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High strain rate response of nanofiber interlayered structural composites

机译：纳米纤维夹层结构复合材料的高应变速率响应

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摘要

Nanofibrous interlayer toughening strategy for laminated composite materials typically demonstrated at quasi-static loading is here evaluated under high strain rate deformation. Carbon fiber reinforced composite laminates of (0/90)(25s) stacking sequence are interlayered by polystyrene-co-glycidyl methacrylate (P(St-co-GMA)) nanofibers which are chemically tuned for interfacial compatibility when embedded in epoxy matrix. The cubical composite specimens are cut and subjected to high strain-rate deformation via Split Hopkinson pressure bar testing. Specimens are hit at their through-the-thickness (stacking) and side-to-side (in-plane) directions. The change in the dissipation of energy due to altered interlaminar microstructure is monitored and reported. Enhancement in the capacity of the energy dissipation due to the nanofibrous interlayers is as high as 80% in-plane and 40% through thickness directions, depending on the strain rate. The results overall suggest that interlayer toughening strategy used in this work prevents the formation of critical matrix cracks that can cause the formation of instantaneous mode II delamination. Incorporation of the nanofibers without causing notable weight penalty effectively toughen the matrix dominant interlaminar zones under high strain rate conditions as well. (C) 2017 Elsevier Ltd. All rights reserved.
机译：叠层复合材料的纳米纤维夹层增韧策略通常在准静态载荷下表现出来，此处是在高应变速率变形下进行评估的。堆叠顺序为（0/90）（25s）的碳纤维增强复合材料层压板由聚苯乙烯-甲基丙烯酸缩水甘油酯（P（St-co-GMA））纳米纤维夹层，该纳米纤维在嵌入环氧树脂基质中时经过化学调节，具有界面相容性。切割立方复合材料样本，并通过Split Hopkinson压力棒测试对其进行高应变率变形。样品在其整个厚度（堆叠）和左右（平面）方向上受到撞击。监测并报告由于层间微结构改变而导致的能量耗散变化。取决于应变率，归因于纳米纤维中间层的能量耗散能力的提高高达平面内的80％和整个厚度方向的40％。总体结果表明，在这项工作中使用的层间增韧策略可防止形成可能导致瞬时II型分层的关键基质裂纹。在不引起显着的重量损失的情况下掺入纳米纤维也有效地在高应变速率条件下增韧了基质占优势的层间区域。 （C）2017 Elsevier Ltd.保留所有权利。

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