THE POWER SPECTRUM ASSOCIATED WITH A KINK CHAIN OSCILLATING IN A NON-STOKESIAN ATMOSPHERE OF PARAELASTIC INTERSTITIALS


OGURTANI T., GUNGOR R.

JOURNAL OF ALLOYS AND COMPOUNDS, vol.211, pp.140-143, 1994 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 211
  • Publication Date: 1994
  • Doi Number: 10.1016/0925-8388(94)90467-7
  • Title of Journal : JOURNAL OF ALLOYS AND COMPOUNDS
  • Page Numbers: pp.140-143

Abstract

The power spectrum of a built-in kink chain oscillating in an atmosphere of paraelastic interstitials was investigated numerically using a fast Fourier transform technique. Above a sharply defined value of the strain amplitude, odd-harmonic generation is observed only at the low-temperature side of the dislocation relaxation peak associated with interstitial-kink interaction. At moderately high strain amplitudes, a strong enhancement of the harmonics situated in the immediate vicinity of the natural resonance frequency of the chain and complete depression of the rest are clearly seen. Finally, the onset of quasi-chaotic kink oscillations is detected when the system is driven into the super-Snoek regime where atmospheric tearing takes place.