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Metody hodnocení důlkového korozního napadení
Kreislová, K.; Nováková, R.; Majtás, Dušan
2014 - Czech
Článek popisuje metody měření hloubky důlkového korozního napadení. Použití digitální mikroskopie je porovnáno se standardním metalografickým hodnocením výbrusu. The article describes methods for measuring the depth of pitting corrosion attack. Comparison of digital microscopy and common metallography on sample crossection is made.
Keywords:
pitting corrosion evaluation; 3D microscopy; depth of pits; aluminium
Available in digital repository of the ASCR
Metody hodnocení důlkového korozního napadení
Článek popisuje metody měření hloubky důlkového korozního napadení. Použití digitální mikroskopie je porovnáno se standardním metalografickým hodnocením výbrusu....
Determination of drift distortion in SEM micrographs acquired at different magnifications and acquisition times
Petráňová, Veronika; Koudelka_ml., Petr; Valach, Jaroslav
2014 - English
In the experimental mechanics wide variety of optical methods including measurement of deformation at reduced length scales using combination of computer vision and scanning electron microscopy (SEM) have been recently applied. One of suitable methods for in-plane measurement of displacements and deformations in the micrographs obtained by SEM is the 2D digital image correlation. In contrast to images obtained in visible spectrum by classical optical devices temporally-varying distortions known as drift distortion are present in the SEM micrographs. These distortions are caused by positional errors of electron beam during scanning process. Magnitude of this effect decreases with higher conductivity of the sample and is also influenced by magnification and scanning time. For this purpose measurement of distortion was performed on a series of micrographs of conductive samples acquired at different magnifications and acquisition times. Surface of each sample was covered with liquid silver to ensure adequate contrast pattern necessary for determination of distortion’s magnitude and distortion magnitudes were assessed.
Keywords:
scanning electron microscopy; digital image correlation; drift distortion
Fulltext is available at external website.
Determination of drift distortion in SEM micrographs acquired at different magnifications and acquisition times
In the experimental mechanics wide variety of optical methods including measurement of deformation at reduced length scales using combination of computer vision and scanning electron microscopy ...
Experimental study of tile grout material behavior
Kumpová, Ivana; Kloiber, Michal; Ševčík, Radek; Kytýř, Daniel
2014 - English
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.
Keywords:
grout; three point bending test; microtomography; X-ray diffraction; FTIR
Fulltext is available at external website.
Experimental study of tile grout material behavior
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 ...
Aeroelastic divergence modeled by means of the stochastic resonance
Náprstek, Jiří; Pospíšil, Stanislav
2014 - English
The divergence is one of the most important and dangerous phenomenon of aeroelastic post-critical states occurring at a prismatic slender beam in a cross-flow. This phenomenon manifests by stable periodic hopping between two nearly constant limits perturbed by random noises. Experimental observation and numerical simulation motivates an idea to model this process as the effect of the stochastic resonance. Being observed and practically used in a number of disciplines in physics (optics, plasma physics, atd.) its mathematical basis follows in the most simple case from properties of the Duffing equation with negative linear part of the stiffness. The occurrence of this phenomenon depends on certain combinations of input parameters, which can be determined theoretically and verified experimentally in the wind tunnel.
Keywords:
stochastic resonance; interwell hopping; non-linear vibration; aeroelastic divergence
Available in digital repository of the ASCR
Aeroelastic divergence modeled by means of the stochastic resonance
The divergence is one of the most important and dangerous phenomenon of aeroelastic post-critical states occurring at a prismatic slender beam in a cross-flow. This phenomenon manifests by stable ...
Influence of geometric parameters on the stiffness of traditional dovetail timber joint
Kunecký, Jiří; Cacciotti, Riccardo; Kloiber, Michal
2012 - English
The paper presents the development of numerical modeling for a traditional dovetail timber joint. The objective is to find the influence of its geometrical properties on the mechanical stiffness of the joint as well as to assess the main problems and limitations faced during the numerical modeling of the structure. An experiment with a replicated timber joint was used to validate the model. Material properties were ascertained and contact adjustment was made. Parametric study was performed: two angles of the joint beams were varied. Suitable ranges of the angles for each type of loading were found. Main limitations and problems present in the modeling are depicted in the discussion.
Keywords:
timber joint; numerical modeling; dovetail
Available in digital repository of the ASCR
Influence of geometric parameters on the stiffness of traditional dovetail timber joint
The paper presents the development of numerical modeling for a traditional dovetail timber joint. The objective is to find the influence of its geometrical properties on the mechanical stiffness of ...
Odlišnosti historických a moderních vápenných pojiv použitých pro přípravu malt a omítek
Válek, Jan
2011 - Czech
Příspěvek ukazuje poznatky z oblasti charakterizování historických malt a poukazuje na potencionální odlišnosti tradiční výroby vápenného pojiva a přípravy malt oproti současné výrobě. Cílem příspěvku je revidovat současné poznatky a vytyčit směry výzkumu v oblasti výroby vápenného pojiva jako tradičního materiálu pro obnovu památek. The paper presents foundings from the field of characterisation of historic mortars and points at potential differences between traditional production of lime binder and preparation of mortars and “modern” ones. The aim of the contribution is to revise the current state of the art and mark out main research directions.
Keywords:
lime; traditional lime production; characterisation of historic mortars
Available in a digital repository NRGL
Odlišnosti historických a moderních vápenných pojiv použitých pro přípravu malt a omítek
Příspěvek ukazuje poznatky z oblasti charakterizování historických malt a poukazuje na potencionální odlišnosti tradiční výroby vápenného pojiva a přípravy malt oproti současné výrobě. Cílem příspěvku ...
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