基于连续碳纤维3D打印的结构拓扑优化及工艺研究

本文利用3D打印技术制备了“椭圆形跑道”样件来研究不同纤维角度和纤维层分布对样件机械性能的影响，并通过实验考察各种力学测试中样件的断裂模式。然后基于变密度的拓扑优化理论对三点弯曲梁、C形夹和弹架悬臂进行结构拓扑优化，并通过力学性能实验进行验证。结果表明，在所有的测试中都观察到样件具有各向异性的机械性能，其中纤维方向具有最高的强度和刚度，而跨层方向具有较低的强度和刚度。通过有限元分析和压缩试验表明，经过拓扑优化的连续碳纤维3D打印弹架悬臂结构能够经受住极端运行条件的考验。

Structural topology optimization and process research based on continuous carbon fiber 3D printing

In this paper, "elliptical runway" prototypes were prepared by 3D printing technology to study the effects of different fiber angles and fiber layer distributions on the mechanical properties of the prototypes, and the fracture modes in various mechanical tests were tested experimentally. Then, the topology of the three-point bending beam, C-clamp and cartridge cantilever was optimized based on the topology optimization theory of variable density, and verified by mechanical performance tests. The results show that anisotropic mechanical properties are observed in all mechanical tests, in which the fiber direction has the highest strength and stiffness, while the spanwise direction has lower strength and stiffness. The topologically optimized continuous carbon fiber 3D-printed bullet rack cantilever structure can withstand extreme operating conditions through finite element analysis and compression testing.