An experimental study was undertaken to compare the effects of physical aging on the viscoelastic behavior of IM7/K3B 12 composite and the K3B neat resin loaded in tension and compression. The tests, run over a range of sub-glass transition temperatures, provided material constants, material master curves and aging related parameters. Comparing results from the short term K3B resin and the IM7/K3B 12 composite behavior indicated that trends in the data with respect to aging time and aging temperature for tension loading are similar; however, trends in the IM7/K3B 12 composite curves in compression appear more exponential than in the K3B resin curves, and show a more uniform creep rate as a function of temperature. Although most of the long term predictions made in this study physically aged with time as expected, the rate of aging in tension was more severely altered with increasing temperature than in compression.
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