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Effect of installation damage on the lifetime of upvc pipes subjected to cyclic pressures
Author(s) -
Burn L. Stewart
Publication year - 1991
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4990260305
Subject(s) - materials science , radius , composite material , cyclic stress , stress (linguistics) , geotechnical engineering , structural engineering , geology , engineering , linguistics , philosophy , computer security , computer science
A 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.