Valencia Fabuer R, Castillo-López Germán, Aurrekoetxea Jon, Lopez-Arraiza Alberto
Institut für Mechanik und Statik, Universität der Bundeswehr München, 85577 Neubiberg, Germany.
Civil, Material and Manufacturing Engineering Department, Escuela de Ingenierías Industriales, University of Málaga, 29016 Málaga, Spain.
Polymers (Basel). 2022 Sep 27;14(19):4038. doi: 10.3390/polym14194038.
The present paper explores a new concept of a hybrid eco-composite by substituting the natural fibre plies with thin wood veneers. The new composite, named Fibre-Wood Laminate (FWL), is inspired by fibre-metal laminate materials. The studied FWL configuration consisted of a single thin pinewood veneer at each of the outer layers of a flax woven fabric reinforced bio-epoxy composite manufactured by infusion. Three-point bending results showed that wood veneer gives a highly anisotropic nature to the FWL. In the best case, with the grain of the wood at 0°, the stiffness and the strength increased by 28 and 41%, respectively, but reduced the strain-at-break by 27% compared to the flax fibre reinforced bio-epoxy (FFRB). The penetration and perforation energy thresholds and the peak force of the FWL obtained by falling weight impact tests were 32, 29, and 31% lower than those of the FFRB, respectively. This weakening was due to using single wood veneers, so the challenge for improving impact properties will be to explore thicker FWLs with different stacking sequences and orientations. The effect of immersing the FWL in seawater also showed considerable differences. The epoxy matrix filled the cellular structure of the wood veneers, creating a barrier effect and reducing the amount of water absorbed by the flax fibres.
本文通过用薄木单板替代天然纤维层来探索一种新型混合生态复合材料的概念。这种名为纤维 - 木材层压板（FWL）的新型复合材料受到纤维 - 金属层压板材料的启发。所研究的FWL结构由通过灌注制造的亚麻织物增强生物环氧树脂复合材料的每个外层中的单个薄松木单板组成。三点弯曲结果表明，木单板赋予FWL高度各向异性的性质。在最佳情况下，当木材纹理处于0°时，与亚麻纤维增强生物环氧树脂（FFRB）相比，其刚度和强度分别提高了28%和41%，但断裂应变降低了27%。落锤冲击试验获得的FWL的穿透和穿孔能量阈值以及峰值力分别比FFRB低32%、29%和31%。这种弱化是由于使用了单个木单板，因此提高冲击性能的挑战将是探索具有不同堆叠顺序和取向的更厚的FWL。将FWL浸入海水中的效果也显示出相当大的差异。环氧基质填充了木单板的蜂窝结构，产生了阻隔效应并减少了亚麻纤维吸收的水量。
