Accession Number : AD0411367

Title :   A THEORETICAL ANALYSIS OF STRESS WAVE INTERACTION IN A MODEL SOIL.

Descriptive Note : Final rept.

Corporate Author : NATIONAL ENGINEERING SCIENCE CO PASADENA CALIF

Personal Author(s) : Aggarwal,H.R. ; Soldate,A.M. ; Hook,J.F.

Report Date : JUN 1963

Pagination or Media Count : 116

Abstract : An attempt was made to formulate and solve by analytic methods a two-dimensional, plane strain problem of the interaction with an embedded structure of high-intensity stress waves travel ling in a soil-like medium. A model, chosen to represent soil behavior undre large compressional transient stresses, shows a bilinear compression al stress-strain curve in the conventional un iaxial test, with a behavior on unloading that corresponds to the behavior found experimentally in metals and certain soils. The structure chosen was a cylinder of infinite density and rigidity. The wave form chosen was a step of just suf ficient magnitude to cause yielding of the medium. Numerical solutions indicate that, after an ititial loading jump due to the impingement of the stress wave on the front face of the cylinder, unloading takes place, followed by subsequent reloading. Quantitative estimates of loadings on the front face of the cylinder during the unloading phase have thus far been obtained. (Author)

Descriptors :   (*SOIL MECHANICS, THEORY), (*MECHANICAL WAVES, STRESSES), (*SOILS, MATHE), INTENSITY, COMPRESSIVE PROP, CYLINDRICAL BODIES, DENSITY, NUMERICAL, LOADING (MECHANICS), EQUATIONS OF, PLASTIC PROPERTIES, INTEGRALS, TIME, PARTIAL, PROPAGATION, BOUNDARY, BLAST, ELASTIC PROPERTIES, UNDERGROUND

Distribution Statement : APPROVED FOR PUBLIC RELEASE