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Strain-Based Damage Determination Using Finite Element Analysis for Structural Health ManagementA damage determination method is presented that relies on in-service strain sensor measurements. The method employs a gradient-based optimization procedure combined with the finite element method for solution to the forward problem. It is demonstrated that strains, measured at a limited number of sensors, can be used to accurately determine the location, size, and orientation of damage. Numerical examples are presented to demonstrate the general procedure. This work is motivated by the need to provide structural health management systems with a real-time damage characterization. The damage cases investigated herein are characteristic of point-source damage, which can attain critical size during flight. The procedure described can be used to provide prognosis tools with the current damage configuration.
Document ID
20160006299
Acquisition Source
Langley Research Center
Document Type
Technical Publication (TP)
Authors
Hochhalter, Jacob D. (NASA Langley Research Center Hampton, VA, United States)
Krishnamurthy, Thiagaraja (NASA Langley Research Center Hampton, VA, United States)
Aguilo, Miguel A. (Sandia Labs. Albuquerque, NM, United States)
Date Acquired
May 17, 2016
Publication Date
April 1, 2016
Subject Category
Air Transportation And Safety
Structural Mechanics
Report/Patent Number
NASA/TP-2016-219186
L-20689
NF1676L-24043
Funding Number(s)
CONTRACT_GRANT: DE-AC04-94AL85000
WBS: WBS 533127.02.16.07.06
Distribution Limits
Public
Copyright
Public Use Permitted.

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