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Methodology of the measuring of projectile velocity degradation in the ballistic resistant materials
Šperl, Martin; Bejdl, Jan; Wolf, Benjamin; Koutný, O.; Kratochvíl, J.; Bystrianska, E.; Křesťan, J.; Bartošková, M.; Holešinský, R.; Drdlová, M.; Šoukal, F.; Pěchouček, P.
2021 - Czech
The methodology report describe a complete methodology for measuring the decrease of projectile speed in ballistic resistant material, incl. description of the required measuring systems. V práci je vypracována kompletní metodika k měření útlumu rychlosti projektilu v balisticky odolném materiálu vč. popisu potřebných měřících zařízení.
Keywords:
ballistic materials; velocity degradation; concrete; high speed measuring
Available at various institutes of the ASCR
Methodology of the measuring of projectile velocity degradation in the ballistic resistant materials
The methodology report describe a complete methodology for measuring the decrease of projectile speed in ballistic resistant material, incl. description of the required measuring systems.
Ceiling plaster in the Church of Master Jan Hus in Česká Lípa. Plaster in the Stauss system
Válek, Jan; Skružná, Olga; Kozlovcev, Petr; Slížková, Zuzana; Frankeová, Dita; Kotková, Kristýna; Viani, Alberto
2021 - Czech
The studied ceiling plasters were sampled the Mistr Jan Hus Church in Česká Lípa. The material consisted of several layers of paint. The aim of this research was to characterize the individual layers of plaster in the Stauss system. Vzorky pochází z omítky stropní konstrukce kostela Mistra Jana Husa v České Lípě. Omítka se skládá z několika vrstev a nátěrů. Cílem průzkumu je charakterizovat vrstvy tvořící základ omítkového souvrství, které bylo použito ve spojení se stropním systém Stauss.
Keywords:
ceiling plaster; material composition; plaster characterization; Stauss system; Mistr Jan Hus Church Česká Lípa
Available at various institutes of the ASCR
Ceiling plaster in the Church of Master Jan Hus in Česká Lípa. Plaster in the Stauss system
The studied ceiling plasters were sampled the Mistr Jan Hus Church in Česká Lípa. The material consisted of several layers of paint. The aim of this research was to characterize the individual layers ...
Chemical and mineralogical analysis of a mortar sampled from the well in the yard of the object Sedláčkova 15, Pilsen.
Frankeová, Dita; Bauerová, Pavla; Slížková, Zuzana
2021 - Czech
The mortar sample was analyzed using a TGA and SEM-EDS analysis as part of the construction and technical survey. The mortars' aggregate and binder components were analyzed, and the binder was identified as a mixture of soil and lime. Rozbor vzorků historické malty s využitím skenovacího elektronového mikroskopu (SEM‐EDS) a termické analýzy (TGA) analýzy. Charakterizace plniva a složek pojiva malty. Pojivo malty je nehomogenní, tvoří ho především hlinitokřemičitanová zemina (jíly) a vápno.
Keywords:
mortar; SEM‐EDS; TGA
Available at various institutes of the ASCR
Chemical and mineralogical analysis of a mortar sampled from the well in the yard of the object Sedláčkova 15, Pilsen.
The mortar sample was analyzed using a TGA and SEM-EDS analysis as part of the construction and technical survey. The mortars' aggregate and binder components were analyzed, and the binder was ...
Chemical and microstructural characterization of building materials sampled from Kamenička waterwork
Frankeová, Dita; Bauerová, Pavla; Koudelková, Veronika; Slížková, Zuzana
2021 - Czech
Within the construction-technical survey framework, a microscopic analysis of historical concrete samples was performed using a scanning electron microscope and SEM-EDS analysis. Characterization of mortar components, determination of concrete degradation degree, and identification of chemical corrosion products. The results of the survey work were used as a basis for the reconstruction project.\n V rámci stavebně-technického průzkumu byl proveden mikroskopický rozbor vzorků historického betonu s využitím skenovacího elektronového mikroskopu a SEM‐EDS analýzy. Byla provedena charakterizace plniva a složek pojiva malt, určení stupně degradace betonu a identifikace produktů chemické koroze. Výsledky průzkumných prací byly použity jako podklad pro návrh rekonstrukce objektu.\n
Keywords:
material characterization; mortars; concrete
Available at various institutes of the ASCR
Chemical and microstructural characterization of building materials sampled from Kamenička waterwork
Within the construction-technical survey framework, a microscopic analysis of historical concrete samples was performed using a scanning electron microscope and SEM-EDS analysis. Characterization of ...
Characterization of 'brizolit' plasters from Zlín (CR) based on SEM-EDS microscopic analysis
Bauerová, Pavla; Frankeová, Dita; Slížková, Zuzana
2021 - Czech
Composition of the binder and the aggregate components in “Brizolit” plaster using SEM-EDS method. Plaster was sampled from the building façade in Zlín (CR). Výsledky analýzy složení plniva a pojiva metodou SEM-EDS v omítce zvané brizolit odebrané z fasády domu ve Zlíně.
Keywords:
brizolit; SEM-EDS; historic plaster; Portland cement; lime; mortar characterization
Available at various institutes of the ASCR
Characterization of 'brizolit' plasters from Zlín (CR) based on SEM-EDS microscopic analysis
Composition of the binder and the aggregate components in “Brizolit” plaster using SEM-EDS method. Plaster was sampled from the building façade in Zlín (CR).
