Linear-low-density polyethylene melt rheology: Extensibility and extrusion defects

1984 ◽  
Vol 24 (4) ◽  
pp. 268-274 ◽  
Author(s):  
D. Constantin
Keyword(s):  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Melt Rheology ◽  
Polyethylene Melt

Rheo-PIV analysis of the slip flow of a metallocene linear low-density polyethylene melt

2009 ◽  
Vol 49 (2) ◽  
pp. 145-154 ◽  
Author(s):  
Francisco Rodríguez-González ◽  
José Pérez-González ◽  
Lourdes de Vargas ◽  
Benjamín M. Marín-Santibáñez
Keyword(s):  
Slip Flow ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Piv Analysis ◽  
Polyethylene Melt

Temperature-dependent instabilities in the capillary flow of a metallocene linear low-density polyethylene melt

2000 ◽  
Vol 44 (3) ◽  
pp. 441-451 ◽  
Author(s):  
José Pérez-González ◽  
Lourdes de Vargas ◽  
Vladimı́r Pavlı́nek ◽  
Berenika Hausnerová ◽  
Petr Sáha
Keyword(s):  
Capillary Flow ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Temperature Dependent ◽  
Polyethylene Melt

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

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1537
Author(s):  
Luděk Hynčík ◽  
Petra Kochová ◽  
Jan Špička ◽  
Tomasz Bońkowski ◽  
Robert Cimrman ◽  
...  
Keyword(s):  
Strain Rate ◽  
Material Model ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Stress Strain ◽  
Rate Dependent ◽  
Constitutive Material Model ◽  
Principal Directions ◽  
Constitutive Material

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.

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