Seal Design > Three
and Seal Design Theory
is incompressible if it exhibits zero volumetric change (isochoric)
under hydrostatic pressure. Theoretically, Poisson's ratio is exactly
one-half (0.5) and the bulk modulus is infinite (and det f = 1).
means that Poisson's ratio is slightly less than 0.5.
a rate-dependent behavior that can be modeled as a viscoelastic material
whose properties change with temperature and time. Features of viscoelastic
constant stress leads to creep
constant strain leads to stress relaxation
loading/unloading leads to hysteresis
friction-rearrangement of molecular structure under load.
crystallization-formation and melting of crystallized regions.
softening (Mullin's effect).
breakdown-the breakdown of reinforcing filler/ polymer bonds.
deformation-dispersed inclusions contribute to hysteresis.
change causes thermal strains.
properties change. Heat flow may occur.
Finite Element Analysis (FEA)
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