Micro-mechanism of Thin and Laminated Packaging Material during Fracture

Document type: Conference Papers
Peer reviewed: Yes
Full text:
Author(s): Sharon Kao-Walter, Eskil Andreasson, Per Ståhle
Title: Micro-mechanism of Thin and Laminated Packaging Material during Fracture
Conference name: 8th Meeting of TC2 on Micromechanisms of the European Structural Integrity Society (ESIS TC2))
Year: 2012
Publisher: Mansfield College, Oxford
City: Oxford
Other identifiers: http://energy.materials.ox.ac.uk/uploads/ESIS%20TC2%20Workshop%202012/ESIS%20TC2%20Extended%20Abstracts.pdf
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Mechanical Engineering (Sektionen för ingenjörsvetenskap - avd. för maskinteknik)
School of Engineering S- 371 79 Karlskrona, School of Engineering S- 371 79 Karlskrona
+46 455 38 50 00
Authors e-mail: skw@bth.se
Language: English
Abstract: Fracture path of a polymer coated and uncoated aluminium foil (about 6-7 um) is followed in a Scanning Electron Microscope. The crack length and applied load were measured during crack initiation and growth. The specimens’ cross section were then studied using the optical profilometric method to exam the deformed surface. For the uncoated Al-foil, no fracture surface can be observed. Fracture seems to occur through so-called necking. This behaviour was successfully modelled by a modified strip yield model. It leads to a conclusion that the crack tip is preceded a substantial plastic zone as compared with the crack length. The result was then compared to a polymer coated Al-foil. Further more, similar experimental works were performed on a polymer coated and uncoated Polypropylene. The results were discussed and compared to the cases with Al-foil layer.
Subject: Mechanical Engineering\General
Mechanical Engineering\Structural Mechanics
Keywords: Fracture path, aluminum foil, packaging, laminate, modified strip yield model.