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Elevated temperature crack growthA study was performed to examine the applicability of path-independent (P-I) integrals to crack growth problems in hot section components of gas turbine aircraft engines. Alloy 718 was used and the experimental parameters included combined temperature and strain cycling, thermal gradients, elastic-plastic strain levels, and mean strains. A literature review was conducted of proposed P-I integrals, and those capable of analyzing hot section component problems were selected and programmed into the postprocessor of a finite element code. Detailed elastic-plastic finite element analyses were conducted to simulate crack growth and crack closure of the test specimen, and to evaluate the P-I integrals. It was shown that the selected P-I integrals are very effective for predicting crack growth for isothermal conditions.
Document ID
19900017039
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Kim, K. S. (General Electric Co. Cincinnati, OH, United States)
Vanstone, R. H. (General Electric Co. Cincinnati, OH, United States)
Malik, S. N. (General Electric Co. Cincinnati, OH, United States)
Laflen, J. H. (General Electric Co. Cincinnati, OH, United States)
Date Acquired
September 6, 2013
Publication Date
November 1, 1988
Subject Category
Structural Mechanics
Report/Patent Number
R89AEB-325
AD-B149073L
NASA-CR-182247
NAS 1.26:182247
Accession Number
90N26355
Funding Number(s)
CONTRACT_GRANT: NAS3-23940
PROJECT: RTOP 505-43-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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