Dynamic Finite Element and Dynamic Photoelastic Analyses of an Impacted Pretensioned Plate.

Abstract

Dynamic finite element and dynamic photoelasticity were used to analyze ESSO type fracture toughness specimen machined from Homalite-100 sheets of 9.5 mm thickness. Crack velocities determined from photoelasticity experiments were prescribed in the dynamic finite element analysis for the purpose of establishing numerically a dynamic fracture toughness which varies with the crack velocity. Qualitative agreement between dynamic energy release rates determined by the two procedures were found, provided an appropriate impuse was prescribed in the dynamic finite element analysis. The dymamic finite element analysis also provided results with sufficient time resolution to confirm our postulage that K sub d = K sub c at the onset of crack propagation in Homalite-100 plates and that K sub a varies in these test specimens. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1976
Accession Number
ADA031226

Entities

People

  • A. F. Emery
  • Albert S. Kobayashi
  • S. Mall

Organizations

  • University of Washington

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • California
  • Contracts
  • Crack Propagation
  • Crack Tips
  • Cracks
  • Engineering
  • Finite Element Analysis
  • Mechanical Engineering
  • Mechanics
  • Military Research
  • Muzzle Velocity
  • Projectiles
  • Shear Stresses
  • Stress Intensity Factors
  • Stress Waves
  • Stresses
  • United States

Readers

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