Accession Number : ADA317196

Title :   Failure Analysis for Polycarbonate Transparencies,

Descriptive Note : Final rept. 1 Dec 93-1 Sep 95,

Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OH

Personal Author(s) : Salee, Gideon ; Taylor, S. K. ; Heater, Kenneth

PDF Url : ADA317196

Report Date : SEP 1994

Pagination or Media Count : 64

Abstract : 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.

Descriptors :   *FAILURE, *FRACTURE(MECHANICS), *POLYCARBONATES, *TRANSPARENCIES, STRESSES, DATA BASES, QUANTITATIVE ANALYSIS, AGING(MATERIALS), PREDICTIONS, TEST METHODS, GLASS, TIME, BRITTLENESS, DUCTILE BRITTLE TRANSITION, TRANSITION TEMPERATURE, AIRCRAFT CANOPIES.

Subject Categories : Polymer Chemistry
      Aircraft
      Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE