Failure Prediction of Underwater Structures - Subdomain Decomposition and Meshfree Methods

Abstract

Meshfree methods for fracture have been extended by considering more general classes of basis functions. These methods do not require any elements, and boundaries and interfaces, such as cracks, are easy to propagate in the model since it does not involve remeshing. The versatility of these methods has been enhanced by developing new vector level set methods. The method has been applied to a variety of crack growth problems in two dimensions including problems involving welds and fillets. Comparisons with experiments show excellent agreement. Domain decomposition methods, whereby a fine scale model can be linked with a coarse scale model were developed. These methods are useful when a part of a ship where severe damage is expected must be modeled by a refined mesh for accuracy and linked to a coarser mesh of the remainder of the ship.

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Document Details

Document Type
Technical Report
Publication Date
Nov 15, 2003
Accession Number
ADA419062

Entities

People

  • Ted Belytschko

Organizations

  • Northwestern University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Boundaries
  • Computational Fluid Dynamics
  • Computational Science
  • Crack Tips
  • Decomposition
  • Differential Equations
  • Engineering
  • Equations
  • Equations Of Motion
  • Failure Mode And Effect Analysis
  • Frequency
  • Materials
  • Mechanical Engineering
  • Mechanics
  • Scale Models
  • Two Dimensional
  • Underwater Structures

Readers

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