Application of Ultrasonic 'F-Scan' to the Inspection of Composite Materials.

Abstract

Composites are now being used in high strength, low weight applications such as the aircraft industry. Difficulties arise in the nondestructive testing and evaluation of these materials because of their fibrous nature. The traditional ultrasonic C-scan technique is often found very limiting. A new technique called F-scanning (Feature scanning) was developed that examines many features (characteristics) of the ultrasonic wave form such as amplitude ratios and frequency shifts. These features can be better used to locate defects. This technique was used to evaluate a composite patch that had severe void content. Photomicrographs were used to determine defective and non-defective areas for correlation with the results obtained in the F-cap process. These results showed an overall index of performance of 87.5 percent correct decisions. (Author-PL).

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Document Details

Document Type
Technical Report
Publication Date
Apr 15, 1982
Accession Number
ADA114072

Entities

People

  • J. Bruce Nestleroth
  • Joseph L. Rose
  • Shahab Negahban

Organizations

  • Drexel University

Tags

Communities of Interest

  • Air Platforms
  • C4I

DTIC Thesaurus Topics

  • Composite Materials
  • Computers
  • Data Acquisition
  • Delamination
  • Epoxy Composites
  • Frequency
  • Frequency Shift
  • Graphite Epoxy Composites
  • Graphitic Materials
  • Laminates
  • Materials
  • Materials Processing
  • Mechanics
  • Nondestructive Testing
  • Surface Properties
  • Ultrasounds
  • Waveforms

Readers

  • Structural Health Monitoring of Composite Structures.
  • Systems Analysis and Design