Comparison of the failure mode in short and long glass fiber-reinforced injection-molded polypropylene composites by acoustic emission

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Abstract

The failure mode in injection-molded short (SGF) and long glass fiber (LGF) reinforced polypropylene (PP) was studied on compact tension (CT) specimens simultaneously by acoustic emission (AE) and transmitted light microscopy. A significant difference was revealed in the failure manner characterized by the cumulative run, amplitude and energy distribution curves between the SGF- and LGF-PP both in the crack initiation and propagation stage. It was established that the failure of SGF-PP did not alter with the loading; this composite failed mostly by matrix deformation along with fiber/matrix debonding and some fiber pull-out. The failure mode of the LGF-PP differed from that scenario, since fiber fracture was resolved in every stage of the loading. On the contrary to SGF-PP, the failure of this composite was governed by fiber-related events (fracture, pull-out, debonding). The amplitude and energy of the AE signals were assigned to individual failure events and thus the failure sequence concluded.

Original languageEnglish
Pages (from-to)495-501
Number of pages7
JournalPolymer Bulletin
Volume31
Issue number4
DOIs
Publication statusPublished - Oct 1 1993

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Polymers and Plastics
  • Materials Chemistry

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