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Modelling of Damage and Crack Growth in Semi-crystalline Polymers
Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
Tetra Pak.
Malmo University.
2018 (English)In: Presented at International Conference on Plasticity, Damage and Fracture 2018, Puerto Rico, Neat press , 2018Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Crack growth in semi-crystalline polymers, represented by polyethylene, is considered. The material considered comes in plates that had been created through an injection-molding process. Hence, the material was taken to be orthotropic. Material direction were identified as MD: molding direction, CD: transverse direction, TD: thickness direction. Uniaxial tensile testing was performed in order to establish the direction-specific elastic-plastic behaviour of the polymer. In addition, the fracture mechanics properties of the material was determined by performing fracture mechanics testing on plates with side cracks of different lengths. The fracture mechanics tests were filmed using a video camera. Based on this information, the force vs. load-line displacement could be established for the fracture mechanics tests, in which also the current length of the crack was indicated, since crack growth took place. In parallel to the experimental testing, an anisotropic plasticity model for finite strains was developed, which accounts for orthotropic elasticity and orthotropic plastic yielding and hardening. That plasticity model was implemented as a user subrouting in Abaqus. The crack growth experiments were then simulated using Abaqus, using the implemented plasticity model in combination with a damage model. Different types of crack initiation and growth criteria were explored, and the force-displacement-crack length data from the experiments could be well reproduced. Furthermore, the direction-specific work of fracture had been established from the experiments and these energies could be compared to the values of the J-integral from the simulations for the different crack lengths.

Place, publisher, year, edition, pages
Neat press , 2018.
National Category
Polymer Technologies
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
URN: urn:nbn:se:lnu:diva-72218ISBN: 978-0-9911654-5-2 OAI: oai:DiVA.org:lnu-72218DiVA, id: diva2:1195142
Conference
ICPDF, International Conference on Plasticity, Damage and Fracture 3-9 January, 2018, Puerto Rico
Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-04-05Bibliographically approved

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Kroon, Martin

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf