Vg. Oancea et Ta. Laursen, INVESTIGATIONS OF LOW-FREQUENCY STICK-SLIP MOTION - EXPERIMENTS AND NUMERICAL MODELING, Journal of sound and vibration, 213(4), 1998, pp. 577-600
Dry frictional contact between two steel surfaces in a harmonically fo
rced spring-mass system is investigated both experimentally and numeri
cally. The experimental set-up is somewhat novel in that the spring-ma
ss system is excited through the frictional interface, facilitating de
tailed study of interactions between the system's dynamic characterist
ics and the stick-slip motion observed at the interface. A characteriz
ation of the effect of wear upon observed stick-slip is given, resulti
ng in the identification of three sliding regimes displaying varying d
egrees of wear. Subsequent attention is focused primarily on the first
of these regimes, the low wear regime, which features low frequency s
tick-slip oscillations that can be measured quite reliably. This work
particularly emphasizes the nature of transients entering and exiting
stick phases, with several representations given of the evolution of t
hese transients as control parameters are changed. Multiperiod and cha
otic motions of the mass are also observed, with routes to chaos being
qualitatively similar for a wide range of system parameters. The work
also presents some numerical results in support of the experimental w
ork, utilizing a rate- and state-dependent friction model proposed pre
viously by the authors. It is seen that this model yields significantl
y better predictions than can a simple Coulomb representation. (C) 199
8 Academic Press Limited.