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New Layerwise Theories and Finite Elements for Efficient Thermal Analysis of Hybrid Structures

Noack, J. and Rolfes, R. and Teßmer, J. (2003) New Layerwise Theories and Finite Elements for Efficient Thermal Analysis of Hybrid Structures. Computers and Structures, 81, pp. 2525-2538.

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Abstract

Hybrid structures, for example metallic multiwall thermal protection systems, sandwiches or hot structures, consist of layers with different thermal conductivity. In addition, radiation and convection can occur within these layers. Analysis of these internal heat transfer mechanisms and the design of hybrid structures require three-dimensional models leading to a high modelling effort. With an new layerwise theory for heat conduction of hybrid structures this effort can be drastically reduced. Hybrid structures are idealized as structures with homogeneous layers characterised by different thermal conductivities. For layers with internal radiation exchange and convection an equivalent thermal conductivity is assumed. By means of two heat transfer equilibrium conditions the nodal degrees of freedom become independent of the number of layers. Two four-noded finite shell elements QUADLLT and QUADQLT based on the new theory have been developed. These 2D finite elements enable the calculation of three-dimensional temperature distributions within hybrid structures. Comparison with 3D analysis and test results shows good agreement.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2004,
Title:New Layerwise Theories and Finite Elements for Efficient Thermal Analysis of Hybrid Structures
Authors:
AuthorsInstitution or Email of Authors
Noack, J.UNSPECIFIED
Rolfes, R.UNSPECIFIED
Teßmer, J.UNSPECIFIED
Date:2003
Journal or Publication Title:Computers and Structures
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:81
Page Range:pp. 2525-2538
Status:Published
Keywords:Thermal analysis; Finite elements; Hybrid structures; Composites
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:Space
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):UNSPECIFIED
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Institut für Strukturmechanik
Deposited By: Sibylle Wolff
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 16:34

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