Accession Number : AD0712046
Title : A SELF-CONSISTANT POLYCRYSTALLINE MODEL FOR CREEP UNDER COMBINED STRESS STATES.
Descriptive Note : Technical rept.,
Corporate Author : BROWN UNIV PROVIDENCE R I DIV OF ENGINEERING
Personal Author(s) : Brown,G. M.
Report Date : JUL 1970
Pagination or Media Count : 36
Abstract : The application of the self consistent polycrystalline model of inelastic deformation has been extended to include time dependent (i.e. creep) behavior. Comparison of the predictions of a simple power law microconstitutive relation in the model with experiments, suggests that an appreciable amount of the observed dependence of behavior on prior history of combined stressing can be explained by grain interaction effects. The existence of a flow potential for the self consistent polycrystalline model is demonstrated, and flow potential surfaces, calculated from a simple power law microconstitutive relation, are shown for several cases of combined tension-torsion deformation. To a good approximation, these surfaces exhibit a kinematic translation in stress space with prior deformation history. (Author)
Descriptors : (*CREEP, MATHEMATICAL MODELS), STRESSES, STRAIN(MECHANICS), DEFORMATION, CRYSTALS
Subject Categories : Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE