A novel hybridised composite sandwich core with Glass, Kevlar and Zylon fibres - Investigation under low-velocity impact
A novel hybridised composite sandwich core with Glass, Kevlar and Zylon fibres - Investigation under low-velocity impact
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DOI：
10.1016/j.ijimpeng.2019.103430
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发表时间：
2020-03-01
影响因子：
5.1
通讯作者：
Leng, Jinsong
中科院分区：
文献类型：
--
作者：
Zangana, Sartip;Epaarachchi, Jayantha;Leng, Jinsong
介绍了一种新型纤维复合材料夹层芯材。梯形波纹芯层玻璃纤维夹层结构由芳纶纤维和赛隆纤维混杂而成，以改善其动态冲击性能。复合芯材由四层玻璃纤维制成，其中一层被凯夫拉纤维或赛隆纤维取代，形成混杂复合芯材(玻璃与凯夫拉或玻璃与赛隆的比例为75：25)。在30J、40J和50J动能水平下进行低速冲击试验，研究了复合材料夹层的冲击行为、损伤模式、比吸收能和冲击后的剩余强度。实验结果表明，当冲击能量超过阈值时，含有高性能纤维的混合三明治表现出极好的性能。在实验工作和数值模拟过程中的观察证实，玻璃-凯夫拉和玻璃-赛隆杂化可以通过最小化应力集中来消除严重的堆芯破裂，并在不增加结构重量的情况下提供高比能量。此外，采用玻璃-尼龙杂化技术，梯形波纹夹芯夹芯结构在撞击后的强度和刚度损失可分别减少56%和69%。在此基础上，提出了预测复合材料夹芯剩余强度的经验公式。
A novel fibre composite sandwich core has been introduced in this study. Trapezoidal corrugated core glass-fibre sandwich structures were hybridised using Kevlar and Zylon fibres to improve the dynamic impact performance. The composite cores were fabricated with four layers of glass fibre and one of the layers was replaced either by Kevlar or Zylon fibre to create hybrid composite core (Glass-to-Kevlar or Glass-to-Zylon ratio 75:25). The impact behaviour, damage mode, specific absorbed energy, and residual strength after the impact of the composite sandwiches were investigated using a low-velocity impact test with 30 J, 40 J and 50 J kinetic energy level. The experimental results revealed that the hybridised sandwiches with high-performance fibre are performing extremely well when subjected to impact energy above the threshold limit. The observations during the experimental work and numerical simulation have confirmed that Glass-Kevlar and Glass-Zylon hybridisation can eliminate severe core rupture by minimising stress concentration and provide high specific energy without increasing structural weight. Moreover, the loss of strength and stiffness of trapezoidal corrugated core sandwich structures after an impact event can be minimised up to 56% and 69%, respectively using Glass-Zylon hybridisation technique. Furthermore, an empirical relationship for predicting the residual strength of the composite core sandwich is proposed.