A crack healable syntactic foam reinforced by 3D printed healing-agent based honeycomb
A crack healable syntactic foam reinforced by 3D printed healing-agent based honeycomb
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DOI：
10.1016/j.compositesb.2018.06.005
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发表时间：
2018-10
期刊：
影响因子：
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通讯作者：
Pengfei Zhang;D. J. Arceneaux;Zhen Liu;Peyman Nikaeen;A. Khattab;Guoqiang Li
中科院分区：
文献类型：
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作者：
Pengfei Zhang;D. J. Arceneaux;Zhen Liu;Peyman Nikaeen;A. Khattab;Guoqiang Li
在这项研究中，一种新的网格骨架（即，3D打印的基于愈合剂的蜂窝结构）嵌入复合泡沫基体中，以使复合材料具有裂纹闭合和愈合能力。在裂纹愈合效率和整体结构性能之间总是存在权衡。本文提出了一种新型网格骨架，使复合泡沫塑料在不牺牲整体力学性能的前提下，具有良好的裂纹愈合能力。复合泡沫基体中玻璃微球的体积分数保持恒定在30%。增强蜂窝单元尺寸以从3.8到5.4和7.3的比率变化，这导致各种物理和机械性能，例如不同的密度和抗压强度。采用差示扫描量热法（DSC）对复合泡沫塑料的热性能进行了测试。复合泡沫基质和PCL网格骨架之间的界面（即，通过傅里叶变换红外光谱（FTIR）对样品进行了表征。这表明这些相之间的相互作用完全是以物理方式进行的。通过纳米压痕试验研究了复合材料构件的力学性能。进行三点弯曲试验以引发结构水平裂纹，以检查裂纹愈合能力。愈合效率是根据裂纹愈合事件前后的比弯曲强度之间的比较获得的。在自由约束条件下，3D打印的PCL蜂窝增强复合泡沫塑料表现出良好的裂纹愈合性能，愈合效率超过80%。该研究提供了对3D打印蜂窝增强复合泡沫系统中的界面特性和裂纹愈合机制的理解。
In this study, a novel grid skeleton (i.e., the 3D printed healing-agent based honeycomb structure) was embedded in a syntactic foam matrix to enable the composites to own crack closing and healing capabilities. There is always a trade-off between crack healing efficiency and overall structural properties. The new type grid skeleton was proposed here to make syntactic foam composites owning excellent crack healing ability without sacrificing overall mechanical properties. The volume fraction of glass microballoons within syntactic foam matrix remained constant at 30%. The reinforcing honeycomb cell sizes varied with a ratio from 3.8, to 5.4 and 7.3, which resulted in various physical and mechanical properties, such as different density and compressive strength. The thermal properties of the syntactic foam composites were tested through Differential Scanning Calorimetry (DSC). The interfaces between the syntactic foam matrix and PCL grid skeleton (i.e., printout) was investigated by the Fourier Transform Infrared (FTIR) spectrum. It displayed that the interaction between those phases were completely in a physical manner. Nano-indentation tests were conducted to study the composite component mechanical properties. Three-point bending tests were conducted to initiate structural level cracks to examine the crack healing capability. Healing efficiency was obtained according to the comparison between specific flexural strength before and after the crack healing event. Under free constraint condition, the 3D printed PCL honeycomb reinforced syntactic foam exhibited promising crack healing performance with healing efficiencies above 80%. This study provided an understanding on the interface property and crack healing mechanisms in the 3D printed honeycomb reinforced syntactic foam system.