Accession Number : AD0742143

Title :   A Rate-Dependent Constitutive Model of Shock-Loaded S-200 Beryllium.

Descriptive Note : Final rept. 14 Aug 71-15 Jan 72,

Corporate Author : SYSTEMS SCIENCE AND SOFTWARE LA JOLLA CALIF

Personal Author(s) : Read,Harold E. ; Cecil,Robert A.

Report Date : APR 1972

Pagination or Media Count : 90

Abstract : A rate-dependent constitutive model is developed for the one-dimensional deformation of S-200 beryllium at room temperature. The current knowledge of dislocation dynamics is used in formulating the constitutive model from consideration of the basic physical mechanisms that are involved in plastic flow processes. The constants which arise in the model are evaluated from macroscopic data, including quasi-static strain hardening data, low-to-medium strain rate data, and stress wave profiles. A numerical scheme for incorporating this constitutive model into one-dimensional, finite-difference computer codes has been developed and implemented into the RIP code. Calculations of the attenuation of thin stress pulses show excellent agreement with experimental observations. (Author)

Descriptors :   (*BERYLLIUM, *SHOCK WAVES), PLASTIC PROPERTIES, STRESSES, DEFORMATION, PROPAGATION, CREEP, DISLOCATIONS, EQUATIONS OF STATE

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE