Dynamic Elasto-Plastic Response of Shells in an Acoustic Medium - Theoretical Development for the EPSA Code

Abstract

The EPSA (Elastic-Plastic Shell Analysis) code has been developed for the analysis of shells in an acoustic medium subjected to dynamic loadings which produce large elasto-plastic deformations in the shell. The analysis includes the modeling of significant internal structures, which produce hard spots on the shell. In addition, the effects of ambient pressure are considered. This report presents the theoretical development for the EPSA code and a description of the code itself. A users manual for EPSA is planned for the future. The structural equations of motion are derived from the principle of virtual work and descretized over the shell in a manner typical of finite element procedures. The integration in time of the equations of motion are done explicitly via a central difference scheme. The nonlinear Donnell-Vlasov kinematic equations of shell theory are used. Plate strain-displacement relations are established by a two dimensional finite difference scheme.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1978
Accession Number
ADA064102

Entities

People

  • M. L. Baron
  • M. P. Bieniek
  • R. Atkatsh

Tags

Communities of Interest

  • Counter WMD
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Cartesian Coordinates
  • Civil Engineering
  • Classification
  • Constitutive Equations
  • Dynamic Response
  • Engineering
  • Engineers
  • Equations
  • Equations Of Motion
  • Explosions
  • Explosives
  • Geometry
  • Mechanics
  • Plastic Deformation
  • Two Dimensional

Fields of Study

  • Engineering
  • Physics

Readers

  • Computer Science.
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Structural Dynamics.