Constitutive Modeling of the Tensile Behavior of Recycled Polypropylene-Based Composites

The effect of reprocessing on the quasi-static uniaxial tensile behavior of two commercial polypropylene (PP)-based composites is experimentally investigated and modeled. In particular, the studied materials consist of an unfilled high-impact PP and a talc-filled high-impact PP. These PP composites...

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Bibliographic Details
Published in:Materials 2019-07, Vol.12 (15), p.2419
Main Authors: Wang, Kui, Peng, Yong, Matadi Boumbimba, Rodrigue, Bahlouli, Nadia, Pessey, Daniel, Ahzi, Said, Addiego, Frédéric, Rémond, Yves
Format: Article
Language:English
Subjects:
Cold extrusion
Computer simulation
Crack propagation
Engineering Sciences
Environmental management
Environmental protection
Extrusion dies
Fillers
Flow velocity
Granulation
Granulators
Materials selection
Mechanical properties
Mechanics
Molecular weight
Pellets
Plates
Polymer matrix composites
Raw materials
Recycling
Strain hardening
Strain rate
True strain
Twin screw extruders
Waste management
Water baths
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Summary:The effect of reprocessing on the quasi-static uniaxial tensile behavior of two commercial polypropylene (PP)-based composites is experimentally investigated and modeled. In particular, the studied materials consist of an unfilled high-impact PP and a talc-filled high-impact PP. These PP composites are subjected to repeated processing cycles, including a grinding step and an extrusion step to simulate recycling at the laboratory level, the selected reprocessing numbers for this study being 0, 3, 6, 9, and 12. Because the repeated reprocessing leads to thermo-mechanical degradation by chain scission mechanisms, the tensile behavior of the two materials exhibits a continuous decrease of elastic modulus and failure strain with the increasing amount of reprocessing. A physically consistent three-dimensional constitutive model is used to predict the tensile response of non-recycled materials with strain rate dependence. For the recycled materials, the reprocessing effect is accounted by incorporating the reprocessing sensitive coefficient into the constitutive model for Young's modulus, failure strain, softening, and hardening equations. Our predictions of true stress-true strain curves for non-recycled and recycled 108MF97 and 7510-are in good agreement with experimental data and can be useful for industries and companies which are looking for a model able to predict the recycling effect on mechanical behavior of polymer-based materials.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma12152419