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New and Refined Nondestructive Techniques for Graphite Billets and Shapes

Title: New and Refined Nondestructive Techniques for Graphite Billets and Shapes
Date: 1971
Index Abstract: Coming Soon
Photo Quality: Incomplete
Report Number: AFML TR 70-212 Part 2
Creator: Oaks, A. E.
Corporate Author: General Electric Company
Laboratory: Air Force Materials Laboratory
Extent: 161
Identifier: AD0736774
Distribution Classification: 1
Contract: F33615-69-C-1623
DTIC Record Exists: No
Distribution Change Authority Correspondence: None
Abstract: The limits of utility of several advanced NDT approaches for detecting small flaws in graphite were evaluated. Of these, focal plane ultrasonic inspection was found to be the most successful in delineating defects (in depths of from 0.060 to 4 in.) down to 0.020 to 0.030 in. diameter in ATJ-S and 0.010-in. diameter in AXF-90 graphite. For nearer surface inspection 1 MHz differential eddy current techniques can be applied to detect voids down to approximately 0.010 x 0.010 in. For billet and part inspection slit radiographic techniques were found to reduce scatter and parallax distortion induced image degradation and to achieve 10 to 15 percent improvements in the film contrast and defect resolution achieved with graphite.
Report Availability: Full text available by request
DoD Project: 7351 - Metallic Materials
Date Issued: 1971-07
Type: report
Provenance: Lockheed Martin Missiles & Fire Control