Fracture of a Thin Laminated Foil

P. Ståhle, E. Andreasson, S. Kao-Walter

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

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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.
Original languageEnglish
Title of host publicationProcedia Materials Science
Subtitle of host publication20th European Conference on Fracture (ECF20)
PublisherElsevier
Number of pages12
Publication statusPublished - 2014
EventThe 20th European Conference on Fracture - Trondheim, Norway
Duration: 2014 Jun 302014 Jul 4
Conference number: 20
http://ecf20.no/

Conference

ConferenceThe 20th European Conference on Fracture
Abbreviated titleECF20
Country/TerritoryNorway
CityTrondheim
Period2014/06/302014/07/04
Internet address

Subject classification (UKÄ)

  • Physical Sciences
  • Mathematics

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