Bravo Alencar, Toubal Lotfi, Koffi Demagna, Erchiqui Fouad
Laboratory of mechanics and eco-materials, University of Quebec at Trois-Rivières, 3351, boul. des Forges, C.P. 500, Trois-Rivières (Québec) G9A 5H7, Canada.
Laboratory of biomaterials, University of Quebec at Abitibi-Témiscamingue, 445, boul. de l'Université, Rouyn-Noranda (Quebec) J9X 5E4, Canada.
Materials (Basel). 2015 Nov 2;8(11):7322-7341. doi: 10.3390/ma8115382.
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, , 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.
尽管近年来在生态友好型天然纤维增强复合材料（包括某些具有生物源基体的复合材料）中使用声发射（AE）方面已取得了一定的认识，但在理解绿色复合材料和生物复合材料损伤行为差异方面仍存在知识空白。因此，本文通过能更好反映实际应用的试验，即加载-卸载和蠕变试验，研究了两种可比较的绿色复合材料和生物复合材料的行为，以确定损伤过程的演变。将力学结果与声发射结果进行比较，可以得出结论：添加偶联剂（CA）显著降低了声发射损伤与力学损伤的比例。CA对绿色复合材料具有极其有益的影响，因为在循环试验中凯泽效应占主导地位。在蠕变试验中，使用CA还避免了两种复合材料过渡到新的损伤阶段。由于具有相似性能的生物复合材料和绿色复合材料在诸如循环和蠕变等试验中表现出不同的损伤过程，而仅使用单调试验之前无法理解这些过程，因此必须谨慎选择PE绿色材料的长期应用。
