Filler/matrix-debonding and micro-mechanisms of deformation in particulate filled polypropylene composites under tension

Michael Jerabek, Zoltan Major, Károly Renner, János Móczó, Béla Pukánszky, Reinhold W. Lang

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Volume strain measurements of particulate filled polypropylene (PP) composites containing different glass beads and talc as filler were carried out in tension as a function of temperature and strain rate to determine the micro-mechanisms of deformation. While local cavitation mechanisms (micro-voiding, crazing, and micro-cracking) and subsequent debonding of the particles dominated as failure mechanisms at high strain rates and at room temperature, a more significant contribution of local shear yielding was observed with a reduced contribution of cavitational mechanisms at low strain rates or at 80 °C. This change in the dominating micro-mechanisms of deformation resulted in smaller volume strains during the tensile loading of the composites than for the respective neat matrix. Moreover, a novel approach is introduced for the detection of debonding using volume strain measurements, which takes into account the dilatational and deviatoric behavior of the neat matrix polymer and the composite. The results are supported by acoustic emission measurements carried out simultaneously on the same specimens.

Original languageEnglish
Pages (from-to)2040-2048
Number of pages9
JournalPolymer
Volume51
Issue number9
DOIs
Publication statusPublished - Apr 20 2010

Keywords

  • Micro-mechanisms of deformation
  • Particulate filled polypropylene
  • Volume strain

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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