Characterizing and Modeling Physical Aging in Polymeric Composites
Final rept. 1 Dec 1997-31 Mar 2001
PURDUE UNIV LAFAYETTE IN
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Physical aging in polymeric composites was experimentally investigated and analytically modeled. Attention was focused on physical aging behavior on elastic and creep compliances. Short term creep tests were conducted under isothermal conditions on off-axis composite specimens for different temperatures as well as moisture contents. A master creep curve was employed to describe the anisotropic creep behavior in the composite with the aid of a one-parameter creep potential function. Shift factors and shift rates were used to collapse the creep curves of different aging times to a chosen reference creep curve. An effective time was introduced to predict the long term creep compliance based on the creep model established based on the short term creep data. Moisture has a similar effect on the rate of physical aging. In the present study, a temperature-moisture equivalence was established for the effects of these two variables. With this equivalence, the effect of moisture on physical aging can be predicted using the model with temperature.
- Laminates and Composite Materials