Fundamental Studies of Novel Contact-Damage Resistant Ceramics

Abstract

The concept of elastic-modulus-graded ceramics for improved resistance to quasi-static contact damage (Hertzian-indentation), sliding-contact damage, and wear was investigated. In these graded materials, the in-plane elastic modulus (E) is low at the contact surface and high in the interior (substrate) with a continuous, or step-wise continuous, E-gradation in-between. Processing strategies for fabricating such E-graded ceramic composites in the A12O3(-)glass, the Si3N4(-)glass, and the Si3N4(-)SiC systems are described. The Hertzian indentation (quasi-static and sliding) behavior of these composites, along with some results from wear tests, are presented. Computational modeling (finite-element analysis or FEA) results are also presented, and are used to discuss the role of E-gradients in imparting contact-damage resistance to these materials. The use of calibrated FEA models as predictive tools for the design of next-generation graded materials is also discussed.

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Document Details

Document Type
Technical Report
Publication Date
Aug 25, 2003
Accession Number
ADA417740

Entities

People

  • Nitin P. Fadture
  • Subra Suresh

Organizations

  • University of Connecticut

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Advanced Materials
  • Composite Materials
  • Computational Modeling
  • Elastic Properties
  • Materials
  • Materials Engineering
  • Materials Processing
  • Materials Science
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Modulus Of Elasticity
  • Plastic Properties
  • Prostheses And Implants
  • Residual Stress
  • Tensile Stress
  • Wear Resistance

Fields of Study

  • Materials science

Readers

  • Computational Fluid Dynamics (CFD)
  • Reinforced Composite Materials
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).