Abstract
The change of fracture resistance of medium density polyethylene (MDPE) has been studied over a wide time interval using SEN-T specimens. Employing first-level sampling (FLS) method, time dependence of the fracture toughness (KQ) was revealed in 2.6×105 h (∼30 years) interval. Based on the measured data, time-related fracture mechanical properties were determined, that characterise the long-term fracture behaviour of polyethylene. Using infrared spectroscopy (IR), a relationship was detected between the change of fracture mechanical properties and the oxidative degradation of polyethylene. The results are applicable for long-term fracture mechanical design of polyethylene.
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