Hardened polyester and epoxy resins were tested for the relaxation of mechanical
stresses, depending on the initial stress (2.6 Ÿ 24 MPa), time and temperature (15 Ÿ 45 œC).
The dependence of stress on time in the relaxation of resins in the investigated ranges of
mechanical stresses is described by the logarithmic function characteristic for stress relaxation
in crystalline solids (metals).
Keywords: epoxy resin; polyester resin; relaxation; mechanical stress.
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