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首页> 外文期刊>Journal of Applied Polymer Science >Effect of stabilization on creep crack growth in high-density polyethylene
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Effect of stabilization on creep crack growth in high-density polyethylene

机译：稳定化对高密度聚乙烯蠕变裂纹扩展的影响

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摘要

Polyolefins, particularly polyethylene, are known to fail via crack initiation and crack propagation when exposed to multiaxial long-term static stresses at elevated temperatures. Using concepts of linear elastic fracture mechanics, this article describes and discusses the effects of stabilization on the kinetics of creep crack growth (CCG) in high-density polyethylene (PE-HD) and the failure micro-mechanisms involved. As for the influence of stabilization, six PE-HD formulations (two polymer types, each with three stabilizer systems) were investigated. CCG initiation times and CCG rates were determined at 60 and 80degreesC in distilled water as functions of the crack tip stress field characterized by the stress intensity factor. Although no influence of the stabilizer type was found in either polymer type for CCG initiation times and CCG rates at high crack speeds, significant effects of the added stabilizer type and concentration were detected for low CCG rates. The observed phenomena were explained in terms of local aging processes in the immediate vicinity of the crack tip, which were controlled by the presence and content of various stabilizers. (C) 2003 Wiley Periodicals, Inc. [References: 73]
机译：当在高温下暴露于多轴长期静态应力时，聚烯烃，特别是聚乙烯，会因裂纹引发和裂纹扩展而失效。本文使用线性弹性断裂力学的概念，描述并讨论了稳定化对高密度聚乙烯（PE-HD）中蠕变裂纹扩展（CCG）动力学和所涉及的破坏微机制的影响。关于稳定化的影响，研究了六种PE-HD配方（两种聚合物类型，每种都有三种稳定剂体系）。在60和80℃的蒸馏水中，根据裂纹尖端应力场的函数确定CCG起始时间和CCG速率，以应力强度因子为特征。尽管在高裂纹速度下，两种聚合物类型对CCG引发时间和CCG速率均未发现稳定剂类型的影响，但对于低CCG速率，检测到添加的稳定剂类型和浓度的显着影响。观察到的现象是根据裂纹尖端附近的局部时效过程来解释的，该时效过程由各种稳定剂的存在和含量控制。 （C）2003 Wiley Periodicals，Inc. [参考：73]

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