Publication detail
On the applicability of simple shapes of delaminations in buckling analyses
OBDRŽÁLEK, V. VRBKA, J.
Czech title
O použitelnosti jednoduchých tvarů delaminací při analýze boulení delaminovaných konstrukcí
English title
On the applicability of simple shapes of delaminations in buckling analyses
Type
journal article in Web of Science
Language
en
Original abstract
The possibility to accurately analyse the buckling behaviour of delaminated plates utilising simplified circular or elliptic representations of delaminations with irregular shapes was investigated. The smallest enclosing circle and smallest enclosing ellipse algorithms were used to obtain the simplified representations of impact induced delaminations. Finite element postbuckling simulations of compressed plates were than performed and the responses of the plates with irregular delaminations and corresponding circular and elliptic delaminations were compared in terms of buckling loads and maximum energy release rate values found along the delamination boundaries. It was found, that utilisation of the circular representation of the true shape of delaminations could lead to highly inaccurate results and therefore elliptic representation should be used instead. However, for an accurate analyses of buckling and postbuckling behaviour of delaminated structures it seems to be inevitable to use as precise representation of the shape of delaminations as possible.
Czech abstract
Příspěvek se zabývá využitelností kruhové či eliptické náhrady nepravidelného tvaru delaminací při analýze boulení stlačovaných delaminovaných desek. Zjednodušené reprezentace nepravidelných tvarů delaminací vznikajích při rázovém zatížení byly získány pomocí algoritmů pro nalezení minimálního opsaného kruhového a eliptického obrazce. Boulení delaminovaných desek s původními i zjdenodušenými tvary delaminací pak bylo analyzováno pomocí metody konečných prvků. Ze srovnávání zatížení při prvotní ztrátě stability a rozložení hnací síly trhliny po obvodě delaminací vyplynulo, že náhrada reálného tvaru delaminace kruhem nelze doporučit. Ani použití podstatně vhodnější eliptická náhrady však nemusí vést k dostatečně přesné předpovědi chování desky s delaminací nepravidelného tvaru.
English abstract
The possibility to accurately analyse the buckling behaviour of delaminated plates utilising simplified circular or elliptic representations of delaminations with irregular shapes was investigated. The smallest enclosing circle and smallest enclosing ellipse algorithms were used to obtain the simplified representations of impact induced delaminations. Finite element postbuckling simulations of compressed plates were than performed and the responses of the plates with irregular delaminations and corresponding circular and elliptic delaminations were compared in terms of buckling loads and maximum energy release rate values found along the delamination boundaries. It was found, that utilisation of the circular representation of the true shape of delaminations could lead to highly inaccurate results and therefore elliptic representation should be used instead. However, for an accurate analyses of buckling and postbuckling behaviour of delaminated structures it seems to be inevitable to use as precise representation of the shape of delaminations as possible.
Keywords in Czech
laminát kov-kompozit, ztráta stability, metoda konečných prvků, delaminace, desky
Keywords in English
Fibre-metal laminate, plates, buckling, delaminations, finite element analysis
RIV year
2011
Released
04.04.2011
Publisher
Elsevier Ltd.
Location
Oxford
ISSN
1359-8368
Journal
COMPOSITES PART B-ENGINEERING
Volume
42
Number
3
Pages from–to
538–545
Pages count
8
BIBTEX
@article{BUT48611,
author="Vít {Obdržálek} and Jan {Vrbka},
title="On the applicability of simple shapes of delaminations in buckling analyses",
journal="COMPOSITES PART B-ENGINEERING",
year="2011",
volume="42",
number="3",
month="April",
pages="538--545",
publisher="Elsevier Ltd.",
address="Oxford",
issn="1359-8368"
}