Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

DY: Fachverband Dynamik und Statistische Physik

DY 31: Statistical Physics far from Equilibrium

DY 31.8: Vortrag

Freitag, 26. März 2010, 12:15–12:30, H38

Dynamic crack propagation of icosahedral quasicrystals — •Tian You Fan — Department of Physics, Beijing Institute of Technology

Based on the Landau-Anderson symmetry-breaking princple on condensed matter, theory of elasticity of quasicrystals is developed, in which the two elementary excitations--phonon and phason play a central role. Elasticity and other mechanical behaviour of quasicrystals are connected close to the defects, among them dislocations and cracks are observed. The study of dynamic crack propagation is interesting in particular. The present work uses the elato-/hydro-dynamic model of quasicrystals and discusses the response of crack to the impact force and the crack fast propagation of icosahedral Al-Pd-Mn quasicrystals, the comparison of the results to those of decagonal Al-Ni-Co quasicrystals is given. The results show the effects of phason and phason-phonon coupling to the resonse and propagation, the effects are more important than that in static cases.