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Crashworthiness analysis of ultralight metal structures

IP.com Disclosure Number: IPCOM000128105D
Original Publication Date: 1999-Dec-31
Included in the Prior Art Database: 2005-Sep-14
Document File: 12 page(s) / 31K

Publishing Venue

Software Patent Institute

Related People

Santosa, Sigit P: AUTHOR [+3]

Related Documents

http://theses.mit.edu:80/Dienst/UI/2.0/Describe/0018.mit.theses/1999-35: URL

Abstract

In the design of light weight crashworthy metal structures, thinwalled prismatic components have been widely used in aircraft, high speed trains, fast ships, and automobiles. Two new types of such components are proposed, both of which consist of a thin-walled member and an ultralight metal core such as an aluminum honeycomb or a closed-cell aluminum foam. The first type is the thin-walled member filled with the ultralight metal core, while the second type is a double-walled member with the ultralight metal core sandwiched between the two walls. This research is to study the crushing behavior of the ultralight metal core and to determine the crashworthiness and the weight saving of structures composed of the two types of reinforced components, each of which may undergo axial crushing, bending, or twisting. Numerical expressions are developed to predict the crushing behavior of the new type components.

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 This record is the front matter from a document that appears on a server at MIT and is used through permission from MIT. See http://theses.mit.edu:80/Dienst/UI/2.0/Describe/0018.mit.theses/1999-35 for copyright details and for the full document in image form.

Crashworthiness Analysis of Ultralight Metal Structures

by

Sigit P. Santosa
Ir.(Inginieur), in Mechanical Engineering (1991) Bandung Institute of Technology (Indonesia) SM., in Mechanical Engineering (1997) Massachusetts Institute of Technology Submitted in partial fulfillment of the requirements for the degree of Doctor of Science in Mechanical Engineering

at the Massachusetts Institute of Technology

June 1999
SIGNATURE OF author: [[signature omitted]]

Department of Mechanical Engineering

May 24, 1999
CERTIFIED BY: [[SIGNATURE OMITTED]]
T. Wierzbicki

Professor of Applied Mechanics Thesis Supervisor Prof. Ain A. Sonin
Chairman, Mechanical Engineering Graduate Committee ACCEPTED BY: [[SIGNATURE OMITTED]]
L. Anand

Professor of Mechanical Engineering Doctoral Committee Chairman ARCHIVES MASSACHUSETTS INSTITUTE OF TECHNOLOGY LIBRARIES JUL 12 1999

Massachusetts Institute of Technology Page 1 Dec 31, 1999

Page 2 of 12

Crashworthiness analysis of ultralight metal structures

Crashworthiness Analysis of Ultralight Metal Structures

by Sigit P. Santosa

Submitted to the Department of Mechanical Engineering on May 24, 1999 , in partial fulfillment of the requirements for the degree of Doctor of Science in Mechanical Engineering

Abstract

In the design of light weight crashworthy metal structures, thinwalled prismatic components have been widely used in aircraft, high speed trains, fast ships, and automobiles. Two new types of such components are proposed, both of which consist of a thin-walled member and an ultralight metal core such as an aluminum honeycomb or a closed-cell aluminum foam. The first type is the thin-walled member filled with the ultralight metal core, while the second type is a double-walled member with the ultralight metal core sandwiched between the two walls. This research is to study the crushing behavior of the ultralight metal core and to determine the crashworthiness and the weight saving of structures composed of the two types of reinforced components, each of which may undergo axial crushing, bending, or twisting. Numerical expressions are developed to predict the crushing behavior of the new type components.

The first task of the research is to study the crushing behavior of closed-cell aluminum foams. A new model of a truncated cube, which captures the basic folding mechanism of an array of cells, is developed. The model consists of a system of collapsing cruciform and pyramidal sections. Theoretical analysis is based on energy consideration in conjunction with the minimum postulate in plasticity. The assumed kinematic model for the crushing mechanism of truncated cube cells gives a good agreement with the deformation mechanism obtained from the numerical simul...