Using strain hardening to predict the stress crack resistance of unaged and aged smooth black HDPE geomembranes

IF 4.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Geotextiles and Geomembranes Pub Date : 2024-04-04 DOI:10.1016/j.geotexmem.2024.03.003

M. Ali, R. Kerry Rowe, F.B. Abdelaal

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引用次数: 0

Abstract

The correlation between the single-point notched constant tensile load-stress crack resistance (SP-NCTL SCR) Test (ASTM D5397; Appendix) of smooth high density polyethylene (HDPE) geomembranes and their strain hardening modulus is investigated for both unaged and aged specimens. The strain hardening modulus was calculated based on the (force-elongation) raw data from the tensile strength test conducted at room temperature using Type IV and/or Type V specimens (as described in ASTM D638) at a test speed of 7 mm/min. Three different approaches are used to define the strain hardening modulus and to compare the representative strain hardening modulus with the SP-NCTL SCR. It is shown that the high test speed of 7 mm/min performed at room temperature provides a good correlation with the SP-NCTL SCR of different smooth black HDPE geomembranes. Additionally, the proposed method using Type V specimens predicts the SCR values during oxidative degradation close to those observed using the SP-NCTL SCR test. For the resins and conditions examined, the proposed method provides a quick assessment of the SP-NCTL SCR of unaged geomembranes when the SP-NCTL SCR takes long testing times (e.g., >1000 h) or in jurisdictions in which the use of surfactants becomes prohibited to allow conducting the SP-NCTL SCR tests.

查看原文本刊更多论文

利用应变硬化预测未老化和老化黑色光滑高密度聚乙烯土工膜的抗应力开裂性能

针对未老化和老化试样，研究了光滑高密度聚乙烯（HDPE）土工膜的单点缺口恒定拉伸载荷-应力抗裂性（SP-NCTL SCR）测试（ASTM D5397；附录）与其应变硬化模量之间的相关性。应变硬化模量是根据室温下使用 IV 型和/或 V 型试样（如 ASTM D638 所述）以 7 毫米/分钟的测试速度进行拉伸强度测试的（力-伸长）原始数据计算得出的。使用三种不同的方法来定义应变硬化模量，并将代表性应变硬化模量与 SP-NCTL SCR 进行比较。结果表明，在室温下以 7 毫米/分钟的高测试速度进行的测试与不同黑色光滑高密度聚乙烯土工膜的 SP-NCTL SCR 具有良好的相关性。此外，使用 V 型试样的拟议方法预测的氧化降解过程中的 SCR 值接近使用 SP-NCTL SCR 测试观察到的值。对于所研究的树脂和条件，当 SP-NCTL SCR 测试时间较长（例如 1000 小时）或在禁止使用表面活性剂以进行 SP-NCTL SCR 测试的地区，所提出的方法可快速评估未老化土工膜的 SP-NCTL SCR。

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来源期刊

Geotextiles and Geomembranes 地学-地球科学综合

CiteScore

9.50

自引率

21.20%

发文量

111

审稿时长

59 days

期刊介绍： The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.