Implementation of a Shell Element with Pressure and Void Effects Into DYSMAS

Abstract

A shell formulation was developed from a three-dimensional solid. Tile shell element has four comer nodes at which there are three displacements and three rotations as nodal degrees of freedom, and includes both transverse shear and transverse normal deformations. Tile element utilizes reduced integration along the in-plane axes and fill integration along the transverse axis. Tile formulation incorporates the Gurson constitutive model for void growth and plastic deformation. An algorithm for stable solutions of the nonlinear constitutive equations is also developed. Hourglass mode control is provided by adding a small fraction of internal force determined through fill integration along the in-plane axes and reduced integration along the transverse axis. Implementation into both a specialized research finite element program and DYSMAS, a derivative of DYNA3D, is discussed. Numerical examples are provided to verify the accuracy of the new element and to show the importance of the transverse normal stress, void effects on plastic strain, and the necessity of applying a drilling moment.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1999
Accession Number
ADA370807

Entities

People

  • Patrick M. Mcdermott
  • Young W. Kwon

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • C4I

DTIC Thesaurus Topics

  • Algorithms
  • Computer Programs
  • Constitutive Equations
  • Coordinate Systems
  • Equations
  • Geometric Forms
  • Geometry
  • Lines (Geometry)
  • Mechanics
  • Modulus Of Elasticity
  • Plastic Deformation
  • Plastic Flow
  • Plastic Properties
  • Stress Strain Relations
  • Stresses
  • Three Dimensional
  • Two Dimensional

Readers

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