Fracture and fatigue performance of reaction injection molded polyamide block copolymers and their milled fiber reinforced composites

J. Karger-Kocsis, J. Daugaard, L. Amby

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The fracture and failure behavior of a reaction injection molded (RIM) polyamide block copolymers (NBC) without and with milled glass fiber (GF) reinforcement were studied at ambient temperature by tensile, static and dynamic fracture and cyclic fatigue loadings. It was established that with increasing soft segment or GF filler content both stiffness and strength were reduced whereas ductility parameters of the NBCs increased. The static fracture toughness decreased with increasing polyol content and proved to be unaffected by GF filling. The dynamic fracture toughness parameters (toughness and energy) derived from instrumented Charpy and Izod measurements agreed very well with one another. The resistance to fatigue crack propagation (FCP) deteriorated with increasing soft segment or GF filler content. The changes observed were attributed to the effects of the molecular build-up of the NBC, to the inherent porosity of the material due to molding, and its alteration by GF filling.

Original languageEnglish
Pages (from-to)39-70
Number of pages32
JournalJournal of Polymer Engineering
Volume11
Issue number1-2
DOIs
Publication statusPublished - 1992

Fingerprint

Nylons
Polyamides
Glass fibers
Block copolymers
Fatigue of materials
Fibers
Composite materials
Fillers
Fracture toughness
Polyols
Fiber reinforced materials
Fatigue crack propagation
Molding
Toughness
Ductility
Porosity
Stiffness
fiberglass
Temperature

Keywords

  • Charpy specimen
  • composite
  • dynamic fracture
  • failure
  • fatigue crack growth
  • fracture mechanics
  • glass fiber reinforcement
  • impact bending
  • Izod specimen
  • Nyrim®, polyamide-6 block copolymer
  • reaction injection molding (RIM)
  • reinforced RIM
  • static fracture
  • thermoplastic matrix composite

ASJC Scopus subject areas

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

Cite this

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title = "Fracture and fatigue performance of reaction injection molded polyamide block copolymers and their milled fiber reinforced composites",
abstract = "The fracture and failure behavior of a reaction injection molded (RIM) polyamide block copolymers (NBC) without and with milled glass fiber (GF) reinforcement were studied at ambient temperature by tensile, static and dynamic fracture and cyclic fatigue loadings. It was established that with increasing soft segment or GF filler content both stiffness and strength were reduced whereas ductility parameters of the NBCs increased. The static fracture toughness decreased with increasing polyol content and proved to be unaffected by GF filling. The dynamic fracture toughness parameters (toughness and energy) derived from instrumented Charpy and Izod measurements agreed very well with one another. The resistance to fatigue crack propagation (FCP) deteriorated with increasing soft segment or GF filler content. The changes observed were attributed to the effects of the molecular build-up of the NBC, to the inherent porosity of the material due to molding, and its alteration by GF filling.",
keywords = "Charpy specimen, composite, dynamic fracture, failure, fatigue crack growth, fracture mechanics, glass fiber reinforcement, impact bending, Izod specimen, Nyrim{\circledR}, polyamide-6 block copolymer, reaction injection molding (RIM), reinforced RIM, static fracture, thermoplastic matrix composite",
author = "J. Karger-Kocsis and J. Daugaard and L. Amby",
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AU - Karger-Kocsis, J.

AU - Daugaard, J.

AU - Amby, L.

PY - 1992

Y1 - 1992

N2 - The fracture and failure behavior of a reaction injection molded (RIM) polyamide block copolymers (NBC) without and with milled glass fiber (GF) reinforcement were studied at ambient temperature by tensile, static and dynamic fracture and cyclic fatigue loadings. It was established that with increasing soft segment or GF filler content both stiffness and strength were reduced whereas ductility parameters of the NBCs increased. The static fracture toughness decreased with increasing polyol content and proved to be unaffected by GF filling. The dynamic fracture toughness parameters (toughness and energy) derived from instrumented Charpy and Izod measurements agreed very well with one another. The resistance to fatigue crack propagation (FCP) deteriorated with increasing soft segment or GF filler content. The changes observed were attributed to the effects of the molecular build-up of the NBC, to the inherent porosity of the material due to molding, and its alteration by GF filling.

AB - The fracture and failure behavior of a reaction injection molded (RIM) polyamide block copolymers (NBC) without and with milled glass fiber (GF) reinforcement were studied at ambient temperature by tensile, static and dynamic fracture and cyclic fatigue loadings. It was established that with increasing soft segment or GF filler content both stiffness and strength were reduced whereas ductility parameters of the NBCs increased. The static fracture toughness decreased with increasing polyol content and proved to be unaffected by GF filling. The dynamic fracture toughness parameters (toughness and energy) derived from instrumented Charpy and Izod measurements agreed very well with one another. The resistance to fatigue crack propagation (FCP) deteriorated with increasing soft segment or GF filler content. The changes observed were attributed to the effects of the molecular build-up of the NBC, to the inherent porosity of the material due to molding, and its alteration by GF filling.

KW - Charpy specimen

KW - composite

KW - dynamic fracture

KW - failure

KW - fatigue crack growth

KW - fracture mechanics

KW - glass fiber reinforcement

KW - impact bending

KW - Izod specimen

KW - Nyrim®, polyamide-6 block copolymer

KW - reaction injection molding (RIM)

KW - reinforced RIM

KW - static fracture

KW - thermoplastic matrix composite

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