Crack Problems in Graded Coatings

Abstract

In this report a two-dimensional finite element technique is developed to study various mechanical, thermal and fracture mechanics problems encountered in the failure analysis of thermal barrier coatings. The system considered consists of the substrate, bond coat, thermally grown oxide and the top coat. The fracture problems studied include edge debonding, surface cracking, T-shaped cracks and periodic debond cracks along the bond coat / thermally grown oxide interface. The results obtained are mostly the stress intensity factors and the strain energy release rate. The enriched finite elements at and near the crack tip are used the simulate the asymptotic stress fields and to calculate the stress intensity factors.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 2001
Accession Number
ADA388793

Entities

People

  • Bora Yildirim
  • Fazil Erdogan

Organizations

  • Lehigh University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Barrier Coatings
  • Ceramic Coatings
  • Climate Change
  • Coatings
  • Crack Tips
  • Department Of Defense
  • Failure Mode And Effect Analysis
  • Finite Element Analysis
  • Fracture (Mechanics)
  • Geometry
  • High Temperature
  • Materials
  • Mechanics
  • Modulus Of Elasticity
  • Shear Stresses
  • Stress Intensity Factors
  • Substrates

Fields of Study

  • Engineering

Readers

  • Reinforced Composite Materials
  • Structural Dynamics.
  • Surface Coatings Technology.