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Free vibrations of thin-walled semicircular graphite-epoxy composite framesA detailed study is made of the effects of variations in lamination and material parameters of thin walled composite frames on their vibrational characteristics. The structures considered are semicircular thin walled frames with I and J sections. The flanges and webs of the frames are modeled by using 2-D shell and plate finite elements. A mixed formulation is used with the fundamental unknowns consisting of both the generalized displacements and stress resultants in the frame. The frequencies and modes predicted by the 2-D finite element model are compared with those obtained from experiments, as well as with the predictions of a non-dimensional thin walled beam finite element model. A detailed study is made of the sensitivity of the vibrational response to variations in the fiber orientation, material properties of the individual layers, and boundary conditions.
Document ID
19900016049
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Carden, Huey D. (NASA Langley Research Center Hampton, VA., United States)
Noor, Ahmed K. (George Washington Univ. Hampton, VA., United States)
Peters, Jeanne M. (George Washington Univ. Hampton, VA., United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1990
Subject Category
Structural Mechanics
Report/Patent Number
NASA-TM-102680
NAS 1.15:102680
Accession Number
90N25365
Funding Number(s)
PROJECT: RTOP 505-63-01-11
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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