Fracture and failure behavior of glass fiber mat-reinforced structural nylon rim composites

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6 Citations (Scopus)

Abstract

Fracture and related failure behavior of continuous glass fiber (GF) mat reinforced nylon block copolymer (NBC) were studied at monotonic increased loading (static fracture) at different temperatures (T = -40. 80 °C). The use of preplaced GFmat resulted in an Improvement of fracture toughness (Kc). Kc increased considerably with increasing deformation rate in contrast to the composites with discontinuous GF reinforcement. Failure characteristics were studied using transmitted light and scanning electron microscopy. It was shown that the onset of failure in this thermoplastic matrix composite is due to development of kinked strands. This process is permitted by a a network-type transformation of the GF mat in this very ductile NBC matrix. The bent strands split up afterwards by fracture before being separated by pull-out events. Through knowledge of this failure sequence further material improvement can be achieved. It was supposed that an optimum in mechanical performance is related to a critical “mesh size” of the GF mat network. This size should strongly depend on the matrix properties, especially on that of ductility.

Original languageEnglish
Pages (from-to)153-173
Number of pages21
JournalJournal of Polymer Engineering
Volume11
Issue number1-2
DOIs
Publication statusPublished - Jun 1992

Keywords

  • NyrimR
  • failure
  • fracture mechanics
  • glass fiber mat
  • polyamide-6 block polymer
  • reaction injection molding (RIM)
  • static fracture
  • structural RIM
  • thermoplastic matrix composite

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Polymers and Plastics
  • Materials Chemistry

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