A design algorithm is presented for finding optimal topologies and alignment profiles of additively manufactured, fiber-reinforced composite structures. A SIMP-like scheme is used to determine where a constrained amount of material is to be located in the design space, while an additional local design variable determines print speed. The local print speed affects fiber alignment based on an experimentally determined relationship, allowing for graded control over effective orthotropy. Material properties are selected from experimental results for additive printed, chopped fiber composites. Two different load cases and three different global print directions are selected for a total of six minimum compliance optimization cases. Results show the design is sensitive to both local fiber control and global print angle selection. A post-processing and manufacturing technique is also introduced for fabricating the optimized structures.

提出了一种设计算法，用于查找增材制造的纤维增强复合结构的最佳拓扑和对齐轮廓。类似于SIMP的方案用于确定在设计空间中材料的受约束位置位于何处，而其他局部设计变量确定打印速度。局部打印速度会根据实验确定的关系影响纤维排列，从而可以有效控制正交性。材料特性是从添加剂印刷的短切纤维复合材料的实验结果中选择的。为总共六个最小合规性优化案例选择了两个不同的负载工况和三​​个不同的全局打印方向。结果表明，该设计对局部光纤控制和全局打印角度选择均敏感。