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。
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.
出处
《中国塑料》
CAS
CSCD
北大核心
2003年第4期82-85,共4页
China Plastics
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
polyethylene
rapid crack propagation
small scale steady state
fluid decompression
arrest
crack driving force for propagation
