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Accession Number:
ADA278745
Title:
Nondestructive Inspection (NDI) of Reduced Strength Bonds
Corporate Author:
GRUMMAN CORP BETHPAGE NY
Report Date:
1994-02-01
Abstract:
The goal of this project was to develop a nondestructive inspection technique capable of detecting weak adhesive bonds. The approach was to fabricate contaminated surface-induced weak bond specimens which were then used to evaluate candidate techniques and to further optimize the selected most promising technique. The results indicate the ultrasonic resonance technique showed some success in detecting weak bonds as determined through destructive test correlations conducted using the representative weak bond specimens. The technique was 97 percent effective in detecting known weak bonds but was subject to false reject error ranging between 14 and 31 percent depending upon the evaluation criteria employed. Difficulties were encountered with the destructive test correlations due to the wide variation of results experienced with the flatwise tension tests that were conducted. The ultrasonic resonance technique and a recently emerged ultrasonic feature analysisadaptive learning technique looked promising but will require further evaluation involving test specimens with large weak bond areas representing several weak bond mechanisms in addition to contaminated interfaces. Nondestructive inspection, Weak adhesive bonds, Ultrasonic Resonance technique, Ultrasonic feature analysis.
Descriptive Note:
Final rept.
Pages:
0036
Distribution Statement:
Approved for public release; distribution is unlimited.
Contract Number:
DTFA03-88-C-00016
File Size:
1.86MB
