Quantitative Characterization of Fretting Damage in Aircraft Turbine Disks

Abstract

A feasibility study was completed to evaluate a low cost, robust optical inspection method for detecting and characterizing fretting damage on metal suffaces. The effects of the quality and type of the light illumination and the angle of the illumination were measured. Dark field and light field imaging were used to generate images to measure the size of fretting areas. A signal dependence upon the depth of the surface roughness and the illumination angle was demonstrated. The artifacts introduced by the camera image acquisition system were found to be important to successful image processing and means were developed to remove them. Image processing methods based on morphological operations were developed to determine the fretting region of interest in the image. The study demonstrated a method of fretting surface characterization.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 2000
Accession Number
ADA396375

Entities

People

  • Feyzi Inanc
  • Joseph N. Gray
  • Lalita Udpa

Organizations

  • Iowa State University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Acquisition
  • Aircrafts
  • Algorithms
  • Angle Of Incidence
  • Data Acquisition
  • Detection
  • Feature Extraction
  • Fretting
  • Gray Scale
  • Illumination
  • Image Processing
  • Images
  • Light Sources
  • Materials
  • Optical Images
  • Specular Reflection
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Computer Vision.
  • Structural Health Monitoring of Composite Structures.