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Finite-element thermo-viscoplastic analysis of aerospace structuresThe time-dependent thermo-viscoplastic response of aerospace structures subjected to intense aerothermal loads is predicted using the finite-element method. The finite-element analysis uses the Bodner-Partom unified viscoplastic constitutive relations to determine rate-dependent nonlinear material behavior. The methodology is verified by comparison with experimental data and other numerical results for a uniaxially-loaded bar. The method is then used (1) to predict the structural response of a rectangular plate subjected to line heating along a centerline, and (2) to predict the thermal-structural response of a convectively-cooled engine cowl leading edge subjected to aerodynamic shock-shock interference heating. Compared to linear elastic analysis, the viscoplastic analysis results in lower peak stresses and regions of plastic deformations.
Document ID
19910031411
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Pandey, Ajay
(Lockheed Engineering and Sciences Co. Hampton, VA, United States)
Dechaumphai, Pramote
(NASA Langley Research Center Hampton, VA, United States)
Thornton, Earl A.
(Virginia, University Charlottesville, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1990
Subject Category
Structural Mechanics
Accession Number
91A16034
Distribution Limits
Public
Copyright
Other

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