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Effects of recycled HDPE and nanoclay on stress cracking of HDPE by correlating J(c) with slow crack growth

机译：再生HDPE和纳米荧光对HDPE与缓慢裂纹生长的胁迫开裂的影响

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摘要

The effects of recycled high density polyethylene (HDPE) and nanoclay on the stress crack resistance (SCR) of pristine HDPE were evaluated using the Notched Constant Ligament Stress (NCLS) test. The test data were analyzed by both linear elastic fracture mechanics (LEFM) and elastic plastic fracture mechanics (EPFM). The LEFM approach uses the stress intensity factor K to define the two failure mechanisms: creep and slow crack growth (SCG). In contrast, using the J-integral in EPFM, which emphasizes the nonlinear elastic-plastic strain field at the crack-tip, revealed a short-term failure stage prior to the creep failure. In this article, a power law correlation between the fracture toughness J(c) and SCG was found under a plane-strain condition. Increasing recycled HDPE content lowered the SCG resistance of pristine HDPE by decreasing J(c). Adding nanoclay up to 6 wt% also decreased J(c) while simultaneously, lowering the stress relaxation of nanocomposites, leading to longer SCG failure times at low J values. POLYM. ENG. SCI., 58:1471-1478, 2018. (c) Published [2017]. This article is a U.S. Government work and is in the public domain in the USA.
机译：使用缺口恒定韧带应力（NCLS）试验评估再循环的高密度聚乙烯（HDPE）和纳米荧光对原始HDPE应力裂纹抗性（SCR）的影响。通过线性弹性骨折力学（液晶）和弹性塑料骨折力学（EPFM）分析测试数据。 lefm方法使用应力强度因子k来定义两个故障机制：蠕变和慢裂纹生长（SCG）。相反，使用EPFM中的J-Integral，它强调裂缝尖端的非线性弹性塑性应变场，在蠕变失效之前揭示了短期失效阶段。在本文中，在平面 - 应变条件下发现断裂韧性J（C）和SCG之间的权力律相关性。增加再生HDPE含量通过减少J（C）降低了原始HDPE的SCG电阻。将纳米粘土添加至6wt％也在同时降低J（c），同时降低纳米复合材料的应力松弛，导致低J值的较长速度。聚合物。 eng。 SCI。，58：1471-1478,2018。（c）已发表[2017]。本文是美国政府工作，并在美国的公共领域。

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