用于4D打印的纤维增强热塑性复合材料的材料表征和精确有限元分析
Material characterization and precise finite element analysis of fiber reinforced thermoplastic composites for 4D printing
摘要：
四维（4D）打印是增材制造（3D打印）中出现的一种新技术，因其能够将制造后的形状变化编程为工件而广为人知。特别是基于熔融沉积建模（FDM）的4D打印，使用热塑性塑料来生产工件，并需要计算分析来辅助复杂几何形状的设计过程。然而，这些人工制品对结构载荷是脆弱的，并且设计质量可能受到不太准确的材料模型和数值模拟的限制。为了解决这些问题，本文提出了一种由两种材料-聚乳酸（PLA）和碳纤维增强PLA（CFPLA）-制成的复合结构设计，以增加4D打印工件的结构强度，以及由几个物理实验和一系列动态力学分析（DMA）组成的工作流程来表征材料。我们将此工作流程应用于使用不同打印参数制造的3D打印样品，以准确表征材料，并实施顺序有限元分析（FEA）以实现准确的模拟。通过几个创新设计实例，计算和实验验证了触发过程引起的变形的准确性，准确性的95%置信区间为（0.972，0.985）。我们相信，所提出的工作流程是必不可少的几何，材料机制和设计的结合，并具有各种潜在的应用。
英文摘要：
Four-dimensional (4D) printing, a new technology emerged from additive manufacturing (3D printing), is widely known for its capability of programming post-fabrication shape-changing into artifacts. Fused deposition modeling (FDM)-based 4D printing, in particular, uses thermoplastics to produce artifacts and requires computational analysis to assist the design processes of complex geometries. However, these artifacts are weak against structural loads, and the design quality can be limited by less accurate material models and numerical simulations. To address these issues, this paper propounds a composite structure design made of two materials - polylactic acid (PLA) and carbon fiber reinforced PLA (CFPLA) - to increase the structural strength of 4D printed artifacts and a workflow composed of several physical experiments and series of dynamic mechanical analysis (DMA) to characterize materials. We apply this workflow to 3D printed samples fabricated with different printed parameters to accurately characterize the materials and implement a sequential finite element analysis (FEA) to achieve accurate simulations. The accuracy of deformation induced by the triggering process is both computationally and experimentally verified with several creative design examples, and the 95% confidence interval of the accuracy is (0.972, 0.985). We believe the presented workflow is essential to the combination of geometry, material mechanism and design, and has various potential applications.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
