Accession Number : ADA299939

Title :   Effects of Geometric and Material Imperfections on the Dynamic Response of Cylindrical Shells Subjected to Underwater Explosion.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Kaufman, Robert E.

PDF Url : ADA299939

Report Date : JUN 1995

Pagination or Media Count : 114

Abstract : The effects of initial geometric and material property imperfections on the non-linear dynamic response of cylindrical shells subjected to an underwater explosion was investigated. Finite element and boundary element programs were used to perform the analysis of the dynamic response of these shells. The geometric and material modal imperfections were introduced into the finite element models. The dynamic response and deformation of the cylinder were then compared for each of the eight modal imperfection cases to the dynamic response of a perfect cylindrical model. The modal imperfection distribution of the combined geometric and material imperfections are then introduced into an aluminum model and compared to experimental results obtained from underwater explosion testing. This analysis shows that a more accurate prediction of the damage and dynamic response is achieved by introducing these imperfection distributions into the numerical analysis.

Descriptors :   *DEFECTS(MATERIALS), *CYLINDRICAL BODIES, *UNDERWATER EXPLOSIONS, COMPUTER PROGRAMS, MATHEMATICAL MODELS, DENSITY, LOAD DISTRIBUTION, FINITE ELEMENT ANALYSIS, SHOCK WAVES, DISPLACEMENT, ELASTIC PROPERTIES, MODULUS OF ELASTICITY, THESES, SHELLS(STRUCTURAL FORMS), STRENGTH(MECHANICS), EXPLOSION EFFECTS, FORTRAN, STRUCTURAL RESPONSE, ALUMINUM, BUCKLING, BLAST LOADS, YIELD STRENGTH, HARDENING, POISSON RATIO.

Subject Categories : Explosions

Distribution Statement : APPROVED FOR PUBLIC RELEASE