Soft elasticity optimises dissipation in 3D-printed liquid crystal elastomers.
Soft elasticity optimises dissipation in 3D-printed liquid crystal elastomers.
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DOI：
10.1038/s41467-021-27013-0
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发表时间：
2021-11-18
影响因子：
16.6
通讯作者：
Yakacki CM
中科院分区：
文献类型：
--
作者：
Mistry D;Traugutt NA;Sanborn B;Volpe RH;Chatham LS;Zhou R;Song B;Yu K;Long KN;Yakacki CM
单区液晶弹性体(LCEs)的软弹性对于在恒应力下理想地吸收应变能的冲击吸收应用是很有前途的。传统上，考虑到合成足够大的单域器件是出了名的困难，对LCE的压缩和冲击研究还没有进行。在这里，我们使用直接墨写3D打印来制备体块(>；cm3；)单畴LCE器件，并研究其在80年应变率下的压缩软弹性。在准静态速率下，单畴软弹性LCE耗散了45%的应变能，而对比材料耗散了不到20%的应变能。在应变速率高达3,000 S−1的情况下，我们的软弹性单域液晶显示器始终表现出最接近理想冲击吸振器的性能。跌落测试显示，软弹性可能是一种有效降低撞击严重程度的机制--软弹性LCE提供的GADD严重性指数比可比的各向同性弹性体低40%。最后，我们通过印刷指向矢的取向演示了单畴LCE中的剪裁变形和屈曲行为。单区液晶弹性体(LCEs)的软弹性在冲击吸收方面具有广阔的应用前景，但由于缺乏足够尺寸的单区器件的合成工艺，对LCEs的冲击研究尚未展开。在这里，作者使用直接墨水写入的方法制备了块状单畴LCE器件，并研究了其压缩软弹性。
Soft-elasticity in monodomain liquid crystal elastomers (LCEs) is promising for impact-absorbing applications where strain energy is ideally absorbed at constant stress. Conventionally, compressive and impact studies on LCEs have not been performed given the notorious difficulty synthesizing sufficiently large monodomain devices. Here, we use direct-ink writing 3D printing to fabricate bulk (>cm3) monodomain LCE devices and study their compressive soft-elasticity over 8 decades of strain rate. At quasi-static rates, the monodomain soft-elastic LCE dissipated 45% of strain energy while comparator materials dissipated less than 20%. At strain rates up to 3000 s−1, our soft-elastic monodomain LCE consistently performed closest to an ideal-impact absorber. Drop testing reveals soft-elasticity as a likely mechanism for effectively reducing the severity of impacts – with soft elastic LCEs offering a Gadd Severity Index 40% lower than a comparable isotropic elastomer. Lastly, we demonstrate tailoring deformation and buckling behavior in monodomain LCEs via the printed director orientation. Soft-elasticity in monodomain liquid crystal elastomers (LCEs) is promising for impact-absorbing applications but due to the lack of synthetic procedures which give monodomain devices of sufficient size, impact studies on LCEs have not been performed. Here the authors use direct-ink writing to fabricate bulk monodomain LCE devices and study their compressive soft-elasticity.
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