Failure Analysis for Polycarbonate Transparencies,
Final rept. 1 Dec 93-1 Sep 95,
BATTELLE MEMORIAL INST COLUMBUS OH
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An attempt was made to develop diagnostic, preventive, and predictive methods for the analysis of Polycarbonate fracture based on the model of critical free volume leading to a brittle ductile transition. Since it has been shown that polycarbonate can be rejuvenated by heating above its glass transition temperature to regenerate the necessary excess free volume, brittle failures can be averted in transparencies that are close to the ductile-brittle transition. A master curve of free volume versus aging time, normalized for stress level and temperature was to be developed. However, due to opposing forces developed under temperature and stress the net results could not be distinguished sufficiently from the number of data points collected to develop a master curve. Information regarding the test procedures and quantitative analysis on the effects of the individual forces are included.
- Polymer Chemistry
- Laminates and Composite Materials