Nondestructive test method detects cracks in materials of low conductivity. Test setup includes eddycurrent unit with frequency of 2 to 20 MHz/ and storage oscilloscope. High frequency required to assure depth of penetration less than substrate thickness, to prevent thickness from influencing reading. Eddy-current analysis confirmed by visual inspection as damaged area was sectioned and evaluated.
Eddy-Current Damage Test for Carbon Composites
NASA Tech Briefs ; 7 , 4
1983-10-01
Miscellaneous
No indication
English
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