Accession Number : AD0720696

Title :   An Isotropic Theory for Dewettable Solids.

Descriptive Note : Technical rept.,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Lindsey,G. H. ; Wood,J. E.

Report Date : 31 JAN 1971

Pagination or Media Count : 72

Abstract : Fundamental concepts have been formulated for the mechanical behavior of isotropic, elastic materials that dewet. This has been accomplished through an examination of the stability concepts underlying the classical inviscid theory of plasticity. From a phenomenological viewpoint, the two theories differ in the nature of unloading, the dilatation behavior, the form taken by the dewetting criterion, which is analogous to the yield criterion of plasticity theory. Some restrictions to an allowable functional form of the dewetting criterion are developed, and a specific criterion compatible with these restrictions is suggested. A time-temperature superposition method is developed, using the proposed criterion coupled with reaction rate theory. Stress analysis for materials which exhibit anisotropy after dewetting is discussed, and sample problem solutions are given for quasi-elastic pressurization and slow cool-down of an encased hollow cylinder in plane strain, in which the extent of dewetting increases with time. (Author)

Descriptors :   (*COMPOSITE PROPELLANTS, *STRUCTURAL PROPERTIES), PLASTIC PROPERTIES, ISOTROPISM, POLYMERS, STRESSES, STRAIN(MECHANICS), FRACTURE(MECHANICS), THESES

Subject Categories : Mechanics
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Distribution Statement : APPROVED FOR PUBLIC RELEASE