Chapter
Jul 11, 2012
Simulating the Response of a Composite Honeycomb Energy Absorber, Part 2: Full-Scale Impact Testing
Authors: E. L. Fasanella [email protected], M. S. Annett [email protected], K. E. Jackson [email protected], and M. A. Polanco [email protected]Author Affiliations
Publication: Earth and Space 2012: Engineering, Science, Construction, and Operations in Challenging Environments
Abstract
NASA has sponsored research to evaluate an externally deployable composite honeycomb designed to attenuate loads in the event of a helicopter crash. The concept, designated the Deployable Energy Absorber (DEA), is an expandable Kevlar® honeycomb. The DEA has a flexible hinge that allows the honeycomb to be stowed collapsed until needed during an emergency. Evaluation of the DEA began with material characterization of the Kevlar®-129 fabric/epoxy, and ended with a full-scale crash test of a retrofitted MD-500 helicopter. During each evaluation phase, finite element models of the test articles were developed and simulations were performed using the dynamic finite element code, LS-DYNA®. The paper will focus on simulations of two full-scale impact tests involving the DEA, a mass-simulator and a full-scale crash of an instrumented MD-500 helicopter. Isotropic (MAT24) and composite (MAT58) material models, which were assigned to DEA shell elements, were compared. Based on simulations results, the MAT58 model showed better agreement with test.
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© 2012 American Society of Civil Engineers.
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Published online: Jul 11, 2012
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National Institute of Aerospace, Mail Stop 495, NASA Langley Research Center, Hampton, VA 23681-2199. E-mail: [email protected]
NASA Langley Research Center, Mail Stop 495, 12 West Bush Road, Hampton, VA 23681-2199. E-mail: [email protected]
NASA Langley Research Center, Mail Stop 495, 12 West Bush Road, Hampton, VA 23681-2199. E-mail: [email protected]
ATK Space Systems, Inc., Mail Stop 495, NASA Langley Research Center, Hampton, VA 23681-2199. E-mail: [email protected]
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