Stress Intensity Solutions of Thermally Induced Cracks in Combustor Liner Hot Spots Using Finite Element Analysis (FEA)

Abstract

Developing stress intensity solutions for thermal strain inducing cracking in hot spots is the chief goal of this research. Using finite element analysis (FEA) to model the stress state and crack stress intensities resulting from thermal gradients, a model is needed to represent and predict this cracking and eventual crack arrest in combustor liners in turbine engines. In determining the number of cycles until the crack arrests, the model estimates the number of cycles within 5 when compared to the actual 462 experimental cycles run. While the K vs. a curve used for this estimation indicates a relatively high would-be Kth value, the model shows that repeated cycles at the same crack length would produce a lower, more accurate K level at the length that the crack arrests.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2005
Accession Number
ADA450027

Entities

People

  • Donald W. Rhymer

Organizations

  • Georgia Tech Research Corporation

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Air Force Research Laboratories
  • Combustors
  • Creep
  • Engines
  • Experimental Data
  • Finite Element Analysis
  • Fracture (Mechanics)
  • Gas Turbines
  • Hot Spots
  • J Integrals
  • Mechanics
  • Modulus Of Elasticity
  • Plastic Properties
  • Stress Strain Relations
  • Temperature Gradients
  • Tensile Stress
  • Turbines

Readers

  • Computational Modeling and Simulation
  • Materials Science (Mechanical Engineering).
  • Thermal Physics or Thermal Science.