Abstract
The strain-amplitude and frequency-dependent internal friction due to movements of dislocations in the presence of uniform point defect dragging and randomly distributed, weak pinning obstacles is investigated using the string model. By making use of computer simulations with the catastrophic breakaway distribution function and uniform point defect dragging, the internal friction coefficient is obtained as a function of the stress amplitude, homologous temperature, driving frequency, and densities of the dragging point defects and the weak pinning obstacles.
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