MDPE and HDPE Pipe Fittings Published literature shows 80°C fatigue stressing can induce HDPE (4) (6) and MDPE (21) (29) pipe fittings to fail, with the fittings failing prior to the pipe, see Figures 10 (a) and (b). The failures were brittle (4) (21 ) , the accumulated creep damage small (4) (21) (29) and the plots of log ACtt against log N* gave reasonable straight line plots over the substantial range of AffH values investigated, see Figure 10. These observations infer that these HDPE ...
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