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Article

Identification of the LLDPE Constitutive Material Model for Energy Absorption in Impact Applications

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New Technologies—Research Centre, University of West Bohemia, 301 00 Plzeň, Czech Republic
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Faculty of Applied Sciences, University of West Bohemia, 301 00 Plzeň, Czech Republic
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MECAS ESI s.r.o., Brojova 2113, 326 00 Plzeň, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editor: Mauro Zarrelli
Polymers 2021, 13(10), 1537; https://doi.org/10.3390/polym13101537
Received: 23 March 2021 / Revised: 29 April 2021 / Accepted: 6 May 2021 / Published: 11 May 2021
(This article belongs to the Section Polymer Analysis and Characterization)
Current industrial trends bring new challenges in energy absorbing systems. Polymer materials as the traditional packaging materials seem to be promising due to their low weight, structure, and production price. Based on the review, the linear low-density polyethylene (LLDPE) material was identified as the most promising material for absorbing impact energy. The current paper addresses the identification of the material parameters and the development of a constitutive material model to be used in future designs by virtual prototyping. The paper deals with the experimental measurement of the stress-strain relations of linear low-density polyethylene under static and dynamic loading. The quasi-static measurement was realized in two perpendicular principal directions and was supplemented by a test measurement in the 45° direction, i.e., exactly between the principal directions. The quasi-static stress-strain curves were analyzed as an initial step for dynamic strain rate-dependent material behavior. The dynamic response was tested in a drop tower using a spherical impactor hitting a flat material multi-layered specimen at two different energy levels. The strain rate-dependent material model was identified by optimizing the static material response obtained in the dynamic experiments. The material model was validated by the virtual reconstruction of the experiments and by comparing the numerical results to the experimental ones. View Full-Text
Keywords: LLDPE; quasi-static and dynamic experimental tests; impact energy absorption; material parameter identification; constitutive material model; validation; simulation LLDPE; quasi-static and dynamic experimental tests; impact energy absorption; material parameter identification; constitutive material model; validation; simulation
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MDPI and ACS Style

Hynčík, L.; Kochová, P.; Špička, J.; Bońkowski, T.; Cimrman, R.; Kaňáková, S.; Kottner, R.; Pašek, M. Identification of the LLDPE Constitutive Material Model for Energy Absorption in Impact Applications. Polymers 2021, 13, 1537. https://doi.org/10.3390/polym13101537

AMA Style

Hynčík L, Kochová P, Špička J, Bońkowski T, Cimrman R, Kaňáková S, Kottner R, Pašek M. Identification of the LLDPE Constitutive Material Model for Energy Absorption in Impact Applications. Polymers. 2021; 13(10):1537. https://doi.org/10.3390/polym13101537

Chicago/Turabian Style

Hynčík, Luděk, Petra Kochová, Jan Špička, Tomasz Bońkowski, Robert Cimrman, Sandra Kaňáková, Radek Kottner, and Miloslav Pašek. 2021. "Identification of the LLDPE Constitutive Material Model for Energy Absorption in Impact Applications" Polymers 13, no. 10: 1537. https://doi.org/10.3390/polym13101537

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