Abstract 3D-printed composites reinforced with continuous carbon fibers have great potential to be adopted in various engineering fields, e.g., urban rail transit and aerospace. However, different manufacturing processes of 3D printing have great impacts on the properties of composites. The optimal material selection to meet given practical engineering demands usually requires that a compromise is struck between conflicting criteria. This paper studies the mechanical properties of a polyamide-based composite combined with short and continuous carbon fibers and establishes a systematic hierarchical structure of multiple criteria for materials selection with the consideration of environmental, economic, social and physical impacts. An integrated multi-criteria decision-making approach that contained the fuzzy best-worst method and fuzzy G-VIKOR method is presented to solve the composite materials selection problem. A front-end thin-walled underframe structure of high-speed train, as an empirical application, is adopted to verify the application of this solution methodology and 6 L-2 is selected as the optimal alternative under this engineering background. Sensitivity analysis, validation and practical implications are conducted in this research. The results confirm that this research provides an effective tool to solve the composite materials selection problem and some reference gist for designers.

中文翻译：

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考虑多标准的3D打印连续碳纤维增强复合材料的材料选择

摘要 连续碳纤维增强的 3D 打印复合材料在城市轨道交通和航空航天等各种工程领域具有巨大的应用潜力。然而，3D打印的不同制造工艺对复合材料的性能有很大影响。满足给定实际工程需求的最佳材料选择通常需要在相互冲突的标准之间做出妥协。本文研究了聚酰胺基复合材料结合短纤维和连续碳纤维的力学性能，并建立了一个系统的、多标准的材料选择层次结构，同时考虑了环境、经济、社会和物理影响。针对复合材料的选择问题，提出了一种包含模糊最佳-最差法和模糊G-VIKOR法的综合多准则决策方法。以高速列车前端薄壁底架结构作为实证应用，验证了该求解方法的应用，在此工程背景下，选择6 L-2作为最优方案。本研究进行了敏感性分析、验证和实际意义。结果证实，本研究为解决复合材料选择问题提供了有效工具，为设计人员提供了一些参考依据。用于验证该解决方案方法的应用，并选择 6 L-2 作为该工程背景下的最佳替代方案。本研究进行了敏感性分析、验证和实际意义。结果证实，本研究为解决复合材料选择问题提供了有效工具，为设计人员提供了一些参考依据。用于验证该解决方案方法的应用，并选择 6 L-2 作为该工程背景下的最佳替代方案。本研究进行了敏感性分析、验证和实际意义。结果证实，本研究为解决复合材料选择问题提供了有效工具，为设计人员提供了一些参考依据。