Intra-laminar toughening mechanisms to enhance impact damage tolerance of 2D woven composite laminates via yarn-level fiber hybridization and fiber architecture
Intra-laminar toughening mechanisms to enhance impact damage tolerance of 2D woven composite laminates via yarn-level fiber hybridization and fiber architecture
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DOI：
10.1002/pc.25325
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发表时间：
2019-12-01
影响因子：
5.2
通讯作者：
Potluri, Prasad
中科院分区：
文献类型：
--
作者：
Dalfi, Hussein;Katnam, Kali B.;Potluri, Prasad
先进复合材料广泛用于一级和二级结构应用，例如航空航天、汽车、船舶和可再生能源领域。但是，复合材料层合板的抗冲击性能和损伤容限普遍较差，这对结构优化设计是一个重大挑战。在这方面，进行了实验研究，以提高二维机织复合材料层合板的损伤容限，探索纱线级纤维杂交。混合纱线是通过将高强度纤维（S-玻璃纤维）和高韧性纤维（聚丙烯[PP]）混合，并使用混合和包芯工艺生产的。使用混合纱线，2D织物，即具有5 H缎纹，2/2斜纹和2/2篮状结构，被编织，并且随后混合S-玻璃/PP/环氧树脂层压板通过真空辅助树脂灌注制造。通过15 J、25 J、35 J和50 J等不同能量水平的落锤冲击试验，研究了混杂层合板的低速冲击响应和能量吸收特性。通过冲击后压缩（CAI）试验，测量了损伤层合板的剩余抗压强度，研究了损伤容限。此外，使用扫描电子显微镜的破坏模式进行了研究，以确定在混合层压板的冲击和CAI测试后的损伤机制。5 H缎纹，2/2蓝，和2/2篮织物层压板的冲击响应和损伤容限进行了比较与noncrimp织物层压板（即，S-玻璃/PP纱线）和无（即，S-玻璃纱线）纱线级杂交。结果表明，纱线级杂交和纤维结构显着影响的冲击行为和损伤容限的二维机织S-玻璃/PP/环氧树脂混杂层压板的研究。显微镜的研究表明，纱线内，纱线间，层间失效机制，一般可以引入纱线级纤维杂交和纤维结构相结合，用于修改故障和能量耗散机制下的低速冲击，因此复合材料层合板的损伤容限。
Advanced composites are widely used in primary and secondary structural applications, for example, aerospace, automotive, marine, and renewable energy sectors. But it is well recognized that the impact resistance and damage tolerance of composite laminates are in general poor, which is a major challenge for optimizing structural designs. In this regard, an experimental study is conducted for enhancing the damage tolerance of 2D woven composite laminates by exploring yarn-level fiber hybridization. Hybrid yarns are produced by combing high-strength fibers, that is, S-glass, and high-toughness fibers, that is, polypropylene [PP], and using commingling and core-wrapping processes. Using the hybrid yarns, 2D fabrics, that is, with 5H satin, 2/2 twill, and 2/2 basket architectures, are weaved, and subsequently hybrid S-glass/PP/epoxy laminates are manufactured via vacuum assisted resin infusion. The low velocity impact response and energy absorption of the hybrid laminates are investigated by drop-weight impact tests at different energy levels, that is, 15 J, 25 J, 35 J, and 50 J. The damage tolerance is studied by compression-after-impact (CAI) tests, measuring the residual compressive strength of the damaged laminates. Furthermore, the failure modes are investigated using scanning electron microscopy for identifying damage mechanisms in the hybrid laminates after the impact and CAI tests. The impact response and damage tolerance of the 5H satin, 2/2 twill, and 2/2 basket fabric laminates are compared with that of noncrimp-fabric laminates produced with (ie, S-glass/PP yarns) and without (ie, S-glass yarns) yarn-level hybridization. It is shown that yarn-level hybridization and fiber architecture significantly affect the impact behavior and damage tolerance of the 2D woven S-glass/PP/epoxy hybrid laminates investigated. The microscopy studies show that intra-yarn, inter-yarn, inter-lamina failure mechanisms can in general be introduced by combining yarn-level fiber hybridization and fiber architecture for modifying failure and energy dissipation mechanisms under low velocity impact and hence the damage tolerance of composite laminates.