NDLI: Thermal stress analysis of symmetric shells subjected to asymmetric thermal loads

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Thermal stress analysis of symmetric shells subjected to asymmetric thermal loads

Content Provider	NASA Technical Reports Server (NTRS)
Author	Negaard, G. R.
Copyright Year	1980
Description	The performance of the NASTRAN level 16.0 axisymmetric solid elements when subjected to both symmetric and asymmetric thermal loading was investigated. A ceramic radome was modeled using both the CTRAPRG and the CTRAPAX elements. The thermal loading applied contained severe gradients through the thickness of the shell. Both elements were found to be more sensitive to the effect of the thermal gradient than to the aspect ratio of the elements. Analysis using the CTRAPAX element predicted much higher thermal stresses than the analysis using the CTRAPRG element, prompting studies of models for which theoretical solutions could be calculated. It was found that the CTRAPRG element solutions were satisfactory, but that the CTRAPAX element was very geometry dependent. This element produced erroneous results if the geometry was allowed to vary from a rectangular cross-section. The most satisfactory solution found for this type of problem was to model a small segment of a symmetric structure with isoparametric solid elements and apply the cyclic symmetry option in NASTRAN.
File Size	546472
Page Count	23
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19800016159
Archival Resource Key	ark:/13960/t3fz2375v
Language	English
Publisher Date	1980-05-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Stress Analysis Error Analysis Asymmetry Mathematical Models Shells Structural Forms Radomes Ceramics Nastran Performance Thermal Stresses Symmetry Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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