聚乙烯管材应变硬化模量与裂纹扩展速率相关性研究

doi:10.19491/j.issn.1001-9278.2018.09.016

中国塑料 ›› 2018, Vol. 32 ›› Issue (09): 96-101.DOI: 10.19491/j.issn.1001-9278.2018.09.016

聚乙烯管材应变硬化模量与裂纹扩展速率相关性研究

李茂东¹,陈国华²,杨波³,黄晓之²,王志刚¹

1. 广州特种承压设备检测研究院
2. 华南理工大学安全科学与工程研究所
3. 广州市特种承压设备检测研究院

收稿日期:2018-03-30 修回日期:2018-04-20 出版日期:2018-09-26 发布日期:2018-10-25
基金资助:
国家质检总局科技计划项目;广东省省级科技计划项目;广州市科技计划项目

Research on Correlation of Strain Hardening Modulus and Crack Growth Rate of Polyethylene Pipes

Received:2018-03-30 Revised:2018-04-20 Online:2018-09-26 Published:2018-10-25

摘要/Abstract

摘要： 采用应变硬化试验和锥体试验分别得到不同聚乙烯100（PE100）管材试样的应变硬化模量和裂纹扩展速率，并对它们之间的相关性进行研究，以期验证应变硬化试验法评价PE管材耐慢速裂纹扩展性能的正确性。结果表明，锥体试验中PE管材试样的裂纹扩展程度随着试验时间的增加而增大；应变硬化试验和锥体试验对不同PE管材试样的耐慢速裂纹扩展性能评价结果完全相同，应变硬化试验法评价PE管材耐慢速裂纹扩展性能的正确性得到验证；应变硬化试验不仅误差较小，而且可以区分不同牌号PE100管材耐慢速裂纹扩展性能的细微差异，评价结果相对于锥体试验要更加可靠。

Abstract: Slow crack growth (SCG) is one of the main reasons for the brittle failure of polyethylene (PE) pipes. The SCG resistance of PE pipes should be evaluated strictly before formally service. In this paper, the strain-hardening modulus and crack growth rate of different types of PE pipe specimens (PE100) were obtained from strain-hardening and cone tests, respectively, and their correlation was studied to verify the validity of strain-hardening test for the evaluation of slow crack growth resistance of PE pipes. The results indicated that the crack growth degree of PE pipe specimens increased with an increase of test time, and the strain-hardening test results for different PE pipe specimens were identical to the cone test ones. The validity of strain-hardening test method for the evaluation of slow crack growth performance of PE pipes was also confirmed. The strain-hardening test not only had a small error but also made the subtle differences of slow crack growth resistance distinguished from different brands of PE100 pipes. The strain-hardening test results were more reliable than those of the cone ones.

李茂东陈国华杨波黄晓之王志刚. 聚乙烯管材应变硬化模量与裂纹扩展速率相关性研究[J]. 中国塑料, 2018, 32(09): 96-101.

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聚乙烯管材应变硬化模量与裂纹扩展速率相关性研究

Research on Correlation of Strain Hardening Modulus and Crack Growth Rate of Polyethylene Pipes

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