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A Higher-Order Bending Theory for Laminated Composite and Sandwich BeamsA higher-order bending theory is derived for laminated composite and sandwich beams. This is accomplished by assuming a special form for the axial and transverse displacement expansions. An independent expansion is also assumed for the transverse normal stress. Appropriate shear correction factors based on energy considerations are used to adjust the shear stiffness. A set of transverse normal correction factors is introduced, leading to significant improvements in the transverse normal strain and stress for laminated composite and sandwich beams. A closed-form solution to the cylindrical elasticity solutions for a wide range of beam aspect ratios and commonly used material systems. Accurate shear stresses for a wide range of laminates, including the challenging unsymmetric composite and sandwich laminates, are obtained using an original corrected integration scheme. For application of the theory to a wider range of problems, guidelines for finite element approximations are presented.
Document ID
19970015285
Acquisition Source
Langley Research Center
Document Type
Contractor Report (CR)
Authors
Cook, Geoffrey M. (George Washington Univ. Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1997
Subject Category
Structural Mechanics
Report/Patent Number
NAS 1.26:201674
NASA-CR-201674
Accession Number
97N18243
Funding Number(s)
PROJECT: RTOP 537-06-21-09
CONTRACT_GRANT: NCC1-208
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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