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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

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.

Lockheed Martin Missiles & Fire Control
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