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基于投影的模拟方法用于机器人3D打印大型聚合物复合结构.

Yuen Xia1, Kil-Sung Lee2, Sung Kyu Ha1

  • 1Department of Mechanical Engineering, Hanyang University, 222 Wangsimri-ro, Seonjong, Seoul 04763, Republic of Korea.

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概括

本研究提出了一种新方法,通过将纤维方向映射到有限元模型中,准确预测结沉积建模 (FDM) 打印复合材料的结构行为. 该方法提高了在增材制造中使用的异型材料的模拟精度.

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材料属性的表征材料属性的表征.化沉积模型 (FDM) 的使用大型结构3D打印3D打印投影方法 投影方法短纤维增强聚合物复合材料短纤维增强聚合物复合材料

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科学领域:

  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程
  • 增材制造 增材制造 增材制造

背景情况:

  • 复合材料的增材制造 (AM) 正在迅速发展.
  • 准确的结构行为预测AM部件至关重要.
  • 现有的有限元素方法 (FEM) 往往过于简化了印刷路径中的材料异构性.

研究的目的:

  • 开发一种基于投影的方法,用于将工具路径定义的光纤方向映射到FEM.
  • 准确地表示FDM打印复合材料的异型机械行为.
  • 通过模拟大规模打印结构来验证该方法.

主要方法:

  • 碳纤维增强的ABS在多个方向上的机械性能 (弹性模块,抗拉强度) 的实验性表征.
  • 开发基于投影的方法,将光纤定向数据集成到FEM中.
  • 使用20米长的打印船体结构实施和验证FEM模型.

主要成果:

  • 实验数据证实了机械性质的强烈异构性 (弹性模 3.2-9.8 GPa,拉伸强度 20-81 MPa).
  • 剪切模量和强度是从轴外测试 (1.17 GPa和10.9 MPa) 中确定的.
  • FE模型对中跨度偏移的预测显示,与实验结果 (2.19 mm与2.08 mm) 有5%的差异.

结论:

  • 提出的基于投影的方法准确地模拟了FDM打印复合材料的结构行为.
  • 该方法有效地捕捉了对AM部件至关重要的材料异构性.
  • 虽然它面临着高度不规则几何学的挑战,但它为准确的复合模拟提供了一个可扩展的解决方案.