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Fracture of a Thin Laminated Foil

Ståhle, P. LU ; Andreasson, E. and Kao-Walter, S. (2014) The 20th European Conference on Fracture
Abstract
The micro-mechanisms of fracture in a laminate composed of an aluminium foil and a polyethene film are considered. Thelaminate as well as the freestanding layers were fracture mechanically tested. Inspection of the broken cross-sections shows thatfracture occurs through necking, i.e., localised plastic deformation leading to a decreasing and eventually vanishing cross-section.This occurs ahead of the crack tip for both freestanding layers and the laminate. The plastic properties and a slip-line theory aresuccessfully used to derive the work of failure. An accurate prediction of the fracture toughness is made for the aluminium foil andthe laminate. Even though the toughness of the freestanding polyethene film could not... (More)
The micro-mechanisms of fracture in a laminate composed of an aluminium foil and a polyethene film are considered. Thelaminate as well as the freestanding layers were fracture mechanically tested. Inspection of the broken cross-sections shows thatfracture occurs through necking, i.e., localised plastic deformation leading to a decreasing and eventually vanishing cross-section.This occurs ahead of the crack tip for both freestanding layers and the laminate. The plastic properties and a slip-line theory aresuccessfully used to derive the work of failure. An accurate prediction of the fracture toughness is made for the aluminium foil andthe laminate. Even though the toughness of the freestanding polyethene film could not be accurately determined by the theory, itsrole as a member of the laminate is predicted by the theory with great accuracy. It is shown that the load carrying capacity of thelaminate is many times larger than the added load carried by the freestanding layers. The study further indicates that necking maybe impeded which may increase the toughness several times. It is also shown how the laminate may be forced to produce multiplenecking with a significantly improved toughness as a result. (Less)
Abstract (Swedish)
The micro-mechanisms of fracture in a laminate composed of an aluminium foil and a polyethene film are considered. The laminate as well as the freestanding layers were fracture mechanically tested. Inspection of the broken cross-sections shows that fracture occurs through necking, i.e., localised plastic deformation leading to a decreasing and eventually vanishing cross-section. This occurs ahead of the crack tip for both freestanding layers and the laminate. The plastic properties and a slip-line theory are successfully used to derive the work of failure. An accurate prediction of the fracture toughness is made for the aluminium foil and the laminate. Even though the toughness of the freestanding polyethene film could not be accurately... (More)
The micro-mechanisms of fracture in a laminate composed of an aluminium foil and a polyethene film are considered. The laminate as well as the freestanding layers were fracture mechanically tested. Inspection of the broken cross-sections shows that fracture occurs through necking, i.e., localised plastic deformation leading to a decreasing and eventually vanishing cross-section. This occurs ahead of the crack tip for both freestanding layers and the laminate. The plastic properties and a slip-line theory are successfully used to derive the work of failure. An accurate prediction of the fracture toughness is made for the aluminium foil and the laminate. Even though the toughness of the freestanding polyethene film could not be accurately determined by the theory, its role as a member of the laminate is predicted by the theory with great accuracy. It is shown that the load carrying capacity of the laminate is many times larger than the added load carried by the freestanding layers. The study further indicates that necking may be impeded which may increase the toughness several times. It is also shown how the laminate may be forced to produce multiple necking with a significantly improved toughness as a result. (Less)
Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
Procedia Materials Science : 20th European Conference on Fracture (ECF20) - 20th European Conference on Fracture (ECF20)
pages
12 pages
publisher
Elsevier
conference name
The 20th European Conference on Fracture
conference location
Trondheim, Norway
conference dates
2014-06-30 - 2014-07-04
language
English
LU publication?
yes
additional info
M1 - 20
id
de9b64ae-262c-4865-8aeb-1c0ba4f95655
date added to LUP
2019-06-17 16:24:11
date last changed
2019-12-11 09:36:58
@inproceedings{de9b64ae-262c-4865-8aeb-1c0ba4f95655,
  abstract     = {The  micro-mechanisms  of  fracture  in  a  laminate  composed  of  an  aluminium  foil  and  a  polyethene  film  are  considered.   Thelaminate as well as the freestanding layers were fracture mechanically tested.  Inspection of the broken cross-sections shows thatfracture occurs through necking, i.e., localised plastic deformation leading to a decreasing and eventually vanishing cross-section.This occurs ahead of the crack tip for both freestanding layers and the laminate.  The plastic properties and a slip-line theory aresuccessfully used to derive the work of failure. An accurate prediction of the fracture toughness is made for the aluminium foil andthe laminate. Even though the toughness of the freestanding polyethene film could not be accurately determined by the theory, itsrole as a member of the laminate is predicted by the theory with great accuracy.  It is shown that the load carrying capacity of thelaminate is many times larger than the added load carried by the freestanding layers. The study further indicates that necking maybe impeded which may increase the toughness several times. It is also shown how the laminate may be forced to produce multiplenecking with a significantly improved toughness as a result.},
  author       = {Ståhle, P. and Andreasson, E. and Kao-Walter, S.},
  booktitle    = {Procedia Materials Science : 20th European Conference on Fracture (ECF20)},
  language     = {eng},
  publisher    = {Elsevier},
  title        = {Fracture of a Thin Laminated Foil},
  url          = {https://lup.lub.lu.se/search/files/67249876/Manus_ECF20v2.pdf},
  year         = {2014},
}