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Analysis and Development of Finite Element Methods for the Study of Nonlinear Thermomechanical Behavior of Structural ComponentsUnderintegrated methods are investigated with respect to their stability and convergence properties. The focus was on identifying regions where they work and regions where techniques such as hourglass viscosity and hourglass control can be used. Results obtained show that underintegrated methods typically lead to finite element stiffness with spurious modes in the solution. However, problems exist (scalar elliptic boundary value problems) where underintegrated with hourglass control yield convergent solutions. Also, stress averaging in underintegrated stiffness calculations does not necessarily lead to stable or convergent stress states.
Document ID
19950019967
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Oden, J. Tinsley (Texas Univ. Austin, TX, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1995
Publication Information
Publisher: NASA
Subject Category
Structural Mechanics
Report/Patent Number
E-9005
NASA-CR-195354
NAS 1.26:195354
Accession Number
95N26387
Funding Number(s)
CONTRACT_GRANT: NAG3-329
PROJECT: RTOP 505-63-5B
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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