The inelastic deformation behavior of PMR-15 neat resin, a
high-temperature thermoset polymer, was investigated at 288 degrees
C. The experimental program was designed to explore the influence
of strain rate on tensile loading, unloading, and strain recovery
behaviors. In addition, the effect of the prior strain rate on the
relaxation response of the material, as well as on the creep
behavior following strain controlled loading were examined. The
experimental data were modeled with the Viscoplasticity Based on
Overstress (VBO) theory. A systematic procedure for determining
model parameters was developed and the model was employed to
predict the response of the material under various test histories.
Additionally the effects of prior aging at 288 degrees C in argon
on the time (rate)-dependent behavior of the PMR-15 polymer were
evaluated in a series of strain and load controlled experiments.
Based on experimental results, the VBO theory was extended to
capture the environmentally induced changes in the material
response. Several of the VBO material parameters were expanded as
functions of prior aging time. The resulting model was used to
predict the high-temperature behavior of the PMR-15 polymer
subjected to prior aging of various durations.
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