Browsing by Author "Bradáč Josef"
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- ItemDG solver for the simulation of simplified elastic wawes in two dimensional piecewise homogenous media(2017) Hozman Jiří; Bradáč Josef; Kovanda JanThe theory of elasticity is a very important discipline which has a lot of applications in science and engineering. In this paper we are interested in elastic materials with different properties between interfaces implicated the discontinuous coefficients in the governing elasticity equations. The main aim is to develop a practical numerical scheme for modeling the behaviour of a simplified piecewise homogeneous medium subjected to an external action in 2D domains. Therefore, the discontinuous Galerkin method is used for the simulation of elastic waves in such elastic materials. The special attention is also paid to treatment of boundary and interface conditions. For the treatment of the time dependency the implicit Euler method is employed. Moreover, the limiting procedure is incorporated in the resulting numerical scheme in order to overcome nonphysical spurious overshoots and undershoots in the vicinity of discontinuities in discrete solutions. Finally, we present computational results for two-component material, representing a planar elastic body subjected to a mechanical hit or mechanical loading.
- ItemEffect of age hardening conditions on mechanical properties of AW 6082 alloy Welds(Univerzita J. E. Purkyne, 2016) Moravec Jaromír; Nováková Iva; Bradáč Josef
- ItemThe impact of selected processes and technological parameters on the geometry of the weld pool when welding in shield gas atmosphere(Czech Technical University, 2017) Bradáč Josef; Moravec JaromírThis paper is focused on welding with a consumable electrode in a gas shield atmosphere and its main aim is to show the influence of selected processes and technological parameters on the geometry of the weld pool in terms of theoretical and experimental views. For this purpose, the parametric areas defined by the change of the welding current and welding rate were determined. Apart from the influence of these parametric areas, the influence of other technological input variables, including the wire diameter and preheating temperature, was also studied. The experimentally obtained geometric data of the weld pool can be used for technological welding procedures WPS and especially for simulation calculations to obtain a more accurate numerical model of the heat source. This makes it possible to get accurate simulation results and to better understand the impact of other variables that influence the welding process. This all helps to the optimization of the welding process for several applications
- ItemMachines for Processing Metals and Plastics(Technická Univerzita v Liberci, 2016) Bradáč Josef; Machuta Jiří; Nová Iva; Seidl Martin; Sobotka Jiří; Solfronk Pavel
- ItemNew methods of obtaining input data of numerical computations by using heat treatment simulator(Trans tech Publications Ltd, 2014) Moravec Jaromír; Dobránsky Jozef; Bradáč Josef; Nováková Iva
- ItemNUMERICAL STUDY OF THE TEMPERATURE FIELD FOR Fe3Al LASER WELDING(Institute of Metals and Technology, 2021) Bradáč Josef; Hozman Jiří; Lamač Jan
- ItemThe Impact of Thermal Cycles of Superheated Steam on Pipes Material of By-Pass of Steam and Gas-Steam Turbines(Tanger Ltd., 2015) Moravec Jaromír; Bradáč Josef; Beran David; Nováková Iva
- ItemWays of Numerical Prediction of Austenitic Grain Size in Heat-Affected Zone of Welds(Trans Tech Publications Ltd, 2014) Moravec Jaromír; Bradáč Josef; Nováková Iva