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National Repository of Grey Literature 3 records found  Search took 0.03 seconds. 
Vliv plasticky indukovaného zavírání trhliny a bi-materiálového rozhraní na prahové hodnoty
 Náhlík, Luboš ; Hutař, Pavel
The paper is devoted to fatigue crack propagation in layered materials. The influence of plasticity induced crack closure on threshold values for fatigue crack propagation through interfaces between different materials layers is studied. The main aim was to estimate the influence of the loading ratio R on threshold values for crack propagation through a bi-material interface as a function of the elastic mismatch of both materials. The finite element method (FEM) is used for numerical calculations. Results obtained for different loading ratios, materials, boundary conditions and magnitude of applied loading can be generalized and used for the design of composite bodies with different material layers.
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Numerické řešení nárůstu glazového ledu
 Hoření, Bohumír ; Horák, V.
The paper presents the main problem of the wing airfoil glaze ice accretion prediction: theoretical solution of the flow of a thin layer on a cold surface and gradual freezing. There are formally arranged the conservative equations using for the solution of water flow in open channels. The flux terms are evaluated using a discontinuous Galerkin method, which could be considered as a generalized finite volumes classical method.
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Rekonstrukce kraniocerebrálního poranění pomocí metody konečných prvků
 Jiroušek, Ondřej ; Brichtová, E. ; Jírová, Jitka
The paper deals with reconstruction of a sport accident using detailed FE model of skull and brain is presented in the paper. The sport accident involved a 12-year old boy on whom a handball cage fell during school sport activity. FE model of human head was developed using series of CT scans obtained postsurgically. Rigid body model was used to assess initial conditions at the moment of the impact which were used in finite element modeling of the head impact. The detailed FE model was imposed to the initial conditions obtained just before the head impacted the playground. The pressure, shear stress response, von-Mises stress response and logarithmic strain values were evaluated in four regions: (i) frontal, (ii) parietal, (iii) occipital and (iv) midbrain region. For the head injury assessment a criterion based on the criterion proposed by Miller et al. in 1998 is applied. Results from the numerical analysis of the accident showed good agreement with clinically observed head injuries.
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