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Optimizing Probability of Detection Point Estimate Demonstration Probability of detection (POD) analysis is used in assessing reliably detectable flaw size in nondestructive evaluation (NDE). MIL-HDBK-18231and associated mh18232POD software gives most common methods of POD analysis. Real flaws such as cracks and crack-like flaws are desired to be detected using these NDE methods. A reliably detectable crack size is required for safe life analysis of fracture critical parts. The paper provides discussion on optimizing probability of detection (POD) demonstration experiments using Point Estimate Method. POD Point estimate method is used by NASA for qualifying special NDE procedures. The point estimate method uses binomial distribution for probability density. Normally, a set of 29 flaws of same size within some tolerance are used in the demonstration. The optimization is performed to provide acceptable value for probability of passing demonstration (PPD) and achieving acceptable value for probability of false (POF) calls while keeping the flaw sizes in the set as small as possible.
Document ID
20170002582
Document Type
Presentation
Authors
Koshti, Ajay M.
(NASA Johnson Space Center Houston, TX, United States)
Date Acquired
March 27, 2017
Publication Date
March 25, 2017
Subject Category
Structural Mechanics
Report/Patent Number
JSC-CN-38674
Meeting Information
SPIE Smart Structures/NDE 2017(Portland, OR)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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