Anisotropic Elastic-Viscoplastic Properties at Finite Strains of Injection-Moulded Low-Density Polyethylene

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Anisotropic Elastic-Viscoplastic Properties at Finite Strains of Injection-Moulded Low-Density Polyethylene

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Publication Article, peer reviewed scientific
Title Anisotropic Elastic-Viscoplastic Properties at Finite Strains of Injection-Moulded Low-Density Polyethylene
Author Kroon, Martin ; Andreasson, Eskil ; Persson Jutemar, Elin ; Petersson, Viktor ; Persson, Leo ; Dorn, Michael ; Olsson, Pär
Date 2018
English abstract
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.
DOI https://doi.org/10.1007/s11340-017-0322-y (link to publisher's fulltext.)
Link https://link.springer.com/article/10.1007/s11340-017-0322-y .Icon
Publisher Springer
Host/Issue Experimental Mechanics;1
Volume 58
ISSN 1741-2765
Pages 75-86
Language eng (iso)
Subject Polyethylene
Anisotropic
Tensile
Viscoplasticity
Elasticity
LDPE
Injection-moulding
Constitutive behaviour
Technology
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/24245 Permalink to this page
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