Dynamic Collapse Test of Cracked Pipes

摘要

In order to clarify the behavior of cracked pipes under seismic events, cyclic four point bending tests were conducted on the staight pipes with flaws. In the tests, real stress corrosion cracks (SCC) and artificial electric discharge machining (EDM) motches were induced on pipes as flaws. The specimens were subjected to the constant amplitude loading wave or the random amplitude wave. In comparison with the natural crack as SCC and the artificial crack as EDM notch, the EDM notch was easier to cause the leak of water than SCC. For the estimation of the failure on the cracked pipes. Net Section Collapse Failure Criterion (NSCFC) has been proposed and widely used under the monotonic loading conditions. To extend the thought of NSCFC to the cyclic loading condition, the method using NSCFC and fatigue life prediction was found to be useful.