Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. IV France 06 (1996) C8-265-C8-268
Amplitude-Dependent Internal Friction in Lead at Ambient TemperatureS. Kustov1, S. Golyandin1, K. Sapozhnikov1 and W.H. Robinson2
1 A.F. Ioffe Physico-Technical Institute, Politekhnicheskaja 26, 194021 St. Petersburg, Russia
2 Penguin Engineering Ltd (Pel), P.O. Box 33-093, Petone, New Zealand
Amplitude-dependent internal friction of polycrystalline commercial lead has been studied in wide frequency and strain amplitude ranges. The strain amplitude dependence shows two stages characterized by different recovery times. These stages are attributed to different mechanisms : dislocation - point obstacle interaction at moderate amplitudes and interaction between dislocations along with their multiplication at the high ones. Pronounced and nonmonotonous dependence of the amplitude-dependent internal friction and elastic limit on prestrain is revealed. This peculiarity is attributed to transition from relatively homogeneous dislocation distribution to the inhomogeneous one due to formation of the cellular structure.
© EDP Sciences 1996