Abstract
AbstractA survey of pipe installation damage in Australia has shown that when pipes are installed in water reticulation systems, they often have significant levels of damage or notches that can be considered as sharp, i.e. less than 25 μm notch tip radius. Experimental investigations of the effect of simulated sharp notches of varying depth on uPVC pipes subjected to a representative cyclic pressure regime show that there is a relationship between the depth of the notch and the cycles to failure. With damage less than 1·2 mm deep, corresponding to a stress intensity factor of 0·2 MPa,m, a fatigue crack threshold exists, below which cracks do not grow and consequently pipe lifetimes in excess of 100 years can be expected for pipes installed under such cyclic pressure conditions.
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