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Buckling of shells by FEM
Krásný, I. ; Leština, J. ; Plešek, Jiří
Methods presented in the paper: non-linear analyses, the results are real stability limits: classical anal., the results are ideal stability limits which must be reduced by coefficients reflecting the differences between the ideal and real stability l
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Numerical calculation of natural frequencies of an elastic sphere containing a compressible fluid
Zolotarev, Igor
The numerical calculation of natural frequencies of a spherical shell with an acoustical medium is studied in this paper as an approximation of the human skull. The elastic sphere is described by using thin shell theory and, in general, a compressible inviscid fluid, that is considered in the inside of the vibrating shell. The dynamic characteristics such as the natural frequencies and the modes of vibration are analysed as functions of the geometrical and physical parameters of the studied system. The problem of numerical calculations of the multiple natural frequencies of an elastic sphere and the coupling effect of the sphere and compressible fluid are discussed.
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Modelling of Local Bulging of a Pipe
Micka, Michal ; Jíra, J.
Local defects affect the stress state in the pipe wall. The stress and strain state in the neighbourhood of the local bulging of the pipe wall can be modelled numerically using the FEM. The model is made from the segment cut-out from the pipe wall with a definite defect in the form of the bulge (owing to the symmetry a quarter of the defect with his neighbourhood can be considered).
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Contact pressure between head and helmet loaded by external forces
Micka, Michal ; Jírová, Jitka
The simple test of the bike helmet loaded by statical forces on the top of the head is simulated using program ANSYS. The standardized model for laboratory tests of helmets is used as the model of the head. The goal of the project is to obtain details about contact forces or stresses between the cranium and the helmets, which will be used for future development of safety helmets or by modelling of a hurt of the head at accident.
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