Additive manufacturing of two-phase lightweight, stiff and high damping carbon fiber reinforced polymer microlattices
Additive manufacturing of two-phase lightweight, stiff and high damping carbon fiber reinforced polymer microlattices
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DOI：
10.1016/j.addma.2020.101106
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发表时间：
2020-03-01
影响因子：
11
通讯作者：
Zheng (Rayne), Xiaoyu
中科院分区：
文献类型：
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作者：
Xu, Zhenpeng;Ha, Chan Soo;Zheng (Rayne), Xiaoyu
碳纤维增强聚合物（CFRP）复合材料以其高刚度重量比而闻名，因此在航空航天、汽车、国防等几个工程领域引起了极大的兴趣。然而，这种复合材料不适合能量耗散，因为很少或没有塑性变形就会发生破坏。在此，我们提出了一种可扩展的多材料投影微立体光刻工艺，能够生产同时实现高比刚度和阻尼系数的碳纤维增强细胞材料。受两相复合材料刚度损失系数上界的启发，我们设计并增材制造了带有软相结构的CFRP微晶格。实验和分析计算证实了我们的结果，表明仅添加一小部分软相就可以显著增强阻尼性能。所提出的设计和增材制造策略允许优化互斥特性。因此，这些CFRP微晶格获得了与商用CFRP、技术陶瓷和复合材料相当的高比刚度，同时像弹性体一样具有耗散性。
Carbon fiber reinforced polymer (CFRP) composite is known for its high stiffness-to-weight ratio and hence is of great interest in several engineering fields such as aerospace, automotive, defense, etc. However, such a composite is not suitable for energy dissipation as failure occurs with very little or no plastic deformation. Herein, we present an extendable multi-material projection microstereolithography process capable of producing carbonfiber-reinforced cellular materials that achieve simultaneously high specific stiffness and damping coefficient. Inspired by the upper bounds of stiffness-loss coefficient in a two-phase composite, we designed and additively manufactured CFRP microlattices with soft phases architected into selected stiff-phase struts. Our results, confirmed by experimental and analytical calculations, revealed that the damping performance can be significantly enhanced by the addition of only a small fraction of the soft phase. The presented design and additive manufacturing strategy allow for optimizing mutually exclusive properties. As a result, these CFRP microlattices achieved high specific stiffness comparable to commercial CFRP, technical ceramics, and composites, while being dissipative like elastomers.