Abstract
This research investigated the effects of stress and material type on the long-term creep behavior of glass-reinforced thermoplastics. The polymers investigated were PEN, PET, PBT, PP, Nylon-6 and Nylon-66. Each polymer was compounded with 30% glass fiber reinforcement. Viscoelastic design properties were derived from the experimentally measured creep data. Design properties include isochronous stress–strain diagrams, creep modulus charts, and the material constants of the Maxwell linear viscoelastic constitutive equation. Relationships between the design properties and polymer structure are discussed.
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