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Anisotropic Elastic-Viscoplastic Properties at Finite Strains of Injection-Moulded Low-Density Polyethylene
Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
Tetra Pak AB, Lund;Blekinge Technical University.
Tetra Pak AB, Lund.
Tetra Pak AB, Lund.
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2018 (English)In: Experimental mechanics, ISSN 0014-4851, E-ISSN 1741-2765, 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.

Place, publisher, year, edition, pages
Springer, 2018. no 1, p. 75-86
Keyword [en]
Polyethylene Anisotropic Tensile Viscoplasticity Elasticity LDPE Injection-moulding Constitutive behaviour
National Category
Composite Science and Engineering Textile, Rubber and Polymeric Materials
Research subject
Technology (byts ev till Engineering), Mechanical Engineering
Identifiers
URN: urn:nbn:se:lnu:diva-69427DOI: 10.1007/s11340-017-0322-yISI: 000418799700006OAI: oai:DiVA.org:lnu-69427DiVA: diva2:1168566
Available from: 2017-12-21 Created: 2017-12-21 Last updated: 2018-01-12Bibliographically approved

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Kroon, MartinDorn, Michael

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