A Review of Nondestructive Methods for the Detection of Concealed Cracks.

reportActive / Technical Report | Accession Number: AD0746268 | Need Help?

Abstract:

The report is a discussion of NDI methods for detecting concealed cracks with emphasis on crack detection under fasteners and painted and plated surfaces. Many methods are considered. They are classified as recommended, potentially applicable, and inapplicalbe. The recommended methods are ultrasonic and eddy current. They are now field applicable. An ultrasonic method can be immediately applied to detecting cracks under fasteners and plated and painted surfaces. Eddy currents can be used to detect cracks that have propagated beyond fastener heads, in fastener holes after removal of fasteners and under protective surfaces. Between the two they should allow inspection of most geometries of interest. Author

Author(s):
Kamm, H. W. ; Kraska, I. R.
Author Organization(s):
GENERAL AMERICAN TRANSPORTATION CORP NILES ILL GENERAL AMERICAN RESEARCH DIV
Descriptive Note:
Technical rept.,
Pagination:
0031

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFML-TR-71-120
Contract/Grant Number(s):
F33615-68-C-1429
Task Number(s):
735109
Project Number(s):
AF-7351
Monitor Series:
TR-71-120
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*DEFECTS(MATERIALS), *NONDESTRUCTIVE TESTING, *AIRFRAMES, CRACKS, FASTENINGS, CRACK PROPAGATION, VISUAL INSPECTION, MAGNETIC PROPERTIES, RADIOGRAPHY, STEREOPHOTOGRAPHY, ELECTRIC FIELDS, ULTRASONIC RADIATION, IMAGES, ACOUSTIC SIGNALS, ACCEPTABILITY
Field(s)/Group(s):
Aircraft, Test Facilities, Equipment and Methods
Keyword(s):
*MAGNETIC PARTICLE TESTS, *HOLOGRAPHY, *ULTRASONIC TESTS, *DYE PENETRANT TESTS, *EDDY CURRENT TESTS
Report Date:
1971 Jul 01