Change search
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
Anisotropic Elastic-Viscoplastic Properties at Finite Strains of Injection-Moulded Low-Density Polyethylene
Linnaeus University, SWE.
Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
Tetra Pak AB, SWE.
Tetra Pak AB, SWE.
Show others and affiliations
2018 (English)In: Experimental mechanics, ISSN 0014-4851, E-ISSN 1741-2765, Vol. 58, no 1, p. 75-86Article in journal (Refereed) Published
Abstract [en]

Injection-moulding is one of the most common manufacturing processes used for polymers. In many applications, the mechanical properties of the product is of great importance. Injection-moulding of thin-walled polymer products tends to leave the polymer structure in a state where the mechanical properties are anisotropic, due to alignment of polymer chains along the melt flow direction. The anisotropic elastic-viscoplastic properties of low-density polyethylene, that has undergone an injection-moulding process, are therefore examined in the present work. Test specimens were punched out from injection-moulded plates and tested in uniaxial tension. Three in-plane material directions were investigated. Because of the small thickness of the plates, only the in-plane properties could be determined. Tensile tests with both monotonic and cyclic loading were performed, and the local strains on the surface of the test specimens were measured using image analysis. True stress vs. true strain diagrams were constructed, and the material response was evaluated using an elastic-viscoplasticity law. The components of the anisotropic compliance matrix were determined together with the direction-specific plastic hardening parameters. © 2017 The Author(s)

Place, publisher, year, edition, pages
Springer New York LLC , 2018. Vol. 58, no 1, p. 75-86
Keywords [en]
Anisotropic, Constitutive behaviour, Elasticity, Injection-moulding, LDPE, Polyethylene, Tensile, Viscoplasticity, Anisotropy, Low density polyethylenes, Mechanical properties, Molding, Plasticity, Plates (structural components), Polyethylenes, Polymers, Strain, Tensile testing, Thin walled structures, Anisotropic elastic, Compliance matrixes, Elastic-viscoplasticity, Manufacturing process, Monotonic and cyclic loading, Injection molding
National Category
Other Mechanical Engineering
Identifiers
URN: urn:nbn:se:bth-15095DOI: 10.1007/s11340-017-0322-yISI: 000418799700006Scopus ID: 2-s2.0-85027718634OAI: oai:DiVA.org:bth-15095DiVA, id: diva2:1137796
Funder
Knowledge Foundation, 20150165
Note

Open access

Available from: 2017-09-01 Created: 2017-09-01 Last updated: 2019-03-28Bibliographically approved
In thesis
1. Mechanics and Failure in Thin Material Layers: Towards Realistic Package Opening Simulations
Open this publication in new window or tab >>Mechanics and Failure in Thin Material Layers: Towards Realistic Package Opening Simulations
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The final goal of this PhD-work is an efficient and user-friendly finite element modelling strategy targeting an industrial available package opening application.  In order to reach this goal, different experimental mechanical and fracture mechanical tests were continuously refined to characterize the studied materials. Furthermore, the governing deformation mechanisms and mechanical properties involved in the opening sequence were quantified with full field experimental techniques to extract the intrinsic material response. An identification process to calibrate the material model parameters with inverse modelling analysis is proposed. Constitutive models, based on the experimental results for the two continuum materials, aluminium and polymer materials, and how to address the progressive damage modelling have been concerned in this work. The results and methods considered are general and can be applied in other industries where polymer and metal material are present.                                                                   

This work has shown that it is possible to select constitutive material models in conjunction with continuum material damage models, adequately predicting the mechanical behaviour in thin laminated packaging materials. Finally, with a slight modification of already available techniques and functionalities in a commercial general-purpose finite element software, it was possible to build a simulation model replicating the physical behaviour of an opening device. A comparison of the results between the experimental opening and the virtual opening model showed a good correlation.

The advantage with the developed modelling approach is that it is possible to modify the material composition of the laminate. Individual material layers can be altered, and the mechanical properties, thickness or geometrical shape can be changed. Furthermore, the model is flexible and a new opening design with a different geometry and load case can easily be implemented and changed in the simulation model. Therefore, this type of simulation model is prepared to simulate sustainable materials in packages and will be a useful tool for decision support early in the concept selection in technology and development projects.

Place, publisher, year, edition, pages
Karlskrona: Blekinge Tekniska Högskola, 2019. p. 140
Series
Blekinge Institute of Technology Doctoral Dissertation Series, ISSN 1653-2090 ; 9
Keywords
aluminium foil, FEM, LDPE, localisation, necking, polymer, progressive damage, semi-crystalline, simulation, virtual twin
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:bth-17748 (URN)978-91-7295-374-1 (ISBN)
Public defence
2019-05-29, J1650, BTH, Campus Gräsvik, Karlskrona, 13:30 (English)
Opponent
Supervisors
Available from: 2019-03-28 Created: 2019-03-28 Last updated: 2019-05-09Bibliographically approved

Open Access in DiVA

fulltext(1814 kB)252 downloads
File information
File name FULLTEXT01.pdfFile size 1814 kBChecksum SHA-512
89c5a61ee7ab72e8582a6c346ee7b1834308bb59f28b48ad6d792c491b51d78c572ccf457b475e55576399c47b053f657c6a5b6cb42dff16cc536872da314f7f
Type fulltextMimetype application/pdf

Other links

Publisher's full textScopusAnisotropic Elastic-Viscoplastic Properties at Finite Strains of Injection-Moulded Low-Density Polyethylene

Authority records BETA

Andreasson, Eskil

Search in DiVA

By author/editor
Andreasson, Eskil
By organisation
Department of Mechanical Engineering
In the same journal
Experimental mechanics
Other Mechanical Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 252 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 399 hits
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