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Finite element elastic-plastic-creep and cyclic life analysis of a cowl lipResults are presented of elastic, elastic-plastic, and elastic-plastic-creep analyses of a test-rig component of an actively cooled cowl lip. A cowl lip is part of the leading edge of an engine inlet of proposed hypersonic aircraft and is subject to severe thermal loadings and gradients during flight. Values of stresses calculated by elastic analysis are well above the yield strength of the cowl lip material. Such values are highly unrealistic, and thus elastic stress analyses are inappropriate. The inelastic (elastic-plastic and elastic-plastic-creep) analyses produce more reasonable and acceptable stress and strain distributions in the component. Finally, using the results from these analyses, predictions are made for the cyclic crack initiation life of a cowl lip. A comparison of predicted cyclic lives shows the cyclic life prediction from the elastic-plastic-creep analysis to be the lowest and, hence, most realistic.
Document ID
Document Type
Preprint (Draft being sent to journal)
Arya, Vinod K.
(Toledo Univ. OH., United States)
Melis, Matthew E.
(NASA Lewis Research Center Cleveland, OH, United States)
Halford, Gary R.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 8, 2013
Publication Date
April 1, 1990
Subject Category
Structural Mechanics
Report/Patent Number
NAS 1.15:102342
Accession Number
Funding Number(s)
PROJECT: RTOP 553-13-00
Distribution Limits
Work of the US Gov. Public Use Permitted.
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