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首页> 外文期刊>Composites >Balsa sandwich composite fracture study: Comparison of laminated to solid balsa core materials and debonding from thick balsa core materials
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Balsa sandwich composite fracture study: Comparison of laminated to solid balsa core materials and debonding from thick balsa core materials

机译：轻木夹芯复合材料断裂研究：层压轻木与固体轻木芯材料的比较以及厚轻木芯材料的剥离

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摘要

We examined various fracture properties relevant to the use of balsa as a thick core material in sandwich composites with unidirectional glass fiber/vinyl ester composite skins designed for bridge decks. The first experiments compared the fracture toughness of a laminated veneer lumber (LVL) made from balsa to the toughness of conventional butcher-block balsa material. When using a good lamination adhesive, an LVL balsa core material has enhanced toughness compared to solid balsa and the LVL balsa also has enhanced fiber bridging effects. When balsa core is adhered to fiber glass composite skins, the vinyl ester resin used for bonding may infuse into the low density balsa. The second experiments looked at effects of infusing that resin on both LVL and solid balsa properties. Although the infusing caused a detrimental 15-20% increase in core material density, the infused resin had little or no affect on toughness compared to non-infused balsa. Finally, we looked at debonding toughness between fiber glass skins and a thick balsa core. The debonding toughness was higher than balsa toughness and increased with crack growth due to glass fibers bridging across the debonding fracture surface. Finite element analysis revealed that debonding a thin skin from thick balsa core in an asymmetric specimen is essentially a pure mode I process. (C) 2017 Elsevier Ltd. All rights reserved.
机译：我们检查了与将轻木用作厚夹芯材料有关的各种断裂性能，该夹芯复合材料具有专为桥梁甲板设计的单向玻璃纤维/乙烯基酯复合表皮。最初的实验将轻木制成的层压单板木材（LVL）的断裂韧性与传统的屠夫轻木材料的韧性进行了比较。当使用良好的层压胶粘剂时，LVL轻木芯材与固体轻木相比具有增强的韧性，并且LVL轻木还具有增强的纤维桥接作用。当轻木芯粘在玻璃纤维复合蒙皮上时，用于粘结的乙烯基酯树脂可能会注入到低密度轻木中。第二个实验研究了注入树脂对LVL和固体轻木特性的影响。尽管灌注会导致芯材密度增加15-20％，但与未灌注的轻木相比，灌注的树脂对韧性几乎没有影响。最后，我们研究了玻璃纤维蒙皮与较厚的轻木芯之间的脱粘韧性。由于玻璃纤维在整个脱粘断裂表面上桥接，因此脱粘韧性高于轻木韧性，并且随着裂纹的增长而增加。有限元分析表明，在不对称样品中从厚厚的轻木芯上剥离薄皮本质上是一种纯I型过程。 （C）2017 Elsevier Ltd.保留所有权利。

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