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Národní úložiště šedé literatury Nalezeno 3 záznamů.  Hledání trvalo 0.01 vteřin. 
Identification of complex modulus using of the Hopkinson Split Pressure Bar.
 Buchar, J. ; Trnka, Jan ; Řídký, R.
A split Hopkinson pressure bar procedure was used for non-parametric identificon of complex\nmodulus under conditions of non-equilibrium and axially non-uniform stress Tests were carried out with\naluminium bars and with specimens of composite materials (Low viscosity epoxy resin and Baytube multiwalled\ncarbon nanotubes) and having diameter 15 mm and length 7 mm. The influence of the nanotubes\nconcentration on the dynamic response of given composites was evaluated.
Úplný záznam
A Split Hopkinson Bar Method for Testing Materials with Low Characteristic Impedance
 Buchar, J. ; Řídký, R. ; Drdlová, M. ; Trnka, Jan
A split Hopkinson pressure bar (SHPB) technique has been developed to study dynamic behaviour of materials having low characteristic impedance. To enable better matching of characteristic impedance with a specimen, polymethyl methacrylate (PMMA) bar is used as the output bar. The viscoelastic properties of PMMA are determined in advance through preliminary experiments. In the present SHPB method, the wave analysis of the stress pulses is executed in the frequency domain. Transmitted pulses on the PMMA output bar resulting from a SHPB test are resolved into frequency components by the Fourier transform, and are corrected to be the waveforms at the specimen-bar interfaces. The corrected waveforms have been used for the evaluation of experimental results on the stress pulse transmission and reflection at the interface between elastic (Aluminium) and viscoelastic bars.
Úplný záznam
Evaluation of Plate Structure Response to Buried Explosive Charges
 Buchar, J. ; Řídký, R. ; Drdlová, M. ; Trnka, Jan
An interactiom of the blast pressure wave after detonation of a burried mine under the multilayer mine protection mounted to the bottom of a vehicle is described in this paper.The main focus was applied to absorbing capability of the multilayer sandwich. Results from numerical simulations were compared with experimental tests. The test procedure is provided according to STANAG 4569/AEP-55 standard with threat level 3B.
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