File:Analytical crashworthiness methods applied to composite structures (IA analyticalcrashw00lehn).pdf

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Analytical crashworthiness methods applied to composite structures   (Wikidata search (Cirrus search) Wikidata query (SPARQL)  Create new Wikidata item based on this file)
Author
Lehnhardt, Keith W.
image of artwork listed in title parameter on this page
Title
Analytical crashworthiness methods applied to composite structures
Publisher
Springfield, Virginia: Available from National Technical Information Service
Description
"June 1999"
Thesis (Degree in Naval Engineer and M.S. in Materials Science and Engineering) Massaschusetts Institute of Technology, June 1999
Includes bibliographical references (leaves 57-58)
Several shell deformation models are developed for use in crashworthiness analysis of rotationally symmetric structures. These models use analytical techniques to predict the crushing force versus axial crush distance characteristics of both a rigid-plastic, hemispherical shell and an elastic, cylindrical shell loaded axially by a rigid flat plate. Additional methods are proposed to determine the effects of cutout sections and internal stiffening members on the crushing force capacity of the shells. These proposed methods are applied to determine the energy absorption capability of the composite/metal nose structure of a mini submarine subjected to a head-on impact with a flat rigid wall. The nose structure is composed of a stiffened composite shell that covers and is attached to the metal, forward, hemispherical portion of the pressure hull. The complex structure is simplified to a rotationally symmetric shell model and modified to account for the effects of stiffening elements and cutout sections. Laminated plate theory, a progressive composite failure method, and the models developed are then used to determine the structure's energy absorption capacity. The fairing structure is determined to be capable of absorbing the kinetic energy associated with an impact from an initial vehicle speed of 7.5 knots. Further, the entire nose structure (the fairing and forward pressure hull) is predicted to be able to absorb the kinetic energy from a 26.4 knot vehicle impact
Mode of access: World Wide Web
System requirements: Adobe Acrobat reader
dk/dk cc:9116 02/09/00

Subjects:
Language en_US
Publication date 1 June 1999
publication_date QS:P577,+1999-06-01T00:00:00Z/11
Current location
IA Collections: navalpostgraduateschoollibrary; fedlink; americana
Accession number
analyticalcrashw00lehn
Authority file  OCLC: 1039531305
Source
Internet Archive identifier: analyticalcrashw00lehn
https://archive.org/download/analyticalcrashw00lehn/analyticalcrashw00lehn.pdf

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Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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