Home > Search Results: 999C1a:TH01010772
Search:
Search Tips :: Advanced Search
Search collections:
Sort by: Display results: Output format:
National Repository of Grey Literature 9 records found  Search took 0.02 seconds. 
Experimental and finite element analysis of composite gun barrels
 Mochar, Dominik ; Trnka, Jan ; Chlada, Milan ; Valeš, František ; Gabriel, Dušan ; Červ, Jan ; Vtípil, J.
In this work experimental and numerical investigation of composite gun barrels was studied. The history of the stress-induced deformations located at the center of gun barrels on the outer surface generated by impact loading was measured for six types of barrels. The obtained signals were subsequently evaluated using wavelet transformation. Finally, the finite element analysis in Abaqus and MARC software for optimum composite material M46J was performed.
Detailed record
The methodology for modeling of dynamic processes using finite element method – phase II
 Mochar, Dominik ; Mračko, Michal ; Gabriel, Dušan ; Kolman, Radek ; Kopačka, Ján
In this work, the dispersion properties of bilinear four-noded elements with reduced integration on the impact of two elastic cylinders for which an analytical solution is available were tested. Attention was paid to examining the effect of the element size and the time integration step on the accuracy of the numerical solution.
Detailed record
Experimental and finite element analysis of composite gun barrels
 Mochar, Dominik ; Gabriel, Dušan ; Trnka, Jan ; Chlada, Milan ; Valeš, František ; Masák, Jan
In this work experimental and numerical investigation of composite gun barrels was studied. The history of the stress-induced deformations located at the center of gun barrels on the outer surface generated by impact loading was measured for six types of barrels. The obtained signals were subsequently evaluated using wavelet transformation. Finally, the finite element analysis in Abaqus and MARC software for optimum composite material M46J was performed.\n\n
Detailed record
Explicit dynamic finite element analysis of a firing pin assembly
 Mochar, Dominik ; Gabriel, Dušan ; Masák, Jan ; Kopačka, Ján ; Kolman, Radek ; Plešek, Jiří ; Hynek, P. ; Vtípil, J.
In this paper, explicit dynamic finite element analysis of a firing pin assembly was performed. Two different geometries of the firing pin were considered using the finite element software PMD and Abaqus. For both variants there was evaluated a stress distribution at the critical point of a tested component, that is going to be later used for a fatigue analysis of the firing pin.
Detailed record
A short wave limit of the frequency equation for plane-stress nonaxisymmetric disc motions
 Červ, Jan ; Valeš, František ; Adámek, V.
It is proved that the general frequency equation for plane-stress nonaxisymmetric disc motions tends for the first mode of propagation and for wavelengths very short when compared with the disc radius to the secular equation for Rayleigh waves.
Detailed record
Explicit dynamic FE analysis of a firing pin assembly
 Mochar, Dominik ; Masák, Jan ; Gabriel, Dušan ; Kolman, Radek ; Kopačka, Ján ; Plešek, Jiří
In the report the results of explicit dynamic finite element analysis of a firing pin assembly are summarized. First, the verification calculation with no contact conditions is described. Next, the results of explicit contact-impact dynamic analysis are presented.
Detailed record
Methodology for modeling of dynamic processes by finite element method - Phase I
 Kolman, Radek ; Gabriel, Dušan ; Červ, Jan ; Plešek, Jiří
In the report, the using of explicit finite element analysis for solving wave propagation problems in solids is presented in depth. Its grid and full dispersion analysis is given with the influence of mesh size and time step size. Conclusion of the report summarizes criteria for mesh size and time step size settings so that dispersion errors do not exceed permissible values.
Detailed record
Dispersion properties of finite element method: review
 Kolman, Radek ; Okrouhlík, Miloslav ; Plešek, Jiří ; Gabriel, Dušan
Review of the dispersion properties of plane square bilinear finite element used in plane elastic wave propagation problems is presented. It is assumed the grid (spatial) dispersion analysis and, further, the temporal-spatial dispersion analysis for explicit direct time integration based on the central difference method. In this contribution, the dispersion surfaces, polar diagrams and error dispersion graphs for bilinear finite element are depicted for different Courant numbers in explicit time integration. Finally, recommendation for setting the mesh size and the time step size for the explicit time integration of discretized equations of motion by the bilinear finite element method is provided.
Detailed record
Numerical solution of a secular equation for rayleigh waves in a thin semi-infinite medium made of a composite material
 Červ, Jan ; Adámek, V. ; Valeš, František ; Parma, Slavomír
The traditional way of deriving the secular equation for Rayleigh waves propagating along the stress-free edge of a thin semi-infinite composite is presented. It means that it is necessary to find a general steady-state solution that vanishes at infinity. The secular equation is then obtained by vanishing of the surface traction at the stress-free edge. For the solution of such secular equation it is necessary to precompute some roots of characteristic quartic equation. The method shown in this paper, based on displacement formulation, leads to the so-called implicit secular equation. The numerical approach to the solution is shown.
Detailed record

Interested in being notified about new results for this query?
Subscribe to the RSS feed.
Digital Repository :: Search :: Submit :: Personalize :: Help
Powered by Invenio v1.1.2
Maintained by admin.invenio@techlib.cz
This site is also available in the following languages:
Česky  English