Accession Number : AD0710796

Title :   SIMILARITY BETWEEN CREEP RUPTURE IN VISCOELASTIC SOLIDS AND FATIGUE IN METALS.

Descriptive Note : Final rept. 1969-1970,

Corporate Author : SOUTH DAKOTA STATE UNIV BROOKINGS DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Wnuk,Michael P.

Report Date : AUG 1970

Pagination or Media Count : 48

Abstract : A local energy criterion of Irwin's type is applied to a problem of a quasi-static extension of a crack embedded in an elastic-plastic or visco-elastic-plastic matrix. A nonlinear differential equation is given which governs subcritical growth up to the point of gross instability. The creep rupture under sustained loads and fatigue crack propagation, both described by the equation, are shown to follow almost identical mathematical representations. The essential features such as the universal resistance curves, the dependence of growth rate on the current K-factor and the amount of growth vs. time relations are shown to be strikingly similar. (Author)

Descriptors :   (*CREEP, SOLIDS), (*FATIGUE(MECHANICS), METALS), RUPTURE, VISCOELASTICITY, FRACTURE(MECHANICS), NONLINEAR DIFFERENTIAL EQUATIONS

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE