Simplified models of bolted joints under harmonic loading

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Simplified models of bolted joints under harmonic loadingIn an assembled structure a large proportion of the
damping may be provided by the joints. In his review，
Beards[1] estimated that up to 90% of the total system
damping might be provided by the joints of an assembled
structure. The influence of frictional joints can therefore
be very significant. However， the nonlinearity of frictional
contact at a pair of surfaces in contact makes analysis far
from straightforward. Furthermore， the contact condition
keeps varying with time under harmonic loading.
The study of friction in structural joints can be traced
back to at least D en Hartog
s paper on the response of a
mass-spring system with a combination of Coulomb fric-
tion and viscous damping [2]. Ferri [3] provided an intro-
duction to some of the analytical (notably the harmonic
balance method) and numerical methods used to represent
systems containing friction. Ferri
s paper， as well as the
review by Gaul and Nitsche [4]， highlighted a variety of
applications of harnessing the dissipative mechanism of
frictional joints.