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Thermal elastoplastic structural analysis of non-metallic thermal protection systemsAn incremental theory and numerical procedure to analyze a three-dimensional thermoelastoplastic structure subjected to high temperature, surface heat flux, and volume heat supply as well as mechanical loadings are presented. Heat conduction equations and equilibrium equations are derived by assuming a specific form of incremental free energy, entropy, stresses and heat flux together with the first and second laws of thermodynamics, von Mises yield criteria and Prandtl-Reuss flow rule. The finite element discretization using the linear isotropic three-dimensional element for the space domain and a difference operator corresponding to a linear variation of temperature within a small time increment for the time domain lead to systematic solutions of temperature distribution and displacement and stress fields. Various boundary conditions such as insulated surfaces and convection through uninsulated surface can be easily treated. To demonstrate effectiveness of the present formulation a number of example problems are presented.
Document ID
19730007221
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Chung, T. J. (Alabama Univ. Huntsville, AL, United States)
Yagawa, G. (Alabama Univ. Huntsville, AL, United States)
Date Acquired
September 2, 2013
Publication Date
August 1, 1972
Subject Category
Thermodynamics And Combustion
Report/Patent Number
UARI-126
NASA-CR-124005
Accession Number
73N15948
Funding Number(s)
CONTRACT_GRANT: NAS8-27792
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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