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Mitigation of Crack Damage in Metallic MaterialsA system designed to mitigate or heal crack damage in metallic materials has been developed where the protected material or component is coated with a low-melting temperature film. After a crack is formed, the material is heated, melting the film which then infiltrates the crack opening through capillary action. Upon solidification, the healing material inhibits further crack damage in two ways. While the crack healing material is intact, it acts like an adhesive that bonds or bridges the crack faces together. After fatigue loading damages, the healing material in the crack mouth inhibits further crack growth by creating artificially-high crack closure levels. Mechanical test data show that this method sucessfully arrests or retards crack growth in laboratory specimens.
Document ID
20140006911
Document Type
Technical Memorandum (TM)
Authors
Leser, Patrick E.
(North Carolina State Univ. Raleigh, NC, United States)
Newman, John A.
(NASA Langley Research Center Hampton, VA, United States)
Smith, Stephen W.
(NASA Langley Research Center Hampton, VA, United States)
Leser, William P.
(NASA Langley Research Center Hampton, VA, United States)
Wincheski, Russell A.
(NASA Langley Research Center Hampton, VA, United States)
Wallace, Terryl A.
(NASA Langley Research Center Hampton, VA, United States)
Glaessgen, Edward H.
(NASA Langley Research Center Hampton, VA, United States)
Piascik, Robert S.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
June 9, 2014
Publication Date
May 1, 2014
Subject Category
Metals And Metallic Materials
Report/Patent Number
NF1676L-18936
NASA/TM-2014-218272
L-20418
Funding Number(s)
WBS: WBS 432938.11.01.07.43.98.09
Distribution Limits
Public
Copyright
Public Use Permitted.
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