Journal of Materials Science

, Volume 30, Issue 14, pp 3658–3661 | Cite as

Temperature and strain-rate dependence of fracture toughness of phenolphthalein polyether ketone

  • Yanchun Han
  • Yuming Yang
  • Binyao Li
  • Zhiliu Feng


A strong strain-rate and temperature dependence was observed for the fracture toughness of phenolphthalein polyether ketone (PEK-C). Two separate crack-blunting mechanisms have been proposed to account for the fracture-toughness data. The first mechanism involves thermal blunting due to adiabatic heating at the crack tip for the high temperatures studied. In the high-temperature range, thermal blunting increases the fracture toughness corresponding to an effectively higher test temperature. However, in the low-temperature range, the adiabatic temperature rise is insufficient to cause softening and JIC increases with increasing temperature owing to viscoelastic losses associated with the Β-relaxation there. The second mechanism involves plastic blunting due to shear yield/flow processes at the crack tip and this takes place at slow strain testing of the single-edge notched bending (SENB) samples. The temperature and strain-rate dependence of the plastic zone size may also be responsible for the temperature and strain-rate dependence of fracture toughness.


Fracture Toughness Plastic Zone Strain Testing Zone Size Phenolphthalein 
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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • Yanchun Han
    • 1
  • Yuming Yang
    • 1
  • Binyao Li
    • 1
  • Zhiliu Feng
    • 1
  1. 1.Changchun Institute of Applied ChemistryAcademia SinicaChangchunPeople’s Republic of China

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