DTIC ADA131271: Finite Element Analysis of Shock pdf

DTIC ADA131271: Finite Element Analysis of Shock

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Description of the Book:

This report describes a new version of the USA-STAGS code that can treat the problem of hull cavitation of submerged structures subjected to underwater shock. In addition, this version can also be applied to the analysis of submerged structures that include internal fluid volumes. In the present implementation, the Doubly Asymptotic Approximation (DAA) serves to simulate a radiation boundary that is located away from the fluid-structure surface at a distance sufficient to contain any cavitating region. The enclosed fluid is discretized with volume finite elements that are based upon a displacement potential formulation due to R. E. Newton. An explicit time integration method is used to advance the solution in the fluid-volume region. An implicit time integration method is still used for the structure and DAA boundary, while the staggered solution procedure has been modified to treat the interface conditions that arise from the presence of the fluid-volume elements.

Results for two example problems obtained with the new software show excellent agreement with those obtained by other methods

• Creator/s: Defense Technical Information Center
• Date: 2/26/1982
• Year: 1982
• Book Topics/Themes: DTIC Archive, Felippa, C A, LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA, *CAVITATION, *SHOCK WAVES, COMPUTER APPLICATIONS, FINITE ELEMENT ANALYSIS, SUBMARINE HULLS, SUBMERSIBLES, UNDERWATER STRUCTURES

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