3D printed components with ultrasonically arranged microscale structure
3D printed components with ultrasonically arranged microscale structure
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DOI：
10.1088/0964-1726/25/2/02lt01
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发表时间：
2016-02-01
影响因子：
4.1
通讯作者：
Trask, Richard S.
中科院分区：
文献类型：
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作者：
Llewellyn-Jones, Thomas M.;Drinkwater, Bruce W.;Trask, Richard S.
本文展示了3D打印聚合物复合材料结构中不连续纤维结构的原位操作的首次应用。目前，快速成型方法（熔丝制造、立体光刻）在工程领域越来越受欢迎，用于制造结构部件。不幸的是，这些部件的全部潜力受到所用材料的机械性能的限制。本研究的目的是创建并演示一种新方法，在选择性固化的光固化树脂系统中，使用超声波力将纤维对准所需的3D结构，从而即时定向微尺度玻璃纤维。为了实现这一目标，我们在三轴3D打印平台的支架上安装了一个可切换的聚焦激光模块，该模块位于内部超声波校准装置的上方，该装置包含光固化树脂和不连续的14 μ m直径玻璃纤维增强物（50 μ m长度）的混合物。在我们的研究中，合适的打印速度为20 mm s(-1)，这与传统的添加层技术相当。我们展示了构建平面内垂直排列的并排打印部分的能力，其中配置的精确方向是通过在打印中切换超声波驻波剖面来控制的。这种方法允许在3D打印景观中实现复杂的纤维结构。超声波操作技术的通用性也允许广泛的颗粒类型（直径，纵横比和功能）和结构（面内和面外）进行图图化，从而创建新一代用于3D打印的纤维增强复合材料。
This paper shows the first application of in situ manipulation of discontinuous fibrous structure mid-print, within a 3D printed polymeric composite architecture. Currently, rapid prototyping methods (fused filament fabrication, stereolithography) are gaining increasing popularity within the engineering commnity to build structural components. Unfortunately, the full potential of these components is limited by the mechanical properties of the materials used. The aim of this study is to create and demonstrate a novel method to instantaneously orient micro-scale glass fibres within a selectively cured photocurable resin system, using ultrasonic forces to align the fibres in the desired 3D architecture. To achieve this we have mounted a switchable, focused laser module on the carriage of a three-axis 3D printing stage, above an in-house ultrasonic alignment rig containing a mixture of photocurable resin and discontinuous 14 mu m diameter glass fibre reinforcement(50 mu m length). In our study, a suitable print speed of 20 mm s(-1) was used, which is comparable to conventional additive layer techniques. We show the ability to construct in-plane orthogonally aligned sections printed side by side, where the precise orientation of the configurations is controlled by switching the ultrasonic standing wave profile mid-print. This approach permits the realisation of complex fibrous architectures within a 3D printed landscape. The versatile nature of the ultrasonic manipulation technique also permits a wide range of particle types (diameters, aspect ratios and functions) and architectures (in-plane, and out-plane) to be patterned, leading to the creation of a new generation of fibrous reinforced composites for 3D printing.