methods of research have been developed/applied. As the quasi-brittle silicate-based composite compounds are very non-homogenous, the mechanism of the crack initiation and propagation can be very different even for samples with the\nidentical geometry. One possible approach to study the fracture mechanism in quasi-brittle materials is to use several different experimental techniques in a single experiment and perform detail analysis to identify generally valid fracture process phenomena. In this work, a simultaneous monitoring of fracture\nprocess zone formation and propagation by three different methods is presented and discussed. A three point bending test was performed on a notched silicate composite specimen. During the loading process, a highly accurate force displacement dependence was recorded accompanied with X-ray radiography,\nX-ray computed tomogra-phy and acoustic emission scanning.
Book of abstracts. International symposium on experimental methods and numerical simulation in engineering sciences 2016
Kytýř, Daniel ; Zlámal, Petr ; Jiroušek, O.
The International Symposium on Experimental Methods and Numerical Simulation in Engineering Sciences continues the tradition of the Czech-German bilateral symposium founded by prof. Karl-Hans Laermann and prof. Stanislav Holý in 1985. In the following years, the symposium was extensively developed by prof. Josef Jíra. The symposium shall bring together mainly young scientists who are actively involved in experimental solid mechanics, theoretically and practically, in order to exchange experience, to report on the present state-of-art as well as on running research projects, to discuss due questions and problems and to promote the co-operation between individuals as well as between institutions. Therefore in the symposium discussions will play a highly significant role.
XIVth Youth symposium on Experimental Solid Mechanics
Major, Z. ; Kytýř, Daniel
The Youth Symposium on Experimental Solid Mechanics traditionally brings together young researchers and engineers, students and PhD students, who are actively involved in the experimental solids mechanics, theoretically and practically, in order to exchange their experience, to report on the present state-of-art as well as on running research projects, to discuss due questions and problems and to promote the cooperation among individuals as well as among institutions. The XIVth symposium continues both, the long tradition of this conference series and introduces novel elements. The combination of the experimental mechanics with modern numerical methods was focused. This year, participants from 12 countries attended the symposium. Based on their presentations, 19 papers were selected for the publication in this issue of Acta Polytechnica CTU Proceedings.
Identification of damaged zones in C/PPS specimens subjected to fatigue loading based on high-resolution thermography
Koudelka_ml., P. ; Kytýř, Daniel ; Fenclová, Nela ; Šperl, Martin
In this study high resolution thermography is used for identification of damaged zones in Carbon fiber/polyphenylene sulfide (C/PPS) long fiber composite specimens with induced impact damage subjected to tensile fatigue loading. Image processing techniques were applied on thermographs from all loading cases to obtain segmented images of the damaged location that were then used for\ncalculation of the heated area. Results show that the considered method can be used to identify heated area in the vicinity of damage with high confidence at low number of cycles where no significant fatigue effect is present in the material.
Experimentální stanovení creepových vlastností a chování při uniaxiálním namáhání materiálu C/PPS vyrobeného z pelet
Kytýř, Daniel ; Fíla, Tomáš ; Šleichrt, Jan ; Fenclová, Nela
Primárním úkolem zprávy je popis creepového chování sady vzorků vyrobených z peletek po inovaci výrobní technologie. Pro měření deformací byla použita primárně bezkontaktní optická metoda doplněna lokální tenzometrií. Pro popis creepového chování vzorků byl použit Findleyho model.
Experimental study of tile grout material behavior
Kumpová, Ivana ; Kloiber, Michal ; Ševčík, Radek ; Kytýř, Daniel
Study provides preliminary results of experimental study of tile grout material behavior. Experiments were performed with the use of microCT, three point bending test and methods for chemical analysis. It was proven that material behave very elastic and the suitability of the combination of used methods.
On the X-ray micro-tomography measurements of biological samples under compressive loading
Fíla, T. ; Kumpová, Ivana ; Zlámal, Petr ; Kytýř, Daniel ; Koudelka_ml., Petr ; Doktor, Tomáš ; Jiroušek, Ondřej
In this paper, compact loading device for micro-CT measurements under applied load was used in a series of instrumented compressive test of bone sample. Tested bone samples were loaded in several deformation steps and micro-CT scanning was carried out in each step. Reconstructed three-dimensional data of intact bone sample were used to develop 3D model of the specimen. Data from each deformation step were processed by DVC method for identification of displacement and strain fields and thus for evaluation of deformation response of human trabecular bone sample.

Národní úložiště šedé literatury : Nalezeno 36 záznamů.   1 - 10dalšíkonec  přejít na záznam:
Viz též: podobná jména autorů
Chcete být upozorněni, pokud se objeví nové záznamy odpovídající tomuto dotazu?
Přihlásit se k odběru RSS.