期刊
ADVANCED ENGINEERING MATERIALS
卷 24, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.202101190
关键词
architected materials; deformation mechanisms; honeycomb microlattice; in situ mechanical characterization; two-photon polymerization
资金
- Florida International University Graduate School
- Engineering Research Centers Program of the National Science Foundation under NSF [EEC-1647837]
High-resolution printing using two-photon polymerization has allowed for the fabrication of accordion-shaped honeycomb lattices with in-plane mechanical anisotropy. The deformation mechanisms and mechanical properties of the lattice in different orientations were investigated using scanning electron microscopy. The accordion-shaped cells exhibited prominent in-plane anisotropy due to their high aspect ratio.
High-resolution printing afforded by two-photon polymerization (2PP) has opened up vast design space, spanning over four orders of magnitude (sub-mu m to cm), unleashing the opportunity to fabricate architected materials with intriguing mechanical characteristics. This study seeks to exploit direct laser writing to print accordion-shaped honeycomb lattices constituted of slender micro-membranes to achieve in-plane mechanical anisotropy. The deformation mechanisms governing orientation-sensitive mechanical properties of the lattice are examined by in situ investigations in a scanning electron microscope. The microlattice displays greater flexibility, compliance, and strain hardening during in-plane compression, whereas it is highly stiff and resistant to fatigue in the out-of-plane orientation. The high aspect ratio of accordion-shaped cells imparts prominent in-plane anisotropy, with longitudinal stiffness twice the transverse stiffness. Folding, interlocking, and compaction of micro-walls are the major deformation mechanisms, inducing brilliant energy dissipation ability, with up to 87% mechanical work-absorption. Digital image correlation analysis reveals that strain re-distribution facilitated by hinges dictates the recoverability of the microlattice. This work provides useful mechanistic insights at the micrometer length scale for tuning the orientation-sensitive mechanical response of mesostructures printed by 2PP.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据