Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Zdeněk Majer"'
Publikováno v:
Key Engineering Materials. 827:222-227
The contribution deals with modelling and prediction of failure of mechanically loaded open cell ceramic foam structures by using 3D volume FE models constructed from CT scans of real foam specimens. The condition for crack initiation in particular s
Publikováno v:
Key Engineering Materials. 827:324-329
The paper deals with an analysis of maximal operation amplitudes of piezoelectric energy harvesting systems generating electrical energy from ambient vibrations. Energy harvesting systems could be very interesting alternative for autonomous powering
Autor:
Pavel Tofel, Oldřich Ševeček, Daniel Drdlik, Zdeněk Majer, Zdenek Machu, Vladimir Holcman, Hynek Hadraba, Zdenek Hadas, Zdeněk Chlup
Publikováno v:
The European Physical Journal Special Topics. 228:1575-1588
The paper is focused on a very hot topic of SMART materials and their architectures for energy conversion systems designed for conversion of mechanical to electrical energy using the piezoelectric effect. The aim of the study is to increase both the
Autor:
Lukáš Řehořek, Zdeněk Chlup, Luca Bertolla, Petr Marcián, Oldřich Ševeček, Michal Kotoul, Zdeněk Majer
Publikováno v:
Theoretical and Applied Fracture Mechanics. 100:242-250
In this contribution, open cell ceramic foam structures composed of regular/irregular shape cells and containing a macroscopic central notch/crack were investigated in terms of their cracking upon the tensile loading and their strength was predicted
Publikováno v:
Procedia Structural Integrity. 23:535-540
In this work, a special multilayer piezoelectric cantilever energy harvester with active piezo-electric and protective ceramic layers was suggested and studied. Fracture mechanics behavior of such a layered structure was analyzed by means of the anal
Publikováno v:
Procedia Structural Integrity. 2020, vol. 23, issue 1, p. 553-558.
Nowadays used open cell foam ceramic materials are mostly of irregular structure which means that the shape of particular foam cells does not exhibit any regular pattern. On one hand, such foam structures lead to only very slight anisotropic or even
Publikováno v:
Key Engineering Materials. 774:271-276
This work deals with a computational analysis and quantification of the influence of processing (primarily crack-like) defects of various amount on the (tensile) strength of open cell ceramic foam structures. This information is essential e.g. for ap
Publikováno v:
Key Engineering Materials. 774:416-422
This paper is focused on an analysis of a multilayer ceramic-based piezoelectric vibration energy harvester, which could be excited by ambient vibrations or external forces and thus provide a useful source of electricity for modern electronics. The p
Publikováno v:
Key Engineering Materials. 754:103-106
A crack propagation and fracture behaviour of particulate ceramic composite were investigated. Influence of 3D shape of particles on the crack propagation was studied together with influence of the presence of residual stresses, which are developed i
Publikováno v:
Key Engineering Materials. 754:107-110
A micro-crack propagation in particulate ceramic based composite was studied using finite element method (FEM). Subcritical crack growth (SCG) was numerically simulated under complex load conditions (mechanical loading and loading by internal residua