圧力脈動下における塩ビ管のクラック進展則による寿命予測
キーワード:
Polyvinyl chloride pipe,
Oscillating pressures,
Fatigue failure,
Crack propagation rate,
Lifetime predictions
2020 年 26 巻 1 号 p. 25-32
詳細
2020 年 26 巻 1 号 p. 25-32
In the dry field irrigation pipeline, under some mean pressure, it receives repetitive fluctuating pressure due to the operation of the terminal sprinkler. Therefore, even when a pressure lower than the design water pressure is applied, fatigue fracture which is presumed to be caused by the material in the PVC (Polyvinyl chloride) pipe may occur in some cases. Therefore, in addition to the average pressure, the lifetime of the PVC pipe subjected to repetitive oscillating pressures pulsation is predicted using the fatigue crack propagation rate. As a result, the number of life cycles by model calculation is roughly in agreement with the cycle estimated from accident cases of fatigue fracture at the site, and it became clear that lifetime predictions by the crack propagation rate is possible to some extent.
