A novel, bioinspired, non-Newtonian energy absorption medium for the protection of composite laminates under low velocity impact (LVI)
A novel, bioinspired, non-Newtonian energy absorption medium for the protection of composite laminates under low velocity impact (LVI)
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DOI：
10.1117/12.2615203
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发表时间：
2022-04
期刊：
影响因子：
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通讯作者：
Konstantinos Myronidis;M. Kopeć;M. Meo;F. Pinto
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文献类型：
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作者：
Konstantinos Myronidis;M. Kopeć;M. Meo;F. Pinto
海参，棘皮动物家族的海洋动物成员，将通过快速和可逆地增加其皮肤硬度来对外部刺激作出反应，以保护自己[1-3]。这种机制一直是开发能够提高碳纤维增强聚合物（CFRP）层压板的抗冲击性的保护性智能层的灵感来源。通过利用动态和自主相变，这种新型的非牛顿介质通过响应外部刺激改变其机械性能来作为层压材料表面上的保护层，防止冲击损伤，如分层和微裂纹。在15 J的能量水平下进行低速冲击（LVI）试验，以评估保护性多层涂层的能量吸收特性，并将其与未涂覆的CFRP层压板进行比较。LVI的结果表明，由于嵌入的非牛顿材料的粘性相和橡胶相之间的动态过渡，所提出的智能层能够修改在冲击事件期间能量分布的方式。这些数据进一步证实了超声波C扫描分析表明，平均减少60%的内部损伤的程度相比，碳纤维复合材料层压板。这些结果表明，所提出的介质具有独特的能量吸收特性，从而提供了一个创新的解决方案，保护CFRP层压板在主要承载应用中，他们可能会受到平面外的影响，如在航空航天或铁路组件。
Sea cucumbers, marine animals members of the Echinoderms family, will react to an external stimulus by rapidly and reversibly increasing their skin stiffness in order to protect themselves [1-3]. This mechanism has been the source of inspiration for the development of a protective smart layer able to improve the impact resistance of Carbon Fibre Reinforced Polymer (CFRP) laminates. By exploiting a dynamic and autonomous phase transition, this novel, non-Newtonian medium acts as a protective layer on the surface of a laminate by changing its mechanical properties in response to an external stimulus, preventing impact damage such as delamination and microcracks. Low Velocity Impact (LVI) tests were employed at an energetic level of 15 J, to assess the energy absorption characteristics of the protective multi-layered coatings which were compared to an uncoated CFRP laminate. Results from LVI indicated that the proposed smart layers are able to modify the way the energy is distributed during the impact event, due to a dynamic transition between a viscous and rubbery phase of the embedded non-Newtonian material. These data were further confirmed by ultrasonic C-Scan analyses which showed an average reduction of 60% of the extent of the internal damage in comparison with the CFRPs laminates. These results demonstrate that the proposed medium possess unique energy absorption characteristics, thus providing an innovative solution for the protection of CFRP laminates in primary load-bearing applications where they might be subjected to out-of-plane impacts, such as in aerospace or railways components.