Internal Friction in the Presence of a Static Stress

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Abstract
The internal friction of pure lead, copper, and aluminum single crystals was measured as a function of an externally applied static biasing stress. The low strain amplitude damping of copper and lead was found to be essentially unaffected by the presence of the static stress. Aluminum differs from lead and copper in that at room temperature, damping is independent of amplitude at low strain amplitudes (ε−6). The damping in aluminum becomes strain‐amplitude dependent only at higher strain amplitudes. The presence of the static stress causes this amplitude dependence to shift to lower stress amplitudes by an amount comparable to the static stress applied.

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