| 聚乙烯压力管道裂纹快速扩展性及止裂性测试 |
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| 引用本文： | 刘厚俊,张玉凤,霍立兴.聚乙烯压力管道裂纹快速扩展性及止裂性测试[J].中国塑料,2003,17(4):82-85. |
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| 作者姓名： | 刘厚俊 张玉凤 霍立兴 |
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| 作者单位： | 天津大学材料科学与工程学院 天津300072
(刘厚俊，张玉凤)，天津大学材料科学与工程学院 天津300072(霍立兴) |
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| 摘 要： | 聚乙烯压力管道在低温时易出现裂纹快速扩展，其破坏一般都具有突发性，难以预防。本文采用小尺寸稳态试验方法，测试了在不同温度下，裂纹扩展长度随压强的变化情况，同时也测试了在不同压强下，裂纹扩展长度随温度的变化情况。通过计算分析，确定了裂纹快速扩展的临界压强和临界温度。给出了影响该试验结果的因素如温度、压力、介质、裂纹扩展速度及裂纹尖端的流体减压等。并通过试验测试了焊缝以及套筒对塑料管道开裂的影响。最后给出了塑料管道在实际运行中的一些具体的止裂措施。
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| 关 键 词： | 聚乙烯 裂纹快速扩展 小尺寸稳态 流体减压 止裂 裂纹扩展驱动力 |
Rapid Crack Propagation and Arrest Test for Polyethylene Pressure Pipes |
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| LIU Hou-jun,ZHANG Yu-feng,HUO Li-xing.Rapid Crack Propagation and Arrest Test for Polyethylene Pressure Pipes[J].China Plastics,2003,17(4):82-85. |
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| Authors: | LIU Hou-jun ZHANG Yu-feng HUO Li-xing |
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| Abstract: | At lower temperature,rapid crack propagation(RCP)of polyethylene (PE) pressure plastic pipelines will happen easily.Furthermore, the destructive effect is abrupt and very difficult to prevent. S4 test method is used to test how crack propagation length varies with the pressure at different temperature,and how it varies with the temperature at different pressure.Critical pressure and the critical temperature of RCP are determined by calculation and analysis.And factors influencing this experiment such as temperature,pressure,medium,crack propagation velocity and fluid decompression ahead of the crack tip are presented.Finally, some specific arrest measures in practical application are given. |
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| Keywords: | polyethylene rapid crack propagation small scale steady state fluid decompression arrest crack driving force for propagation |
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