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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
Papers

Abstract

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.

Keywords

Fracture Toughness Plastic Zone Strain Testing Zone Size Phenolphthalein 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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