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Crash energy absorption of braided c...

Flesher, Nathan Daniel.

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Crash energy absorption of braided composite tubes.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Crash energy absorption of braided composite tubes./
作者:	Flesher, Nathan Daniel.
面頁冊數:	160 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 6229.
Contained By:	Dissertation Abstracts International66-11B.
標題:	Engineering, Mechanical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3197431
ISBN:	9780542431289

Crash energy absorption of braided composite tubes.
Flesher, Nathan Daniel.

Crash energy absorption of braided composite tubes. - 160 p.

Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 6229.

Thesis (Ph.D.)--Stanford University, 2006.

Composite materials, specifically braided composites, are well-suited for use in automotive systems. Composite materials can be lighter than conventional steel components and create a safer structure through increased crash energy absorption along with other advantages. Unfortunately, no tools exist to model braided composite materials in the dynamic crash regime.

ISBN: 9780542431289Subjects--Topical Terms:

783786
Engineering, Mechanical.

Crash energy absorption of braided composite tubes.
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245 1 0 $a Crash energy absorption of braided composite tubes.
300 $a 160 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 6229.
500 $a Adviser: Fu-Kuo Chang.
502 $a Thesis (Ph.D.)--Stanford University, 2006.
520 $a Composite materials, specifically braided composites, are well-suited for use in automotive systems. Composite materials can be lighter than conventional steel components and create a safer structure through increased crash energy absorption along with other advantages. Unfortunately, no tools exist to model braided composite materials in the dynamic crash regime.
520 $a The goal of the present research is to develop and implement a dynamic, efficient finite element simulation of braided composite tubes that can be incorporated into industrial finite element models. Tests are conducted to determine the influence of material, geometry, and rate effects on crash energy absorption and a material model is developed. The model is then implemented in ABAQUS/Explicit, verified, and used to investigate design concepts. Experiments conducted include unidirectional coupon tests, braided coupon tests with and without holes, and tube crush tests of square and circular tubes at rates ranging from quasi-static to 4000 mm/s.
520 $a When crushed on a plug initiator, tubes typically reach a peak load value and then crush at a constant, steady-state value. In circular tubes, specific energy absorption (SEA) increases with braid angle at a given rate. Due to the presence of stress concentrating corners, square tube SEA does not depend on braid angle. In all tubes, SEA decreases at dynamic rates compared to quasi-static rate.
520 $a The change in SEA with crush rate is attributed to rate dependence in the matrix phase of the composite, leading to the selection of a viscoplastic constitutive law to model the composite behavior. This constitutive law is combined with a homogenized unit cell model and consideration for stress concentration and braider tow rotation to create a material model.
520 $a Model outputs agree well with experimental results, leading to the conclusion that the present material model can be used to simulate crash energy absorption in braided composite materials. Use of the model for design purposes reveals that an increase in matrix strength would increase tube SEA, but an increase in fiber strength would be of limited utility. Tube geometric changes such as the addition of corners to make a hexagonal tube would be useful in areas where flat surfaces are necessary.
590 $a School code: 0212.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Engineering, Automotive. $3 1018477
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790 $a 0212
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3197431