Author(s)

M. Klasztorny

Abstract

Constitutive compliance 1 stiffness equations of viscoelasticity for resins M. Klasztorny Institute of Mechanics & Design, Warsaw University of Technology, Warsaw, PoIand Abstract A rheological model HWKIUH for reslns has been developed, taking into consideration up-to-date results of analys~s of the expermental data. This model maltes possible simulation short-, medium- and long-term viscoelastic processes in epoxy or polyester resin, provided that these processes are reversible and of the first-rank type. Constltutlve compliance equations of viscoelasticity have been formulated in the shear-bulk version. The shear (distorsional) strains are simulated with three linearly independent stress-history functions. The bulk (voluininal) strains are simulated as ideally elastic. An analytic method for reversal of constitutive compliance equations of viscoelasticity has been developed. This method uses approximate constitutive stiffness equations of v~scoelasticity, that simulate time histories of the

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