Reliable Ceramic Structural Composites Designed with a Threshold Strength

Abstract

Finite element analysis was carried out to predict the threshold strength of a laminar ceramics loaded parallel to the layers. These materials are composed of alternate layers of two different ceramics in which residual stress is generated. Strength limiting cracks are trapped by the compressive layers and require a minimum (threshold) applied stress to cause them to fail the laminated ceramic. The calculations were utilized to study the influence of the elastic modulus mismatch between the alternate tensile and compressive layers. Good agreement was established between numerical simulations and theoretical results for materials involving layers with the same elastic properties. Results were obtained for a variety of combinations of different ceramics and suggest that threshold strength as high as three times the effective residual stress in the compressive layer is conceivable.

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Document Details

Document Type
Technical Report
Publication Date
Apr 30, 2001
Accession Number
ADA386840

Entities

People

  • Fred F. Lange
  • Kais Hbaieb
  • Robert M. Mcmeeking

Organizations

  • University of California, Santa Barbara

Tags

DTIC Thesaurus Topics

  • Crack Propagation
  • Crack Tips
  • Elastic Properties
  • J Integrals
  • Materials
  • Mechanical Properties
  • Mechanics
  • Modulus Of Elasticity
  • Residual Stress
  • Residuals
  • Simulations
  • Stress Intensity Factors
  • Stresses
  • Tensile Stress

Fields of Study

  • Materials science

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Mechanical Engineering/Mechanics of Materials.
  • Systems Analysis and Design