Accession Number : ADA305920

Title :   Simplified Finite Element Modeling of Stiffened Cylinders Subjected to Underwater Explosion.

Descriptive Note : Progress rept. 1 May 95-29 Feb 96,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Cunningham, Richard E. ; Kwon, Young W.

PDF Url : ADA305920

Report Date : 29 FEB 1996

Pagination or Media Count : 118

Abstract : Simplified finite element modeling of a stiffened cylinder subjected to underwater explosion was investigated. The use of smearing the stiffeners onto the base structure as well as beam modeling using SOR (Surface of Revolution) beam elements were used in the simplification process. The dynamic response and overall global deformation were then compared between the fully discretized stiffened cylinder model and simplified models. The study first examined the effectiveness of smearing stiffeners onto a flat plate. The smearing of stiffeners onto a cylindrical shell orthotropically was then examined. Next, beam modeling of both unstiffened and stiffened cylinders was investigated. Finally, an integrated beam/shell model of a stiffened cylinder was developed. These models were subjected to the same underwater explosive loading for numerical study. The analysis showed that when comparing the dynamic responses caused by underwater explosions between the discrete model, the beam model, and the beam/shell model of a stiffened or unstiffened cylinder, globally similar results could be produced. (AN)

Descriptors :   *MATHEMATICAL MODELS, *STIFFENED CYLINDERS, *UNDERWATER EXPLOSIONS, COMPUTER PROGRAM DOCUMENTATION, FINITE ELEMENT ANALYSIS, STATIC LOADS, STRUCTURAL ANALYSIS, STRUCTURAL MECHANICS, BEAMS(STRUCTURAL), DEFORMATION, DYNAMIC RESPONSE, SHOCK WAVES, STIFFNESS, EXPLOSIVE CHARGES, NUMERICAL ANALYSIS, MODULUS OF ELASTICITY, STIFFENING, ACCURACY, SHELLS(STRUCTURAL FORMS), EXPLOSION EFFECTS, CYLINDRICAL BODIES, APPROXIMATION(MATHEMATICS), BLAST LOADS, DYNAMIC LOADS, AXIAL LOADS, FLEXIBLE STRUCTURES, UNDERWATER STRUCTURES, FLAT PLATE MODELS, BODIES OF REVOLUTION.

Subject Categories : Explosions
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE