Abstract
The dynamic viscoelastic shell displacement equation used to represent the mechanical behavior of cylindrical lip seals of constant thickness is solved with boundary conditions consisting of a load applied instantaneously at the free end of the lip seals, while the other end is clamped to a metal insert. The solution is achieved by superposition of the quasislatic viscoelastic solution with the elastic eigen-value solution for the free-fixed seal. The viscoelastic properties of seal compounds are represented by a three-element Maxwell model. The dynamic creep curves show a ringing superposed on the creep, with amplitude and decay of ringing depending on the type of rubber used. The identical seal made of a Hookean material exhibits no creep and non-decaying ringing. The impact or instantaneous initial displacement of the quasistatic solution is replaced by a wave propagating along the seal, which is initially at rest.
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