Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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

Version 1 : Received: 23 March 2021 / Approved: 24 March 2021 / Online: 24 March 2021 (13:38:40 CET)

A peer-reviewed article of this Preprint also exists.

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. 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.

Journal reference: Polymers 2021, 13, 1537
DOI: 10.3390/polym13101537

Abstract

Current industrial trends bring new challenges in energy absorbing systems. Polymer materials as the traditional packaging material seem to be promising due to their low weight, structure and production price. Based on the review, the linear low-density polyethylene 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 design by virtual prototyping. The paper deals with the experimental measurement of the stress-strain relations of the linear low-density polyethylene under static and dynamic loading. The quasi-static measurement is realized in two perpendicular principal directions and is supplemented by a test measurement in the 45 degrees direction, i.e. exactly between the principal directions. The quasi-static stress-strain curves are analyzed as an initial step for dynamic strain rate dependent material behavior. The dynamic response is tested in the drop tower using a spherical impactor hitting the flat material multi-layered specimen at two different energy levels. The strain rate dependent material model is identified by optimizing the static material response obtained in the dynamic experiments. The material model is validated by the virtual reconstruction of the experiments and by comparing the numerical results to the experimental ones.

Keywords

LLDPE; quasi-static and dynamic experimental tests, impact energy absorption; material parameter identification; constitutive material model; validation; simulation

Subject

MATERIALS SCIENCE, Biomaterials

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