National Repository of Grey Literature 20 records found  1 - 10next  jump to record: Search took 0.01 seconds. 
High strain-rate compressive testing of filling materials for inter-penetrating phase composites
Doktor, T. ; Fíla, T. ; Zlámal, Petr ; Kytýř, Daniel ; Jiroušek, O.
In this study behavior of the selected types of filling material for the inter-penetrating phase composites was tested in compressive loading mode at low and high strain-rates. Three types of the filling material were tested, (i) ordnance gelatin, (ii) low expansion polyurethane foam, and (iii) polyurethane putty. To evaluate their impact energy absorption bulk samples of the selected materials were tested in compression loading mode at strain-rates 1000 s−1 to 4000 s−1. The high strain-rate compressive loading was provided by Split Hopkinson Pressure Bar (SHPB) which was equipped with PMMA bars to enable testing of cellular materials with low mechanical impedance. Based on the comparative measurement response to compression at both low and high strain-rates was analysed. The results show a significant strain-rate sensitivity of the ordnance gelatin and of the polyurethane putty, while strain-rate effect in the polyurethane foam was not observed.
Book of abstracts. XVIIth Youth symposium on experimental solid mechanics
Kytýř, Daniel ; Doktor, Tomáš ; Zlámal, Petr
The YSESM symposium provides a forum for young researchers and engineers, PhD students and students dealing with subjects of experimental mechanics. The Symposium concentrates on current work in all areas of experimental research and its application in solid and fluid mechanics.
Multi-channel control system for in-situ laboratory loading devices
Rada, Václav ; Fíla, Tomáš ; Zlámal, Petr ; Kytýř, Daniel ; Koudelka_ml., P.
In recent years, open-source applications have replaced proprietary software in many fields. Especially open-source software tools based on Linux operating system have wide range of utilization. In terms of CNC solutions, an open-source system LinuxCNC can be used. However, the LinuxCNC control software and the graphical user interface (GUI) could be developed only on top of Hardware Abstraction Layer. Nevertheless, the LinuxCNC community provided Python Interface, which allows for controlling CNC machine using Python programming language, therefore whole control software can be developed in Python. The paper focuses on a development of a multi-process control software mainly for in-house developed loading devices operated at our institute. The software tool is based on the LinuxCNC Python Interface and Qt framework, which gives the software an ability to be modular and effectively adapted for various devices.
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.
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.
Configuration Management
Zlámal, Petr ; Grosmanová, Martina (referee) ; Fiala, Alois (advisor)
This diploma thesis is engaged in identification of configuration object, identification of configuration items and design of configuration management system, which results from ČOS 051605 to ČOS 051611 and was modified according to requirement of Exerion Precision Technology Olomouc, s.r.o., division „Výroba monodílů a podskupin, Olomouc“, Železniční 6, 779 00 Olomouc, Česká republika, focused on configuration management activity „Configuration Identification“ and „Configuration Control – Engineering Changes, Deviations and Waivers“.
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.
On the modelling of compressive response of closed-cell aluminium foams under high-strain rate loading
Koudelka_ml., P. ; Zlámal, Petr ; Fíla, Tomáš
Porous metals and particularly aluminium foams are attractive materials for crash applications where constructional elements have to be able to absorb considerable amount of deformation energy while having as low weight as possible. Compressive behaviour for medium impact velocities can be experimentally assessed from a series of droptower impact tests instrumented with accelerometer and high-speed camera. However to predict such behaviour a proper modelling scheme has to be developed. In this paper droptower impact tests of Alporas aluminium foam were used for development of a material model for explicit finite element simulations of high-strain rate deformation process using LS-DYNA simulation environment. From the material models available low density foam, Fu-Chang’s foam, crushable foam and modified crushable foam models were selected for simulations using smoothed-particle hydrodynamics and solid formulations respectively. Numerical simulations were performed in order to assess constitutive parameters of these models and identify material model describing deformation behaviour of Alporas with the best accuracy.
Proceedings of 13th Youth symposium on experimental solid mechanics
Kytýř, Daniel ; Zlámal, Petr ; Růžička, M.
Proceedings of the 13th Youth Symposium on Experimental Solid Mechanics held in Decin, Czech Republic. The symposium is focused on experimental methods and numerical simulation in engineering sciences. The proceedings capture the trends in development of experimental methods in mechanics of structures and materials (regardless to the material and structure type, covering fields from civil and mechanical engineering to biomechanics) as well as deployment of particular solution for measurement and automation systems for evaluation of experimental data.
Experimental study on size effect in quasi-static compressive behavior of closed-cell aluminium foams
Koudelka_ml., Petr ; Zlámal, Petr ; Kytýř, Daniel ; Fíla, Tomáš ; Jiroušek, Ondřej
The size effect in compressive deformation behaviour of commercially available aluminium closed-cell foam Alporas was studied under quasi-static loading conditions with different boundary conditions. Dimensions of the specimen’s cross-section were selected to match those of sufficient representative volume element (RVE) obtained by spectral analysis of the macroscopic structure whereas different heights of specimens were tested to examine size-scaling factor. Mechanical properties were derived from three different data sources: I) using data captured by load-cell, II) by digital image correlation (DIC) of displacement of contact faces, III) by DIC of the specimen’s structure. Mechanical testing was performed in custom-built loading device as well as in Instron 4301 electromechanical testing system with custom computer control software.

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See also: similar author names
3 Zlamal, P.
3 Zlámal, P.
3 Zlámal, Pavel
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