Contrails
The goal of the Contrails project is to help preserve and disseminate the technical record of 20th century aerospace research, highlighting in particular the research endeavors of the Illinois Tech community.

Development of a Nondestructive Testing Technique to Determine Flaw Criticality

Report Number: AFML TR 71-218
Author: Hartbower, C. E.
Author: Reuter, W. G.
Author: Crimmins, P. P.
Author: Morais, C. F.
Corporate Author: Aerojet Solid Propulsion Company
Laboratory: Air Force Materials Laboratory
Date of Publication: 1972-01
Pages: 240
Contract: F33615-68-C-1705
Project: None Given
AD Number: AD0747225

Abstract:
The report presents the findings of a study to develop a nondestructive testing technique to determine flaw criticality based upon stress-wave emission. The research included an evaluation of various sensors and instrumentation systems, and several materials and material conditions tested to failure in rising load and low-cycle, high-stress-intensity fatigue. The fracture testing utilized a linear-elastic fracture-mechanics approach. Acoustic emission was the basis of the nondestructive inspection technique. The stress-wave-analysis technique (SWAT) was shown to be a highly sensitive nondestructive inspection method, capable of detecting growing defects at least an order of magnitude smaller than any other known NDI method and, with a computerized system, capable of locating one or more defects in real time.


Provenance:
Lockheed Martin Missiles & Fire Control
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