Abstract
AbstractCreep crack growth experiments under static loads were done with two polyethylene high density (PE‐HD) types stabilised in two different ways. The degree of oxidation at the cracks was estimated by CO‐numbers measured with FT‐IR spectroscopy. The CO‐number is the ratio of the peak of oxidation products at approx. 1720 cm−1 to an inherent PE‐HD‐peak at 2020 cm−1 and represents a direct measure for oxidative damage. Higher CO‐numbers could be measured near the crack surfaces. However, this phenomenon could only be found in the low crack growth rate regime, where sufficient time is available for oxidation processes to take place. Moreover, local ageing decreases very quickly in some distance away from the crack path. A direct influence of different stabiliser systems on the degree of these local ageing processes could not be found.
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