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分布柔度簧片 1

微立体光固化 1

精密增材制造 1

纳米定位 1

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面向精密增材制造的大范围柔性伺服系统

Zhen Zhang, Peng Yan, Guangbo Hao

《工程（英文）》 2017年第3卷第5期页码 708-715 doi: 10.1016/J.ENG.2017.05.020

摘要：

本文主要介绍可用于微立体光固化（MSL）工艺的基于分布柔度簧片的大范围柔性纳米伺服系统的设计、开发和控制。作为这一高精度工艺的使能技术，本文设计了一种兼具毫米级运动行程和纳米级运动精度的紧凑型台式柔性纳米运动系统。由于在运行中无需装配和维护，这种柔性运动系统非常适合苛刻的操作条件。从机械设计的角度来看，镜像对称布局和适当的冗余约束对于抑制寄生运动至关重要。本文对此系统进行了详细的有限元分析（FEA），分析结果表面系统具有满意的机械特征。通过纳米运动系统的动力学模型辨识，本文设计了实时控制策略，并将其应用在一体加工的原型系统中。实验验证了面向MSL 工艺过程的轨迹跟踪性能。所提出的纳米伺服运动系统具有毫米级的工作范围，圆轨迹跟踪误差约为80 nm（均方根值）。

关键词：精密增材制造微立体光固化纳米定位分布柔度簧片

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GO-modified flexible polymer nanocomposites fabricated via 3D stereolithography

Chi Him Alpha Tsang, Adilet Zhakeyev, Dennis Y.C. Leung, Jin Xuan

《化学科学与工程前沿（英文）》 2019年第13卷第4期页码 736-743 doi: 10.1007/s11705-019-1836-x

摘要： Graphene oxide (GO) induced enhancement of elastomer properties showed a great deal of potential in recent years, but it is still limited by the barrier of the complicated synthesis processes. Stereolithography (SLA), used in fabrication of thermosets and very recently in “flexible” polymers with elastomeric properties, presents itself as simple and user-friendly method for integration of GO into elastomers. In this work, it was first time demonstrated that GO loadings can be incorporated into commercial flexible photopolymer resins to successfully fabricate GO/elastomer nanocomposites via readily accessible, consumer-oriented SLA printer. The material properties of the resulting polymer was characterized and tested. The mechanical strength, stiffness, and the elongation of the resulting polymer decreased with the addition of GO. The thermal properties were also adversely affected upon the increase in the GO content based on differential scanning calorimetry and thermogravimetric analysis results. It was proposed that the GO agglomerates within the 3D printed composites, can result in significant change in both mechanical and thermal properties of the resulting nanocomposites. This study demonstrated the possibility for the development of the GO/elastomer nanocomposites after the optimization of the GO/“flexible” photoreactive resin formulation for SLA with suitable annealing process of the composite in future.

关键词： graphene oxide polymer flexible 3D printing stereolithography