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Damage Characterization of Bio and Green Polyethylene–Birch Composites under Creep and Cyclic Testing with Multivariable Acoustic Emissions

机译：蠕变和循环测试中多变量声发射对生物和绿色聚乙烯桦木复合材料的损伤表征

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摘要

Despite the knowledge gained in recent years regarding the use of acoustic emissions (AEs) in ecologically friendly, natural fiber-reinforced composites (including certain composites with bio-sourced matrices), there is still a knowledge gap in the understanding of the difference in damage behavior between green and biocomposites. Thus, this article investigates the behavior of two comparable green and biocomposites with tests that better reflect real-life applications, i.e., load-unloading and creep testing, to determine the evolution of the damage process. Comparing the mechanical results with the AE, it can be concluded that the addition of a coupling agent (CA) markedly reduced the ratio of AE damage to mechanical damage. CA had an extremely beneficial effect on green composites because the Kaiser effect was dominant during cyclic testing. During the creep tests, the use of a CA also avoided the transition to new damaging phases in both composites. The long-term applications of PE green material must be chosen carefully because bio and green composites with similar properties exhibited different damage processes in tests such as cycling and creep that could not be previously understood using only monotonic testing.
机译：尽管近年来获得了有关在生态友好的天然纤维增强复合材料（包括某些具有生物来源基质的复合材料）中使用声发射（AE）的知识，但在了解损害差异方面仍然存在知识差距绿色和生物复合材料之间的行为。因此，本文通过更好地反映实际应用的测试（即负载卸载和蠕变测试）来研究两种可比较的绿色和生物复合材料的行为，以确定破坏过程的演变。将机械结果与AE进行比较，可以得出结论，添加偶联剂（CA）显着降低了AE损伤与机械损伤的比率。 CA对绿色复合材料具有极其有益的作用，因为在循环测试中，Kaiser效应占主导地位。在蠕变测试期间，CA的使用还避免了两种复合材料都过渡到新的破坏阶段。 PE环保材料的长期应用必须谨慎选择，因为具有类似特性的生物和环保复合材料在诸如循环和蠕变等测试中表现出不同的破坏过程，而以前仅使用单调测试是无法理解的。

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