Accession Number:

ADA169009

Title:

An Analysis of Explosion-Induced Bending Damage in Submerged Shell Targets,

Descriptive Note:

Corporate Author:

NAVAL SURFACE WEAPONS CENTER DAHLGREN VA

Personal Author(s):

Report Date:

1984-12-01

Pagination or Media Count:

80.0

Abstract:

An underwater explosion gives rise to a violently oscillating bubble containing detonation gases. The oscillations cause pulses to impinge on a nearby submerged structure which, under some conditions, produce low frequency bending motion. The amplitude of the bending motion frequently is large enough to correspond to severe plastic deformation and bend-buckling. An analysis for this problem can be performed by treating the structure as a cylindrical shell subjected to two end couples set up by longitudinal membrane stresses. Such stresses are known to induce axial buckling andor ovalization or plastification of the cross-section. As a first approximation, and in view of the low frequency response, inertia is neglected in this analysis. Bending moment and work done on the structure are determined as a function of mean curvature. Computational results are presented for several shell geometries and published experimental data for these models compare favorably with the computations. Author

Subject Categories:

  • Explosions

Distribution Statement:

APPROVED FOR PUBLIC RELEASE