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Validated feasibility study of integrally stiffened metallic fuselage panels for reducing manufacturing costs
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Pettit, R. G. Wang, J. J. Toh, C. |
| Copyright Year | 2000 |
| Description | The continual need to reduce airframe cost and the emergence of high speed machining and other manufacturing technologies has brought about a renewed interest in large-scale integral structures for aircraft applications. Applications have been inhibited, however, because of the need to demonstrate damage tolerance, and by cost and manufacturing risks associated with the size and complexity of the parts. The Integral Airframe Structures (IAS) Program identified a feasible integrally stiffened fuselage concept and evaluated performance and manufacturing cost compared to conventional designs. An integral skin/stiffener concept was produced both by plate hog-out and near-net extrusion. Alloys evaluated included 7050-T7451 plate, 7050-T74511 extrusion, 6013-T6511 extrusion, and 7475-T7351 plate. Mechanical properties, structural details, and joint performance were evaluated as well as repair, static compression, and two-bay crack residual strength panels. Crack turning behavior was characterized through panel tests and improved methods for predicting crack turning were developed. Manufacturing cost was evaluated using COSTRAN. A hybrid design, made from high-speed machined extruded frames that are mechanically fastened to high-speed machined plate skin/stringer panels, was identified as the most cost-effective manufacturing solution. Recurring labor and material costs of the hybrid design are up to 61 percent less than the current technology baseline. |
| File Size | 4908714 |
| File Format | |
| Language | English |
| Publisher Date | 2000-05-01 |
| Access Restriction | Open |
| Subject Keyword | Metals And Metallic Materials Airframes Tolerances Mechanics Operating Costs Cost Reduction Mechanical Properties Feasibility Fuselages Manufacturing Aircraft Structures Residual Strength Crack Propagation 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 |
