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Mechanical Characterization of Talc Particle Filled Thermoplastics

In this paper, we present the experimental part of the development for an integrative simulation with Moldex3D and LS-DYNA for talc particle lled polypropylene. The properties of thermoplastic polymers considerably depend on the process of moulding irre- spective of the geometry of the part and the raw polymer used. Both, the polymer structure resulting from moulding and formation of weld lines may show a large inuence on mechanical properties. For analysing the inuence of injection moulding on the resulting structural part properties, plates with dierent processing conditions were fabricated with Hostacom XBR169G, a polypropy- lene (PP) lled with rubber and talc. Afterwards, dierent test samples, longitudinal and lateral to ow direction, were milled out from the fabricated plates. Using this extracted test samples, the true deformation and failure behaviour were measured by uniaxial tensile tests and shear tests at small and high strain rates. The complex deformation behaviour was determined by grey-scale correlation strain measurement. The analysis of quasistatic uniaxial tensile tests shows anisotropic eects depending on the prepa- ration direction of the specimen in stress behaviour as well as in Poisson's ratio. This also can be seen at dierent testing temperatures and at high strain rates. The reason of the anisotropic eects might be an orientation of the talc particles. In all experiments, the strain at failure is not inuenced by testing direction. The measured data provide the basis for a material model, which is implemented in LS-DYNA. The model is validated by a three-point bending test.