Separation of Fracture-Induced Anisotropy from Background Anisotropy.

Abstract

The scientific research goals of this project were to evaluate the effects and determine the amount of oriented, periodic fractures in both heterogeneous, layered isotropic and anisotropic materials by nondestructive evaluation (NDE) methods. The approach was to measure nondestructively the elastic constants of a bulk fractured composite material in order to adequately characterize the material and provide damage assessment. In addition, the effects of the heterogeneous and anisotropic nature of fractured composite materials on plane elastic wave propagation were to be investigated. This work was to involve development of analysis and verification of methods of the quantitative NDE of elastic wave propagation and bulk elastic properties of anisotropic, heterogeneous materials. Work was planned to evaluate wave propagation characteristics in terms of orthorhombic symmetries resulting from fractures embedded in layered composites so as to allow the estimation of fracturing in materials which already possess an inherent anisotropy due to their layering.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1995
Accession Number
ADA300650

Entities

People

  • Julie A. Hood

Organizations

  • University of Miami

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Anisotropy
  • Composite Materials
  • Damage Assessment
  • Elastic Properties
  • Elastic Waves
  • Geophysical Prospecting
  • Long Wavelengths
  • Materials
  • Measurement
  • Phase Velocity
  • Scientific Research
  • Symmetry
  • Technical Information Centers
  • Ultrasounds
  • Wave Propagation
  • Waves

Readers

  • Materials Science and Engineering.
  • Ocean-Atmosphere Mesoscale Modeling, Data Assimilation, and Flux Boundary Layers
  • Structural Health Monitoring of Composite Structures.