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首页> 美国卫生研究院文献>Materials >Mechanical Performance of Unstitched and Silk Fiber-Stitched Woven Kenaf Fiber-Reinforced Epoxy Composites
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Mechanical Performance of Unstitched and Silk Fiber-Stitched Woven Kenaf Fiber-Reinforced Epoxy Composites

机译：无丝绸纤维缝合梭织骨膜纤维增强环氧复合材料的机械性能

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摘要

Fiber composites are known to have poor through-thickness mechanical properties due to the absence of a Z-direction binder. This issue is more critical with the use of natural fibers due to their low strength compared to synthetic fibers. Stitching is a through-thickness toughening method that is used to introduce fibers in the Z-direction, which will result in better through-thickness mechanical properties. This research was carried out to determine the mechanical properties of unstitched and silk fiber-stitched woven kenaf-reinforced epoxy composites. The woven kenaf mat was stitched with silk fiber using a commercial sewing machine. The specimens were fabricated using a hand lay-up method. Three specimens were fabricated, one unstitched and two silk-stitched with deferent stitching orientations. The results show that the stitched specimens have comparable in-plane mechanical properties to the unstitched specimens. For the tensile mechanical test, stitched specimens show similar and 17.1% higher tensile strength compared to the unstitched specimens. The flexural mechanical test results show around a 9% decrease in the flexural strength for the stitched specimens. On the other hand, the Izod impact mechanical test results show a significant improvement of 33% for the stitched specimens, which means that stitching has successfully improved the out-of-plane mechanical properties. The outcome of this research indicates that the stitched specimens have better mechanical performance compared to the unstitched specimens and that the decrease in the flexural strength is insignificant in contrast with the remarkable enhancement in the impact strength.
机译：已知纤维复合材料由于不存在Z方向粘合剂而具有差的贯穿机械性能。与合成纤维相比，由于它们的低强度，这种问题对于使用天然纤维来说更为关键。缝合是一种通过厚度增韧方法，用于在Z方向上引入纤维，这将导致更好的厚度机械性能。进行该研究以确定未缝合纤维纤维织物织造骨膜增强环氧基复合材料的机械性能。采用商用缝纫机缝合了编织的Kenaf垫与丝绸纤维缝合。使用手放置方法制造标本。制造了三种标本，一个未缝合的两种丝绸缝合，具有推进缝合取向。结果表明，缝合试样对未缝合的标本具有可比面内机械性能。对于拉伸机械测试，与未缝合的样品相比，缝合样品显示出类似的抗拉强度较高的抗拉强度。弯曲机械测试结果显示缝合样品的弯曲强度的约9％降低。另一方面，Izod冲击机械测试结果对于缝合样品显示出33％的显着提高，这意味着缝合成功地改善了平面外的机械性能。该研究的结果表明，与未缝合的样品相比，缝合样品具有更好的机械性能，并且抗弯强度的降低与撞击强度的显着增强相比，抗弯强度的降低是微不足道的。

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