ANOMALOUS AMPLITUDE DEPENDENT DISLOCATION DAMPING ASSOCIATED WITH ANHARMONIC OSCILLATIONS OF A COULOMBIC KINK CHAIN IN THE NONLINEAR DISSIPATIVE ATMOSPHERE OF IMPURITY ATOMS

OGURTANI T.

PHYSICA STATUS SOLIDI A-APPLIED RESEARCH, vol.128, no.1, pp.69-81, 1991 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 128 Issue: 1
  • Publication Date: 1991
  • Doi Number: 10.1002/pssa.2211280108
  • Journal Name: PHYSICA STATUS SOLIDI A-APPLIED RESEARCH
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Compendex, INSPEC
  • Page Numbers: pp.69-81
  • Middle East Technical University Affiliated: No

Abstract

The effects of the anharmonic interaction of the Coulombic kink chain on the strength and the position of the cold-work internal friction peaks associated with the nonlinearly power dissipating impurity atoms are investigated by a novel numerical simulation of the related discrete mathematical macro-model. The present macroscopic model of dislocation damping which relies heavily on the microscopic theory of kink-interstitial interactions shows very strong anomalous strain amplitude as well as the bias stress dependence of internal friction peaks in accord with the experimental observations. Also it is deduced that the strength of pinning of the kinks at the ends of the chain can have profound influence on the strength and the position of the dislocation damping peaks.