Accession Number : ADA130663

Title :   Convergence of Modal Series in a Plate Struck by a Shock Wave.

Descriptive Note : Progress rept. Nov 81-Apr 82,


Personal Author(s) : Schechter,R S ; Bort,R L

PDF Url : ADA130663

Report Date : 21 Jul 1983

Pagination or Media Count : 43

Abstract : Numerical calculations are shown for a simplified model of a plate subjected to a pressure pulse and a base motion while immersed in an acoustic fluid. Modal series for deflection and velocity converged promptly, but it was found that 20 thin-beam modes were needed to represent time-history bending stresses along the length of a particular steel plate mounted as a cantilever immersed in sea water. A criterion is proposed for calculation of stresses in fluid-structure interactions: the structure must be modeled in enough detail so that individual motions are controlled by stiffness of the structure, with less than 20 percent of critical damping from acoustic radiation.

Descriptors :   *Submarine models, *Underwater explosions, *Numerical analysis, Plates, Pressure, Pulses, Shock(Mechanics), Structural analysis, Theory, Equations of motion, Experimental design, Accuracy

Subject Categories : Statistics and Probability
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE