Abstract
Stress intensity factor ( K) — crack speed ( a ̇ ) relationships have been obtained for environmental stress cracking ( ESC) of specimens of a high density polyethylene having different thermal treatments. Also, scanning electron microscope examination of ESC fracture surfaces has been carried out and correlation between K and the fracture surface appearance has been established. It appears that at low values of K the failure takes place by interlamellar crack propagation; as K increases the mechanism undergoes a transition to void formation and growth, with voids beginning to appear within the spherulites. At high K the failure is entirely by void formation and growth.
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