Interactions of Stress Waves with Cracks in Rock Media

Abstract

A number of model problems involving the elastic deformation of a body perforated by a pore or crack have been solved. For each of these problems effective elastic moduli are defined as a function of the flaw content. These effective elastic parameters are introduced into the Griffith criterion and flaw growth is followed. A cubic viscosity has been introduced into the SHEP Program. The purpose of this fictive term is to provide better control over the oscillation introduced in an algorithm based on a difference scheme and also based on out-of-plane motion. By contrast, quadratic viscosity which is ordinarily used does not control out-of-plane motion.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1972
Accession Number
AD0751546

Entities

People

  • Paul J. Blatz

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Algorithms
  • Bulk Modulus
  • California
  • Cartesian Coordinates
  • Classification
  • Complex Variables
  • Contracts
  • Corporations
  • Equations
  • Materials
  • Mechanics
  • Modulus Of Elasticity
  • Security
  • Stress Waves
  • Stresses
  • Viscosity
  • Waves

Readers

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