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Postbuckling of laminated anisotropic panelsA two-part study of the buckling and postbuckling of laminated anisotropic plates with bending-extensional coupling is presented. The first part involves the development and application of a modified Rayleigh-Ritz analysis technique. Modifications made to the classical technique can be grouped into three areas. First, known symmetries of anisotropic panels are exploited in the selection of approximation functions. Second, a reduced basis technique based on these same symmetries is applied in the linear range. Finally, geometric boundary conditions are enforced via an exterior penalty function approach, rather than relying on choice of approximation functions to satisfy these boundary conditions. Numerical results are presented for both the linear and nonlinear range, with additional studies made to determine the effect of variation in penalty parameter and number of basis vectors. In the second part, six panels possessing anisotropy and bending-extensional coupling are tested. Detailed comparisons are made between experiment and finite element results in order to gain insight into the postbuckling and failure characteristics of such panels. The panels are constructed using two different lamination sequences, and panels with three different aspect ratios were constructed for each lamination sequence.
Document ID
19880006629
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Jeffrey, Glenda L. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 5, 2013
Publication Date
October 1, 1987
Subject Category
Structural Mechanics
Report/Patent Number
NAS 1.15:100509
NASA-TM-100509
Accession Number
88N16011
Funding Number(s)
PROJECT: RTOP 585-01-21-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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