Sensor and Actuator Materials for High Performance Composites

Abstract

The residual stresses in sapphire fibers embedded in a number of ceramic and inter-metallic matrices are measured non-destructively and in-situ using the stress-induced frequency shift in fluorescence from chromium dopants in the fibers. The stresses as a function of depth into the fibers from the free surface are measured and from the depth profile we have determined the interfacial shear stresses between the fibers and the matrices. The stress distributions provide a validation of the shear lag mechanics models of Hutchinson and Jensen, as well as a test of finite element computations.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1991
Accession Number
ADA254178

Entities

People

  • A. G. Evans
  • D. R. Clarke

Organizations

  • University of California, Santa Barbara

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Crystal Structure
  • Dielectric Permittivity
  • Diffraction
  • Elastic Properties
  • Electric Fields
  • Electromagnetic Fields
  • Frequency Shift
  • Materials
  • Materials Processing
  • Mechanical Working
  • Mechanics
  • Modulus Of Elasticity
  • Phase Transformations
  • Piezoelectric Effect
  • Scattering
  • Stress Waves
  • Stresses

Readers

  • Materials Science (Mechanical Engineering).
  • Structural Health Monitoring of Composite Structures.
  • Thin Film Deposition Science.