9 research outputs found
Experimental moose test
The work has been supported by the internal grant project SGS-2022-008 Mathematical
modelling and numerical simulations of material structures and mechanical and biomechanical
systems
Electric field-assisted ion exchange strengthening of borosilicate and soda lime silicate glass
In this study, we investigate the effects of electric field-assisted ion exchange (EF-IE) on potassium for sodium ion exchanges of soda borosilicate and soda lime silicate glasses. The results show that applying an electric field (E-field) with the intensity of 1000 V cm-1 for few minutes produces an exchanged layer with a thickness comparable to the conventional chemical strengthening for 4 hours. There is a critical E-field that increases the mobility and, therefore, the diffusion coefficient of the potassium ions in the glasses. The increase is, perhaps, related to the evolution of the glass structure due to the penetration of potassium ions under an E-field. Vickers indentations showed that strong compression is generated in the glass by EF-IE; however, the bending strength improvement is limited because of the presence of large surface defects and the stress distribution inhomogeneit
Virthuman application for family safety in highly automated vehicle’s frontal crash
the European Regional Development Fund-Project “Application
of Modern Technologies in Medicine and Industry” No. CZ.02.1.01/0.0/0.0/17_048/000728
Experimental moose test
The work has been supported by the internal grant project SGS-2022-008 Mathematical
modelling and numerical simulations of material structures and mechanical and biomechanical
systems
\uc5kermanite glass microspheres: Preparation and perspectives of sinter-crystallization
Glass microspheres with the exact stoichiometry of \ue5kermanite (Ca2MgSi2O7), one of the most promising modern bioceramics, were produced by the flame synthesis method. The distinctive high cooling rate was found to prevent the crystallization; the size of amorphous microbeads could be correlated with the size of partially crystallized precursor powders, deriving from conventional melt quenching and milling. The glass microspheres were characterized in terms of crystallization and sintering behavior, in the perspective of applications in additive manufacturing of \ue5kermanite-based scaffolds. The results showed that merwinite (Ca3MgSi2O8) is the primary product of glass devitrification; only in a second stage, merwinite reacts with the residual glass and yields \ue5kermanite. The rapid crystallization, implying limited viscous flow sintering, was tested as an opportunity to create components with complex porosity distribution
Vibration behavior of thin-walled steel members subjected to uniform bending
This article reports the results of an investigation on the effects of internal moments
on the vibration behavior of thin-walled steel members. The analyses are based
on the Generalized Beam Theory (GBT), a thin-walled bar theory accounting for crosssection
in-plane deformations ? its main distinctive feature is the representation of the
member deformed configuration by means of a linear combination of cross-section
deformation modes, multiplied by their longitudinal amplitude functions. The study
concerns a simply supported T-section (with unequal flanges) members exhibiting a
wide range of lengths and subjected to uniform internal moment diagrams ? their magnitudes
are specified as percentages of the corresponding critical buckling values. After
providing a brief overview of the main concepts and procedures involved in performing
a GBT-based structural analysis, the vibration behavior of load-free and loaded T-section
members is addressed ? the influence of the applied loadings is assessed in terms of
(i) the fundamental frequency difference and (ii) the change in the corresponding vibration
mode shape. For validation purposes, some GBT results are compared with values
yielded by shell finite element analysis performed in the code ABAQUS (Simulia, 2008)