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[转载]【计算机科学】【2018.07】连续纤维复合材料增材制造的建模与路径规划

已有 196 次阅读 2021-7-9 19:24 |系统分类:科研笔记|文章来源:转载

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本文为土耳其萨班奇大学(作者:Suleman Asif)的硕士论文,共58页。

 

基于材料挤制成型的增材制造技术(AM)是一种先进的制造技术,它通过逐层挤出熔融的热塑性聚合物来制造三维零件。然而,由于该技术生产的零件强度和刚度较低,限制了实际应用价值。提高零件机械性能的方法之一是使用增强的热塑性聚合物和填料,如短切或连续纤维。由此产生的增材制造的连续纤维增强热塑性塑料(CFRTP)复合材料具有优异的机械性能,因此可用于航空航天和汽车工业等高性能应用。

     

本文分为两个部分。第一部分是关于增材制造的连续纤维复合材料力学性能评估的建模。目前,对增材成型CFRTP复合材料力学性能评价的研究都是基于实验结果。因此,确定和优化工艺参数的研究非常有限。在本节中,基于有限元的研究旨在确定工艺参数(如喷嘴直径、层厚、体积和填充率)对增材制造的CFRTP复合材料结构弹性性能的影响。 

 

第二部分提出了一种用于连续纤维复合材料增材制造的连续路径规划算法。现有的路径规划算法在基于材料挤压的过程中使用,如果制造形状复杂,会导致材料沉积的不连续性。此外,它们不能用于连续纤维的复合印刷,因为使用连续纤维作为增强材料需要在整个印刷过程中连续沉积。本文提出了一种新的路径规划算法来生成连续纤维复合材料三维打印的连续沉积路径。该算法已应用于各种复杂几何图形,为设计复杂零件生成连续的沉积路径。本论文的研究可以拓展到含多种增强材料的CFRTP复合材料的增材制造。所开发的连续路径规划算法可以与从建模结果得到的优化工艺参数相结合,生产出高度复杂的复合材料零件,通过为各种工业应用提供轻量化的解决方案,可以取代传统的金属零件和工艺。

 

Material-extrusion based AdditiveManufacturing (AM) is one of the leading (AM) technologies, which producesthree-dimensional (3D) parts by extrusion of molten thermoplastic polymerslayer by layer. However, its applications are limited due to the low strengthand stiffness of the parts produced by this technology. One of the ways toimprove the mechanical properties of the parts is to use a reinforcedthermoplastic polymer with a filler such as chopped or continuous fibers. Theresulting additively manufactured continuous fiber reinforced thermoplastic(CFRTP) composites could have superior mechanical properties and hence can beused in high-performance applications such as for aerospace and automotiveindustries. This thesis is divided into two sections. The first section isrelated to the modeling of additively manufactured continuous fiber compositesfor evaluation of the mechanical properties. The current studies for evaluatingthe mechanical properties of additively manufactured CFRTP composites are basedon experimental results. Therefore, there is very limited study available todetermine and optimize the process parameters. In this section, a finiteelement based study is presented to determine the effect of process parameterssuch as nozzle diameter, layer thickness, volume fraction and infill percentageon elastic properties of additively manufactured CFRTP composite structures.The second section presents the development of a continuous path planningalgorithm for additive manufacturing of continuous fiber composites. Theexisting path planning algorithms used in material extrusion-based processescause discontinuities in the material deposition if complex shapes aremanufactured. Moreover, they cannot be used for continuous fiber compositeprinting, since the use of continuous fiber as a reinforcement requirescontinuous deposition of material throughout the printing process. In thisthesis, a novel path planning algorithm has been developed to generatecontinuous deposition path for 3D printing of continuous fiber composites. Thealgorithm has been implemented for various complex geometries to generatecontinues deposition paths for the designed complex parts. The researchconducted in this thesis can expand to the additive manufacturing of CFRTPcomposites with various reinforcing materials. The developed continuous pathplanning algorithm can be coupled with the optimized process parameters obtainedfrom modeling results to produce highly complex shape functional compositeparts that could replace the conventional metal parts and processes byproviding light-weight solutions for various industrial applications.

 

1.  引言

2. 连续纤维增强热塑性复合材料的增材制造模型

3. 连续纤维复合材料增材制造的连续路径规划

4. 结论与展望

5. 参考文献


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