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Strong non-linear oscillators modelling
Kocanda, Lubomír
Several basic features of soft impact oscillators were invented and proved by means of experiment, numerical simulation and theoretical solution. The strong and soft impact phenomena and stable grazing bifurcation crossing were explained by means of the analytical solution, as well. New methods of piecewise linear system stability investigation were designed and compare with conventional methods. Some basic piecewise linear system features were found.
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Ab initio calculations of theoretical strength and phase stability in copper
Černý, M. ; Šob, Mojmír ; Šandera, P.
Simulation of tensile test of copper cryslat along <001> is performed using ab initio full-potential linear augmented plane waves (FLAPW) method. Both the local density approximation (LDA) and generalized gradient approximation (GGA) are used to evaluate exchange-correlation contribution to the total energy. Equilibrium lattice parameter and Young modulus are computed ro assess reliability of our results by comparing them with experiment. Stability conditions for uniaxially loaded system are presented and analyzed. Finally, the ideal strength (IS) is calculated.
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