Utility of a Probability Density Function Curve and F-Maps in Composite Material Inspection.

Abstract

The subject of probability density function analysis, an important topic in statistical analysis, is studied in detail in this paper for its utility in nondestructive testing. In addition to the mathematical concepts and analysis, several sample problems in composite material inspection are presented. An F-map, or feature map, presentation is also presented that gives us a new way to examine composite materials. A probability density function basically gives us a plot of the number of times that a particular feature is recorded versus the feature valve itself, a feature being defined as a specific item related to an ultrasonic waveform, possibly center frequency, attenuation at a particular frequency, etc. Probability density function curves are also used to set threshold values in producing an F-map. Sample problems in a graphite polyimide structure and a Boron Aluminum material are covered. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Feb 13, 1980
Accession Number
ADA085803

Entities

People

  • Joseph L. Rose
  • Michael J. Avioli
  • Yi H. Jeong

Organizations

  • Drexel University

Tags

Communities of Interest

  • Space

DTIC Thesaurus Topics

  • Composite Materials
  • Composite Structures
  • Computers
  • Damage Assessment
  • Engineering
  • Fabrication
  • Frequency
  • Inspection
  • Manufacturing
  • Materials
  • Materials Science
  • Materials Testing
  • Nondestructive Testing
  • Pattern Recognition
  • Probability Density Functions
  • Quality Control
  • Test Methods

Readers

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