Novel composite materials with tunable delamination resistance using functionalizable electrospun SBS fibers
Novel composite materials with tunable delamination resistance using functionalizable electrospun SBS fibers
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DOI：
10.1016/j.compstruct.2016.09.057
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发表时间：
2017
影响因子：
6.3
通讯作者：
S. V. D. Heijden;L. Daelemans;K. Bruycker;Robin Simal;I. Baere;W. Paepegem;H. Rahier;K. Clerck
中科院分区：
文献类型：
--
作者：
S. V. D. Heijden;L. Daelemans;K. Bruycker;Robin Simal;I. Baere;W. Paepegem;H. Rahier;K. Clerck
电纺纤维在层间增韧方面显示出很大的潜力。在这项工作中，电纺SBS纤维被加入到玻璃环氧层压板中。这些SBS纤维的机械性能使用三唑二酮交联剂进行调节，其中交联量越高，SBS纤维的断裂伸长率越低，硬度越高。因此，对电纺纤维的力学性能与I型和II型层间断裂韧性增强之间的关系提供了见解。SBS纤维的力学性能影响着复合材料的裂纹路径。非交联型和低交联型SBS纤维具有很低的刚性，在I型和II型加载条件下都会通过SBS纤维桥联促进裂纹扩展。然而，这些SBS纤维需要大幅伸长才能吸收大量能量(>；300%)。由于这只发生在I型加载条件下，I型层间断裂韧性可以得到改善。然而，模式II IFT受到了负面影响。另一方面，交联度较高的SBS纤维在伸长率低得多的情况下确实会消耗更多的能量。因此，它们可以显著提高II型层间断裂韧性。
Electrospun fibers have shown great potential for the interlaminar toughening. In this work, electrospun SBS fibers were incorporated into glass epoxy laminates. The mechanical properties of these SBS fibers are tuned using a triazolinedione cross-linker, where a higher amount of cross-linking gives rise to a lower elongation at break and a higher stiffness of the SBS fibers. Consequently, insights are provided into the relation between mechanical properties of electrospun fibers and enhancements in both Mode I and Mode II interlaminar fracture toughness. The SBS fiber’s mechanical properties affect the crack path in composites. Non and low cross-linked SBS fibers which have a very low stiffness promote crack growth with SBS fiber bridging under both Mode I and Mode II loading conditions. However, these SBS fibers need to elongate substantially in order to take up a significant amount energy (>300%). As this only occurs under Mode I loading conditions, the Mode I interlaminar fracture toughness can be improved. Nevertheless, the Mode II IFT is negatively affected. Higher cross-linked SBS fibers on the other hand, do take up more energy at much lower levels of elongation. As such, they can improve the Mode II interlaminar fracture toughness substantially.