Mechanical and fracture mechanical analysis of steel segments cut from Družba oil pipelines DN 500 and DN 700
Gajdoš, Lubomír; Šperl, Martin; Šorm, Filip; Bejdl, Jan
2021 - Czech
Experimental research of mechanical and fracture mechanical properties of the pipe specimens taken from Družba oil pipeline. In addition to basic static tests and fracture toughness tests, the research also included the determination of the kinetic of fatigue crack growth, incl. analysis of critical crack size. Experimentální výzkum mechanických a lomově-mechanických vlastností trubních vzorků z ropovodu Družba. Kromě základních statických zkoušek a zkoušek na určení lomové houževnatosti bylo součástí výzkumu i určení kinetiky růstu únavových trhlin vč. analýzy kritické velikosti trhlin.
Keywords:
J integral; pipeline; toughness; crack
Available at various institutes of the ASCR
Mechanical and fracture mechanical analysis of steel segments cut from Družba oil pipelines DN 500 and DN 700
Experimental research of mechanical and fracture mechanical properties of the pipe specimens taken from Družba oil pipeline. In addition to basic static tests and fracture toughness tests, the ...
Microscopic analysis of the mortar sampled from the fortress 'Stary Dvur', Krupka (CZ)
Bauerová, Pavla; Frankeová, Dita; Slížková, Zuzana
2021 - Czech
Chemical and mineralogical composition of the binder and the aggregate of mortar, using electron microscopy and SEM-EDS analysis Chemické a mineralogické složení pojiva a plniva malty pomocí elektronové mikroskopie a SEM-EDS analýzy
Keywords:
SEM-EDS analysis; historic mortar; hydraulic lime; decalcification; carbonatization
Available at various institutes of the ASCR
Microscopic analysis of the mortar sampled from the fortress 'Stary Dvur', Krupka (CZ)
Chemical and mineralogical composition of the binder and the aggregate of mortar, using electron microscopy and SEM-EDS analysis
A partial report on the structural survey of Judith's Tower in Prague 1
Drdácký, Miloš; Eisler, Marek; Zíma, Pavel
2021 - Czech
For the intended restoration of the object, a survey of structures that show faults or for which knowledge of material characteristics is needed for calculations confirming the reliability of the structures was requested. During the implementation of the order, there were difficulties that affected the necessity of its execution in two stages. The user of the tower cooperated with the authors of this report without any problems, and therefore it was possible to carry out the work listed below in the necessary scope and quality. Pro zamýšlené restaurování objektu byl vyžádán průzkum konstrukcí, které vykazují poruchy nebo u nichž znalost materiálových charakteristik je potřebná pro výpočty, potvrzující spolehlivost konstrukcí. Při realizaci objednávky se vyskytly potíže, které ovlivnily nutnost jejího provedení ve dvou etapách. S autory této zprávy uživatel věže spolupracoval bez problémů a proto bylo možno níže uvedené práce provést v potřebném rozsahu a kvalitě.
Keywords:
historical composite masonry; timber frame diagnostics; non-destructive testing; thermal imaging
Available at various institutes of the ASCR
A partial report on the structural survey of Judith's Tower in Prague 1
For the intended restoration of the object, a survey of structures that show faults or for which knowledge of material characteristics is needed for calculations confirming the reliability of the ...
Numerical solution of a stochastic model of a ball-type vibration absorber
Fischer, Cyril; Náprstek, Jiří
2021 - English
The mathematical model of a ball-type vibration absorber represents a non-linear differential system which includes non-holonomic constraints. When a random ambient excitation is taken into account, the system has to be treated as a stochastic deferential equation. Depending on the level of simplifcation, an analytical solution is not practicable and numerical solution procedures have to be applied. The contribution presents a simple stochastic analysis of a particular resonance effect which can negatively influence efficiency of the absorber.
Keywords:
stochastic model; Monte Carlo method; stochastic Euler method; dynamical systems; non-holonomic system
Available at various institutes of the ASCR
Numerical solution of a stochastic model of a ball-type vibration absorber
The mathematical model of a ball-type vibration absorber represents a non-linear differential system which includes non-holonomic constraints. When a random ambient excitation is taken into account, ...
Aerodynamic wind tunnel testing of U-beams
Hračov, Stanislav; Macháček, Michael
2021 - English
The paper presents the outcomes from the experimental testing of the set of slender U-beams in the climatic wind tunnel. All analysed beams have identical basic geometry with the U-shaped cross section given by the side ratio equal to 2 (having the short side perpendicular to the flow), but they differ in the porosity of their flanges and in the depth of their profile. Two depths of the U-profile combined with six different levels of flange porosity are analysed. The U-beams were tested in the smooth flow in order to determine their aerodynamic coefficients for various angles of wind attack. The influences of the depth and porosity onto these coefficients are studied in detail. Moreover, the susceptibility of each individual case to transversal galloping is assessed based on the classical quasi-steady theory. The comparison with the results from the aerodynamic tests of the prisms with rectangular cross-sections having side rations equal to two, four and six is also given and discussed.
Keywords:
wind tunnel testing; aerodynamic coefficients; galloping
Available at various institutes of the ASCR
Aerodynamic wind tunnel testing of U-beams
The paper presents the outcomes from the experimental testing of the set of slender U-beams in the climatic wind tunnel. All analysed beams have identical basic geometry with the U-shaped cross ...
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