NASA NTRS · 19870000023
Eddy-Current Detection of Weak Bolt Heads
Abstract
Electronic test identifies flawed units passing hardness tests. Eddy-current test detects weakness in head-to-shank junctions of 1/4-28 cup-washer lock bolts. Developed for alloy A286 steel bolts in Space Shuttle main engine fuel turbo-pump. Test examines full volume of head, including head-to-shank transition and nondestructively screens out potentially defective units. Test adapts to any other alloys.
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Messina, C. P.. 1987-01-01. Eddy-Current Detection of Weak Bolt Heads. https://ntrs.nasa.gov/citations/19870000023
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