Characterisation and micromechanical modelling of the elasto-viscoplastic behavior of thermoplastic elastomers |
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| Affiliation: | 1. Laboratoire d’Ingénierie des Matériaux de Bretagne (LIMATB-UBS), Université Européenne de Bretagne, rue de Saint-Maudé, 56321 Lorient, France;2. Kunststofftechnik, Institut für Allgemeinen Maschinenbau und Kunststofftechnik, Technische Universität Chemnitz (TUC), Reichenhainer Strasse 70, Zi. D 19, D-09126 Chemnitz, Germany;1. Department of Design and Mathematics, the University of the West of England, Bristol BS16 1QY, UK;2. Bristol Composites Institute (ACCIS), University of Bristol, Bristol BS8 1TR, UK;3. Department of Mechanical and Aerospace Engineering, University of Strathclyde, 75 Montrose Street, Glasgow G1 1XJ, UK;1. Department of Design and Mathematics, The University of the West of England, Bristol BS16 1QY, UK;2. Department of Mechanical and Aerospace Engineering, University of Strathclyde, 75 Montrose Street, Glasgow G1 1XJ, UK;3. Structural Integrity & Composites Group, Faculty of Aerospace Engineering, Delft University of Technology, The Netherlands;4. Bristol Composites Institute (ACCIS), University of Bristol, Bristol BS8 1TR, UK;1. Paderborn University, Applied Mechanics (FAM), Pohlweg 47-49, 33098 Paderborn, Germany;2. Paderborn University, Laboratory for Materials and Joining Technology (LWF), Pohlweg 47-49, 33098 Paderborn, Germany;1. KTH Royal Institute of Technology, The Marcus Wallenberg Laboratory for Sound and Vibration Research (MWL), SE-10044 Stockholm, Sweden;2. KTH Royal Institute of Technology, Solid Mechanics, SE-10044 Stockholm, Sweden;3. Scania, SE-151 87 Södertälje, Sweden |
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| Abstract: | The first objective of this study is to characterise the physico-chemical and mechanical properties of thermoplastic elastomers (TPE) and their constituents. In parallel with the experimental study, a model describing the mechanical behaviour of such materials at room temperature and without damage is proposed. The composite materials studied in the present work are processed by blending particles of vulcanized rubber ethylene-propylene-diene (EPDM) into an isotactic polypropylene (PP) matrix. These particles, obtained from a recycling process, have an average diameter of 70 m. The constitutive equation for TPE composites is developed within the framework of a self-consistent micromechanical approach which considers the mechanical behaviour of each phase. A preliminary analysis of various TPE in linear elasticity justifies the choice of a morphological pattern for the model, which views elastomer particles as embedded in the thermoplastic matrix. In the non-linear domain, the PP matrix is modelled by means of an elastoviscoplastic model whose parameters are fitted using tensile and instrumented spherical micro-indentation tests. The elastomer exhibits viscoelastic behaviour. Having determined the material parameters by inverse analysis, the proposed micromechanical model is compared with tensile and bending tests performed before damage initiation and for various elastomers contents. |
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| Keywords: | Micromechanical model Thermoplastic elastomer Rubber recycling |
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