Inertial Oscillations of Pinned Dislocations

Details Inertial Oscillations of Pinned Dislocations Inertial Oscillations of Pinned Dislocations

2010-02-02

arxiv.org/abs/1002.0422v1

Physical Review B 82, 184113 (2010)

Physics

Condensed Matter

Materials Science

28 pages, 4 figures

Scientific paper

10.1103/PhysRevB.82.184113

Dislocation pinning plays a vital role in the plastic behaviour of a crystalline solid. Here we report the first observation of the damped oscillations of a mobile dislocation after it gets pinned at an obstacle in the presence of a constant static shear load. These oscillations are found to be inertial, instead of forced as obtained in the studies of internal friction of solid. The rate of damping enables us to determine the effective mass of the dislocation. Nevertheless, the observed relation between the oscillation frequency and the link length is found to be anomalous, when compared with the theoretical results in the framework of Koehler's vibrating string model. We assign this anomaly to the improper boundary conditions employed in the treatment. Finally, we propose that the inertial oscillations may offer a plausible explanation of the electromagnetic emissions during material deformation and seismic activities.

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