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Design and manufacture of elastically tailored tow placed plates
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Guerdal, Zafer Tatting, Brain F. |
| Copyright Year | 2002 |
| Description | Elastic stiffness tailoring of laminated composite panels by allowing the fibers to curve within the plane of the laminate is a relatively novel design concept that has been demonstrated to be both beneficial and practical. In particular, for structures with highly non-uniform stress states, such as the case of a flat panel with a central hole subjected to in-plane loading, the concept is likely to provide substantial improvements in load carrying capability. The objective of the present study is to determine the effectiveness of stiffness tailoring through the use of curvilinear fibers to reduce stress concentrations around the hole and improve the load carrying capability of panels with holes. In this study software was created that translates standard finite element models with traditional laminate definitions into ones that possess stacking sequences with curvilinear fiber paths that are directly manufacturable using an advanced tow placement machine. Preliminary designs for the manufacturing and testing phase were determined through rudimentary design studies for flat plates without holes under axial compression. These candidate designs were then analyzed using finite element models that accurately reflect the test conditions and geometries in order to select final designs for testing. A total of six large panels, measuring three feet by six feet, each of which are used to produce four specimens with or without holes, were fabricated and delivered to NASA for machining and testing. |
| File Size | 4285647 |
| Page Count | 34 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20020073162 |
| Archival Resource Key | ark:/13960/t2j72d85f |
| Language | English |
| Publisher Date | 2002-08-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Stress Concentration Panels Flat Plates Machining Compression Loads Fiber Composites Stacking Sequence Composite Materials Laminates Nonuniformity Load Distribution Forces Holes Mechanics Finite Element Method Fabrication Graphite-epoxy Composites Fiber Orientation Stiffness Elastic Properties Manufacturing 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 |
