Slow dynamics in non linear elastic sintered porous titanium and alumina

Abstract

Slow dynamics phenomenon in the partially sintered porous alumina and titanium that demonstrate the nonlinear elastic behavior under mechanical resonance condition was studied. It was found that the resonant frequency and the damping factor were changed during the oscillations with relatively high amplitude, and they were recovered after termination of the oscillation within ~10⁴ s. The slow dynamic was found to be connected with other non linear effects. The transition of planar defects to activated state under the cyclic loading and gradual relaxation the structure to stability after unloading is the probable case the studied effects. Full text download