Accession Number : AD0619246

Title :   ON THE EFFECTS OF STRESS-WAVE DIFFRACTION ON GROUND-SHOCK MEASUREMENTS: PART II,

Corporate Author : RAND CORP SANTA MONICA CALIF

Personal Author(s) : Mow,C. C. ; Repnau,T.

Report Date : AUG 1965

Pagination or Media Count : 55

Abstract : In a previous study (AD-610 337, On the Effects of StressWave Diffraction of Ground-Shock Measurements: Part I), an exact solution for the response of a rigid spherical inclusion was determined. A few numerical examples were given, and results indicated tha the motions of the inclusion can be quite different from those of the free field. This Memorandum presents additional results on the effects of stress-wave diffraction on ground-shock measurements. An extensive parametric study is carried out in order to give useful numerical results for design purposes as well as to yield additional information for the general understanding of the response of an inclusion embedded in an elastic medium when subjected to stress-wave loading. Also investigated are some special instances when poles in the admittance function are of order 2 instead of just simple poles, and it is shown that they do not give rise to spurious effects. Finally, a method is given for the determination of free-field motion from the motion of the inclusion. (Author)

Descriptors :   (*SHOCK WAVES, STRESSES), (*UNDERGROUND STRUCTURES, SHOCK WAVES), MECHANICAL WAVES, LOADS(FORCES), SPHERES, ELASTIC PROPERTIES, VELOCITY, ACCELERATION, DIFFERENTIAL EQUATIONS, BOUNDARY LAYER, MOTION, MEASUREMENT

Distribution Statement : APPROVED FOR PUBLIC RELEASE