Abstract
The stress analysis and fracture analysis of pipeline by water hammer has seldom been studied because water hammer effect is the dynamic phenomena except the water hammer created by gradually closed valve in a long line. In this research experiments of pipe fracture were conducted in order to examine the difference between the strength of the PVC test pipes by water hammer in about 0.07 second loading and by static pressure in about two minutes loading. The pressure of dynamic fracture by water hammer was about 25% higher than the static fracture, though the loading time difference is 2, 000 times. From this result it is possible that the static stress analysis could be applied to the pipe to the pipe fracture by water hammer even in a case of sudden valve closure.
