Testing and Processing # 1979 Brigthon
The construction of apparatus for cyclic pressure fatigue testing of 60 mm and 168 mm diameter plastic pipes is described. The results of tests at 1 Hz at 20°C and at 10°C at various stress amplitudes and mean stress levels are given for 60 mm diameter uPVC pipe. A comparison is made between specimen lifetime and fatigue crack growth rates obtained in sheet specimens. Scanning electron micrographs of fatigue grown crack surfaces in pipes are shown and discussed in relation to the stress levels at which they were grown.