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Anisotropic Elastic-Viscoplastic Properties at Finite Strains of Injection-Moulded Low-Density Polyethylene
Linnaeus University, SWE.
Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
Tetra Pak AB, SWE.
Tetra Pak AB, SWE.
Visa övriga samt affilieringar
2018 (Engelska)Ingår i: Experimental mechanics, ISSN 0014-4851, E-ISSN 1741-2765, Vol. 58, nr 1, s. 75-86Artikel i tidskrift (Refereegranskat) 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)

Ort, förlag, år, upplaga, sidor
Springer New York LLC , 2018. Vol. 58, nr 1, s. 75-86
Nyckelord [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
Nationell ämneskategori
Annan maskinteknik
Identifikatorer
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
Forskningsfinansiär
KK-stiftelsen, 20150165
Anmärkning

Open access

Tillgänglig från: 2017-09-01 Skapad: 2017-09-01 Senast uppdaterad: 2019-03-28Bibliografiskt granskad
Ingår i avhandling
1. Mechanics and Failure in Thin Material Layers: Towards Realistic Package Opening Simulations
Öppna denna publikation i ny flik eller fönster >>Mechanics and Failure in Thin Material Layers: Towards Realistic Package Opening Simulations
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Karlskrona: Blekinge Tekniska Högskola, 2019. s. 140
Serie
Blekinge Institute of Technology Doctoral Dissertation Series, ISSN 1653-2090 ; 9
Nyckelord
aluminium foil, FEM, LDPE, localisation, necking, polymer, progressive damage, semi-crystalline, simulation, virtual twin
Nationell ämneskategori
Maskinteknik
Identifikatorer
urn:nbn:se:bth-17748 (URN)978-91-7295-374-1 (ISBN)
Disputation
2019-05-29, J1650, BTH, Campus Gräsvik, Karlskrona, 13:30 (Engelska)
Opponent
Handledare
Tillgänglig från: 2019-03-28 Skapad: 2019-03-28 Senast uppdaterad: 2019-05-09Bibliografiskt granskad

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