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Mechanical properties of phenolphthalein polyether ketone: Yield stress, young's modulus, and fracture toughness
Author(s) -
Han Yanchun,
Yang Yuming,
Li Binyao,
Feng Zhiliu
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070560811
Subject(s) - fracture toughness , materials science , composite material , yield (engineering) , modulus , ultimate tensile strength , toughness , viscoelasticity , stress (linguistics) , stress intensity factor , fracture mechanics , philosophy , linguistics
A series of tensile and three‐point bending studies was conducted at various temperatures and loading rates using phenolphthalein polyether ketone (PEK‐C). Yield stress, Young's modulus, fracture toughness, and crack opening displacement data were obtained for various conditions. In general, both yield stress and Young's modulus increase with decreasing temperature. However, the relationships between fracture toughness, loading rate, and temperature are very complex. This behavior is due to the simultaneous intersection of viscoelasticity and localized plastic deformation. The increased yield stress is the main factor contributing to the reduction in fracture toughness and crack opening displacement. The relationship between fracture toughness and yield stress are discussed. © 1995 John Wiley & Sons, Inc.