Vat photopolymerization of fly-like, complex micro-architectures with dissolvable supports
Vat photopolymerization of fly-like, complex micro-architectures with dissolvable supports
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DOI：
10.1016/j.addma.2021.102321
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发表时间：
2021-09
影响因子：
11
通讯作者：
Zhenpeng Xu;Ryan Hensleigh;N. J. Gerard;Huachen Cui;M. Oudich;Wentao Chen;Yun Jing;X. Zheng
中科院分区：
文献类型：
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作者：
Zhenpeng Xu;Ryan Hensleigh;N. J. Gerard;Huachen Cui;M. Oudich;Wentao Chen;Yun Jing;X. Zheng
在复杂几何形状的加法制造方面的最新进展使机械超材料的产生成为可能，其奇异特性是基于对复杂单元几何形状的局部控制。在以前的建筑体积中，缺乏连续支撑层的悬垂和自由悬挂特征不能直接制造，这施加了主要的设计限制。由此产生的超材料限于单一的同质结构材料，以及固有的自支撑几何结构，导致可实现的建筑的限制。实现任意特征是很有吸引力的，但本质上受到工艺和材料支持约束的限制。在这里，我们提出了一种新的基于光的添加剂制造方法，能够印刷由大量内部悬挂特征、大跨度悬臂和高深宽比支柱组成的任意微结构。这种方法消除了手动拆卸内部支架的需要，并实现了一套具有一系列设计特性的多功能超材料，包括低频弹性波的宽带隙、可切换的波传输以及无需拆卸支架后的产品。我们描述了各种超材料的合成和快速打印，包括广泛的悬浮特征阵列，并展示了它们的超材料行为。该方法消除了尺度和单元格的限制，能够实现跨多种材料的嵌入特征。
Recent advances in additive manufacturing of complex geometries enabled the creation of mechanical metamaterials whose exotic properties are based on local control of complex cell geometries. Overhanging and free-hanging features that lack continuous support layers in the previous build volume cannot be directly manufactured, imposing a major design limitation. The resulting metamaterials are limited to single homogenous structural materials, and inherently self-supporting geometries, resulting in constraints of achievable architectures. Realizing arbitrary features is compelling but is inherently limited by process and material support constraints. Here we present a novel light-based additive manufacturing approach capable of printing arbitrary micro-architectures comprising a large array of internally suspended features, large span overhang, and high aspect ratio struts. This method eliminates the need for manual removal of internal supports and enables a suite of multi-functional metamaterials with a range of designed properties, including wide bandgaps for elastic waves at low frequency, switchable wave transmissions, and products requiring no post support removal. We describe the synthesis and rapid printing of a variety of metamaterials comprising an extensive array of suspended features and demonstrate their metamaterial behaviors. The proposed approach removes scale and unit cell limitations and is capable of achieving embedded features across multiple materials.