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Structural Design Methodology Based on Concepts of UncertaintyIn this report, an approach to damage-tolerant aircraft structural design is proposed based on the concept of an equivalent "Level of Safety" that incorporates past service experience in the design of new structures. The discrete "Level of Safety" for a single inspection event is defined as the compliment of the probability that a single flaw size larger than the critical flaw size for residual strength of the structure exists, and that the flaw will not be detected. The cumulative "Level of Safety" for the entire structure is the product of the discrete "Level of Safety" values for each flaw of each damage type present at each location in the structure. Based on the definition of "Level of Safety", a design procedure was identified and demonstrated on a composite sandwich panel for various damage types, with results showing the sensitivity of the structural sizing parameters to the relative safety of the design. The "Level of Safety" approach has broad potential application to damage-tolerant aircraft structural design with uncertainty.
Document ID
20000032046
Acquisition Source
Langley Research Center
Document Type
Contractor Report (CR)
Authors
Lin, K. Y. (Washington Univ. Seattle, WA United States)
Du, Jiaji (Washington Univ. Seattle, WA United States)
Rusk, David (Washington Univ. Seattle, WA United States)
Date Acquired
September 7, 2013
Publication Date
February 1, 2000
Subject Category
Structural Mechanics
Report/Patent Number
NASA/CR-2000-209847
NAS 1.26:209847
Funding Number(s)
CONTRACT_GRANT: NAG1-2055
PROJECT: RTOP 522-31-71-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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