Abstract
AbstractThe rate/temperature dependence of yield stress, tensile modulus and crack opening displacement of phenolphthalein poly(ether ketone) (PEK‐C) has been investigated. The rate/temperature dependence of crack opening displacement and the correlation established between stress intensity factor, KIC, yield stress, and type of crack growth suggest that the extent of crack tip blunting largely governs the relative toughness of PEK‐C and induces transitions in the types of crack growth observed. A quantitative expression is then presented which successfully describes the fracture toughness values over a wide range of temperatures and rates.
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