Dislocation Motion and Asymmetric Resonance Peaks

Asymmetries and jumps in amplitude of the resonance curves for lead are present in a region of strain amplitudes where the damping and modulus are rapidly varying with strain amplitude. This is due to the vibrations causing a change in the modulus of the specimen. This change takes place in a fraction of a second at room temperature and anneals out in a few seconds when the amplitude of vibration is reduced.

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