NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Applicability of a Conservative Margin Approach for Assessing NDE Flaw DetectabilityNondestructive Evaluation (NDE) procedures are required to detect flaws in structures with a high percentage detectability and high confidence. Conventional Probability of Detection (POD) methods are statistical in nature and require detection data from a relatively large number of flaw specimens. In many circumstances, due to the high cost and long lead time, it is impractical to build the large set of flaw specimens that is required by the conventional POD methodology. Therefore, in such situations it is desirable to have a flaw detectability estimation approach that allows for a reduced number of flaw specimens but provides a high degree of confidence in establishing the flaw detectability size. This paper presents an alternative approach called the conservative margin approach (CMA). To investigate the applicability of the CMA approach, flaw detectability sizes determined by the CMA and POD approaches have been compared on actual datasets. The results of these comparisons are presented and the applicability of the CMA approach is discussed.
Document ID
20070016672
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Koshti, ajay M.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 23, 2013
Publication Date
April 16, 2007
Subject Category
Mechanical Engineering
Meeting Information
Meeting: Aging Aircraft 2007
Location: Palm Springs, CA
Country: United States
Start Date: April 16, 2007
End Date: April 19, 2007
Sponsors: Department of the Air Force, Federal Aviation Administration, NASA Headquarters
Funding Number(s)
WBS: WBS 377816.06.02.05.03.08.01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
No Preview Available