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Experimental and analytical evaluation of a composite honeycomb deployable energy absorber
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Annett, Martin S. Polanco, Michael A. Fasanella, Edwin L. Jackson, Karen E. Kellas Sr., Sotiris Horta, Lucas G. Littell, Justin D. |
| Copyright Year | 2011 |
| Description | In 2006, the NASA Subsonic Rotary Wing Aeronautics Program sponsored the experimental and analytical evaluation of an externally deployable composite honeycomb structure that is designed to attenuate impact energy during helicopter crashes. The concept, which is designated the Deployable Energy Absorber (DEA), utilizes an expandable Kevlar honeycomb structure to dissipate kinetic energy through crushing. The DEA incorporates a unique flexible hinge design that allows the honeycomb to be packaged and stowed flat until needed for deployment. A variety of deployment options such as linear, radial, and/or hybrid methods can be used. Experimental evaluation of the DEA utilized a building block approach that included material characterization testing of its constituent, Kevlar -129 fabric/epoxy, and flexural testing of single hexagonal cells. In addition, the energy attenuation capabilities of the DEA were demonstrated through multi-cell component dynamic crush tests, and vertical drop tests of a composite fuselage section, retrofitted with DEA blocks, onto concrete, water, and soft soil. During each stage of the DEA evaluation process, finite element models of the test articles were developed and simulations were performed using the explicit, nonlinear transient dynamic finite element code, LS-DYNA. This report documents the results of the experimental evaluation that was conducted to assess the energy absorption capabilities of the DEA. |
| File Size | 5558648 |
| Page Count | 94 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20110023003 |
| Archival Resource Key | ark:/13960/t16m87j3p |
| Language | English |
| Publisher Date | 2011-11-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Subsonic Speed Expandable Structures Displacement Rotary Wings Stress-strain Diagrams Finite Element Method Absorbers Materials Aircraft Accidents Drop Tests Fuselages Honeycomb Structures Composite Structures Acceleration Kinetic Energy Energy Absorption Crashworthiness 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 |
