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塑料工业第 37卷第 5期
· 38· CH INA PLASTICS INDUSTRY 2009年 5月
材料测试含表面裂纹 PE管道临界失稳压力的计算与分析
与应用
李明阳, 陈国华
(华南理工大学安全科学与工程研究所, 广东广州 510640)
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摘要: 针对 PE管力学性能、缺陷尺寸及失效模式的不确定性, 建立基于可靠性分析计算 PE管临界失稳压力的
方法。计算得到不同管材、标准尺寸比、失效模式、裂纹类型下, 含表面裂纹 PE管的临界失稳压力- 管道裂纹深度
与管道壁厚比曲线, 分析各因素对该曲线的影响, 为 PE管的设计选材及安全评定提供指导。通过总结含表面裂纹 PE
管韧脆转化规律, 为确定管道失效模式, 防止管道脆性断裂提供理论依据。
关键词: PE管; 临界失稳压力; 表面裂纹; 韧脆转化; 可靠度
中图分类号: TQ320 72 + 4; TQ325 1 + 2 文献标识码: A 文章编号: 1005 - 5770 (2009) 05 - 0038 - 04
Ca lcula tion and Ana lysis of the Cr itica l Buckling Pressure of PE P ipes w ith Surface Crack
L IM ing yang, CHEN Guo hua
( Institute of Safety Sci. & Eng. , South China University of Technology, Guangzhou 510640, China)
Abstract: A im ing at the uncertainty of mechanical p roperties, failure modes and defect size of polyethy
lene ( PE) p ipe, a new method to calculate critical buckling p ressure of PE p ipe was established. W ith
differences of material, standard dimension ratio, failure mode and crack types, the critical buckling
p ressure the crack dep th and diameter ratio curves were obtained. The impacts of various factors on the curve
were analyzed, which could p rovide guidance for the design of material selection and safety assessment of PE
p ipes. Though summarizing the rule of toughness brittleness transition of PE p ipes with surface crack,