Importance of Instability in Impact Response and Damage Resistance of Composite Shells
| Autor: | Brian L. Wardle, Paul A. Lagace |
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| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | AIAA Journal. 35:389-396 |
| ISSN: | 1533-385X 0001-1452 |
| DOI: | 10.2514/2.106 |
| Popis: | The response of laminated cylindrical composite shell structures to transverse loading was studied through impact and quasi-static testing. A highly nonlinear structural instability phenomenon, closely resembling a snap-through instability, was found to have a strong influence on the loading/impact response including the resulting damage. Because of this structural instability, the behavior of convex shells under static or dynamic (i.e., impact) transverse loading is found to be much different than that for plates. These differences include trends displayed in the response parameters as well as damage extent and distribution. Convex shells with a response instability are found to have increased impact damage resistance compared with plates. A concept is proposed wherein the instability provides a mechanism, not available in plates, by which shell structures dissipate impact energy through structural deformation and thus exhibit improved impact damage resistance. Conversely, convex shells with no response instability have decreased impact damage resistance compared with plates. The differences in composite shell and plate behavior, particularly damage resistance, have important ramifications to the design of damage tolerant aerospace components and are discussed. |
| Databáze: | OpenAIRE |
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