Accession Number : AD0270536

Title :   RESEARCH AND DEVELOPMENT ON ADVANCED GRAPHITE MATERIALS. VOL V. ANALYSIS OF CREEP AND RECOVERY CURVES FOR ATJ GRAPHITE

Corporate Author : NATIONAL CARBON CO INC CLEVELAND OHIO

Personal Author(s) : SELDIN,E.J. ; DRAPER,R.N.

Report Date : SEP 1961

Pagination or Media Count : 1

Abstract : Flexural creep tests were made on specimens of ATJ graphite at temperatures ranging from 2300 to 3000 C. The creep curves were fitted by graphical and analytical means to 4 equations. Of the 4 equations, one could be related to simple rheological models having some physical significance. A model was useful not only in describing the creep curves, but also in describing the recovery after creep and relating the behavior in recovery to the behavior during creep. Generally good agreement was found between the qualitative predictions of the models and the observed behavior. Using a model, an activation energy for the steady state creep rate was determined to lie between 70 and 76 kcal/mole. Some deviations were detected between the actual behavior of the material and that predicted by the simple models. (Author)

Descriptors :   *CREEP, *GRAPHITE, HIGH TEMPERATURE, MATHEMATICAL ANALYSIS, STRESSES, THEORY, VISCOSITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE