Measure of porosity in flax fibres reinforced polylactic acid biocomposites
Measure of porosity in flax fibres reinforced polylactic acid biocomposites
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DOI：
10.1016/j.compositesa.2020.106183
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发表时间：
2021-02-01
影响因子：
8.7
通讯作者：
Scarpa, Fabrizio
中科院分区：
文献类型：
--
作者：
de Kergariou, Charles;Le Duigou, Antoine;Scarpa, Fabrizio
本文介绍了一种测量天然纤维复合材料孔隙率的优化策略。特别强调的是热成型亚麻纤维增强聚乳酸（FFRPLA）层压板。评估和比较了六种不同的孔隙度测量方法：乙醇和水中的重力测量法、扫描电子显微镜（SEM）、计算机断层扫描（CT）扫描、光学显微镜测量和拉伸试验的反识别。测量结果表明孔隙度在3.5%至21%之间。确定了一种由ct扫描和重力测量提供的孔隙度上界和下界组成的测量方法。该区间的下界代表了有效孔隙度的最佳近似值，对于本工作测试的FFRPLA，其有效孔隙度为8.3 +/- 2.3%。这种方法也可以推广到其他类似的天然纤维增强复合材料。
The paper describes an optimised strategy to measure the porosity in natural fibre composites. Particular emphasis is placed on thermoformed flax fibres reinforced poly-lactic acid (FFRPLA) laminates. Six different methods to measure the porosity were evaluated and compared: gravitometry in ethanol and in water, scanning electron microscopy (SEM), computed tomography (CT) scanning, optical microscope measurements and inverse identification from tensile tests. The measurements indicate porosity levels ranging from 3.5% to 21%. A measurement approach consisting of defining lower and upper bounds of porosity provided by CT-scanning and gravimetric measurements in water was identified. The lower bound of this interval represents the best approximation of the effective porosity, which is 8.3 +/- 2.3% for the FFRPLA tested in this work. The approach could be also extended to other similar classes of natural fibre reinforced composites.