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Free vibrations of thin-walled semicircular graphite-epoxy composite frames (Document No: 19910004437)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Noor, Ahmed K. Peters, Jeanne M. Carden, Huey D. |
| Copyright Year | 1990 |
| Description | A 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 modelled 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 frames. 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 1-D 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. |
| File Size | 7727787 |
| Page Count | 44 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19910004437 |
| Archival Resource Key | ark:/13960/t73v4gm4k |
| Language | English |
| Publisher Date | 1990-11-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Frames Stress Analysis Structural Vibration Thin Walls Mechanical Properties Boundary Conditions Laminates Displacement Finite Element Method Predictions Graphite-epoxy Composites Vibration Effects Fiber Orientation Composite Structures Structural Analysis Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
