Temperature and strain-rate effects on the fracture toughness of poly(ether ether ketone) and its short glass-fibre reinforced composite

J. Karger-Kocsis, K. Friedrich

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

Constant-strain-rate mechanical testing and surface fractography were used for the fracture mechanical characterization of poly(ether ether ketone) (PEEK) and its short glass-fibre reinforced composite. Testing was performed as a function of temperature, strain rate and heat treatment. The fracture toughness of both materials is highly dependent on these factors causing either brittle or ductile damage. At high strain rate, a brittle-ductile transition was observed in the Kc-T curve of the PEEK matrix at 115°C. This could be interpreted as an isothermal-adiabatic transition superimposed on the glass transition. A similar, but less intense, transition was observed for the composite at higher temperaure (roughly at Tg = 144°C). This shift in the real Tg region of PEEK can be explained by the presence of fibres which enhance the thermal conductivity, thus acting as heat sinks and drastically reducing the adiabatic heating effects of the crack tip. Heat annealing caused an increase in the crystallinity and a decrease in the fracture toughness. Reasonable agreement was found between the Kc values derived from the established J integral and those measured.

Original languageEnglish
Pages (from-to)1753-1760
Number of pages8
JournalPolymer (United Kingdom)
Volume27
Issue number11
DOIs
Publication statusPublished - 1986

Fingerprint

Polyether ether ketones
Glass fibers
Fracture toughness
Strain rate
Composite materials
Fractography
Mechanical testing
Heat sinks
Crack tips
Temperature
Glass transition
Thermal conductivity
Heat treatment
Annealing
Heating
Fibers
Testing
fiberglass

Keywords

  • composite
  • effects of temperature and strain rate
  • fibre reinforcing
  • fracture toughness
  • poly(ether ether ketone)

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

Cite this

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title = "Temperature and strain-rate effects on the fracture toughness of poly(ether ether ketone) and its short glass-fibre reinforced composite",
abstract = "Constant-strain-rate mechanical testing and surface fractography were used for the fracture mechanical characterization of poly(ether ether ketone) (PEEK) and its short glass-fibre reinforced composite. Testing was performed as a function of temperature, strain rate and heat treatment. The fracture toughness of both materials is highly dependent on these factors causing either brittle or ductile damage. At high strain rate, a brittle-ductile transition was observed in the Kc-T curve of the PEEK matrix at 115°C. This could be interpreted as an isothermal-adiabatic transition superimposed on the glass transition. A similar, but less intense, transition was observed for the composite at higher temperaure (roughly at Tg = 144°C). This shift in the real Tg region of PEEK can be explained by the presence of fibres which enhance the thermal conductivity, thus acting as heat sinks and drastically reducing the adiabatic heating effects of the crack tip. Heat annealing caused an increase in the crystallinity and a decrease in the fracture toughness. Reasonable agreement was found between the Kc values derived from the established J integral and those measured.",
keywords = "composite, effects of temperature and strain rate, fibre reinforcing, fracture toughness, poly(ether ether ketone)",
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AU - Karger-Kocsis, J.

AU - Friedrich, K.

PY - 1986

Y1 - 1986

N2 - Constant-strain-rate mechanical testing and surface fractography were used for the fracture mechanical characterization of poly(ether ether ketone) (PEEK) and its short glass-fibre reinforced composite. Testing was performed as a function of temperature, strain rate and heat treatment. The fracture toughness of both materials is highly dependent on these factors causing either brittle or ductile damage. At high strain rate, a brittle-ductile transition was observed in the Kc-T curve of the PEEK matrix at 115°C. This could be interpreted as an isothermal-adiabatic transition superimposed on the glass transition. A similar, but less intense, transition was observed for the composite at higher temperaure (roughly at Tg = 144°C). This shift in the real Tg region of PEEK can be explained by the presence of fibres which enhance the thermal conductivity, thus acting as heat sinks and drastically reducing the adiabatic heating effects of the crack tip. Heat annealing caused an increase in the crystallinity and a decrease in the fracture toughness. Reasonable agreement was found between the Kc values derived from the established J integral and those measured.

AB - Constant-strain-rate mechanical testing and surface fractography were used for the fracture mechanical characterization of poly(ether ether ketone) (PEEK) and its short glass-fibre reinforced composite. Testing was performed as a function of temperature, strain rate and heat treatment. The fracture toughness of both materials is highly dependent on these factors causing either brittle or ductile damage. At high strain rate, a brittle-ductile transition was observed in the Kc-T curve of the PEEK matrix at 115°C. This could be interpreted as an isothermal-adiabatic transition superimposed on the glass transition. A similar, but less intense, transition was observed for the composite at higher temperaure (roughly at Tg = 144°C). This shift in the real Tg region of PEEK can be explained by the presence of fibres which enhance the thermal conductivity, thus acting as heat sinks and drastically reducing the adiabatic heating effects of the crack tip. Heat annealing caused an increase in the crystallinity and a decrease in the fracture toughness. Reasonable agreement was found between the Kc values derived from the established J integral and those measured.

KW - composite

KW - effects of temperature and strain rate

KW - fibre reinforcing

KW - fracture toughness

KW - poly(ether ether ketone)

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