Accession Number : AD0263870

Title :   GROUND SHOCK ISOLATION OF BURIED STRUCTURES

Corporate Author : IIT RESEARCH INST CHICAGO ILL

Personal Author(s) : SEVIN,E. ; SHENKMAN,S. ; WELCH,E.

Report Date : JUL 1961

Pagination or Media Count : 1

Abstract : Small aluminum cylinders (2 in. diam. x 8 in. long) were embedded in dry Ottawa sand and subjected primarily to the ground shock components of an HE charge. Accelerometer mounted on the models are used to measure the motions of the models. Various devices were then employed on or about the models to alleviate the induced motions as compared to the unisolated response. These isolation devices consisted of open and closed cell polyester urethane foams and loose and dense sand contained in a stovepipe. In addition, variations in model response with changes in over-all bed density were investigated. The study demonstrated that model accelerations generally increase with increasing bed density and that the effectiveness of isolation systems must be measured relative to the characteristics of the over-all bed. It is also shown that the high frequency components of model response are important for models placed close to the charge. The study reinforced previous conclusions regarding the validity of testing procedures and the effectiveness of soft foam isolation. (Author)

Descriptors :   *DETONATION WAVES, *SHOCK WAVES, *VIBRATION, ACCELEROMETERS, EXPERIMENTAL DATA, EXPLOSIVES, INSTRUMENTATION, MEASUREMENT, PRESSURE, PRODUCTION, PROPAGATION, SOILS

Distribution Statement : APPROVED FOR PUBLIC RELEASE