高密度聚乙烯管道对接接头断裂参量统计分布

Statistic distribution of resistance to initiation property of high density polyethylene gas pipe butt-fusion welded joint

摘要: 以裂纹张开位移(crack opening displacement)特征值参量为基础,对国内燃气工业中应用日益普及的高密度聚乙烯(HDPE)管道热熔对接接头的抗开裂特性参量的分散性及统计分布进行了研究。结果表明,HDPE热熔对接接头在低温下,其抗开裂参量饱和启裂COD值具有一定的分散性。对其进行拟合统计检验结果表明,三参数威布尔分布为其最佳拟合分布。并且,随着温度的降低,抗开裂参量的数据的分散性变小。

Abstract: The statistic distribution of the resistance to initiation property of HDPE(high density polyethylene) pipe butt-fusion welded joint was investigated on the basis of Crack Opening Displacement(COD).The results show that the saturation initial crack COD δ_is of HDPE butt-fusion welded joint have the statistic variance inherently.The statistic probabilistic model was set up to fit the distribution function of δ_is.Performed several statistic tests,the results show that the optimum fitting distribution of δ_is weibull distribution with three parameters.The variance of test results decreases with decreasing temperature.