Thermal modeling of material deposition in melt extrusion 3D printing of fiber reinforced polymer composites

该项目旨在启动英属哥伦比亚大学（UBC）和慕尼黑工业大学（TUM）之间的国际研究合作，涉及纤维增强热塑性复合材料模具的大规模熔融挤出增材制造（AM或3D打印）的应用。在3D打印中，在高温下沉积挤出物，然后快速冷却以加强凝固，导致热梯度，随后在打印部件中产生应力；这些应力可能导致制造缺陷，如打印件翘曲或开裂。对熔融挤出添加剂制造复合材料的传热有很好的理解，有助于重复和一致地再现高质量的印刷。为了释放复合材料增材制造所提供的全部价值，需要数值模拟工具来预测和减轻3D打印部件的制造缺陷。UBC与TUM的探索性合作旨在开发一种瞬态传热有限元模型，以研究3D打印复合材料的温度演变，该模型需要评估打印中的应力、粘合质量和尺寸公差。

This project is to initiate an international research collaboration between the University of British Columbia (UBC) and the Technical University of Munich (TUM), regarding the application of large-scale, melt extrusion additive manufacturing (AM, or 3D printing) of fiber reinforced thermoplastic composite tooling. In 3D printing, deposition of the extrudate at high temperature followed by quick cooling to enforce solidification results in thermal gradients and, subsequently, stresses in a printed part; these stresses may cause manufacturing defects such as warpage or cracking in a printed part. A good understanding of the heat transfer in melt extrusion additive manufactured composites is instrumental for repetitive and consistently reproducible, high-quality printing. To unlock the full value that composite additive manufacturing has to offer, numerical simulation tools are needed to predict and mitigate the manufacturing defects in 3D printed parts. This exploratory UBC/TUM collaboration is to develop a transient heat transfer finite element model to study the temperature evolution in 3D printed composite material, which is required to evaluate the stresses, quality of bonding, and dimensional tolerance in the print.