Accession Number : AD0631773

Title :   ON THE EFFECTS OF SOURCE PROXIMITY ON THE DYNAMIC STRESSES AROUND A CYLINDRICAL CAVITY,

Corporate Author : RAND CORP SANTA MONICA CALIF

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

Report Date : APR 1966

Pagination or Media Count : 48

Abstract : An analysis is presented and numerical results are given of the interaction of a cylindrical wave impinging on a cylindrical cavity. It is assumed that a line source is located at an arbitrary distance from the cavity and that its strength varies harmonically in time. The resulting dynamic-stress-concentration factors around the cavity were determined by considering the wave-diffraction effects around the cavity. Numerical results indicate that the dynamic-stress-concentration factors around the cavity are dependent upon (1) distance from the source to the cavity, (2) wave numbers, and (3) the Poisson ratio of the medium. It is also shown that at high wave number (high frequency) the cylindrical-incident-wave problem becomes almost identical to the plane-wave problem; however, at low wave number, the solution presented in this Memorandum departs drastically from all previous investigations where the incident wave is assumed to be a plane wave. Stress-concentration factors as much as 66 percent higher than those determined in earlier studies were noted in the present analysis. (Author)

Descriptors :   (*NUCLEAR EXPLOSION DAMAGE, *UNDERGROUND STRUCTURES), (*CYLINDRICAL BODIES, STRESSES), SHOCK WAVES, DIFFRACTION, FREQUENCY, MECHANICAL WAVES

Subject Categories : Structural Engineering and Building Technology
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE