Stress-based tool-path planning methodology for fused filament fabrication
Stress-based tool-path planning methodology for fused filament fabrication
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DOI：
10.1016/j.addma.2019.101020
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发表时间：
2020-03
影响因子：
11
通讯作者：
Lingwei Xia;Sen Lin;G. Ma
中科院分区：
文献类型：
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作者：
Lingwei Xia;Sen Lin;G. Ma
刀具路径规划对熔丝制造（FFF）打印的零件质量有相当大的影响。本研究提出一种基于最大主应力方向的路径生成策略。根据有限元分析（FEA）的组件，刀具路径，这是编程为平行于最大主应力方向的应力计算，构造与深度优先搜索（DFS）方法和连接准则。然后通过连接相邻的刀具路径来消除刀具路径中的断点。采用Dijkstra算法减小了喷嘴跳动距离，缩短了生产时间.通过对不同试件的拉伸试验表明，基于应力路径的模型具有更好的力学性能。分别采用数字图像相关（DIC）方法和扫描电子显微镜（SEM）观察断裂过程和断裂表面。DIC和SEM的相应结果表明，由于纤维的各向异性，不同的路径填充形式表现出不同的破坏模式。计算填充分数，并表明先进路径的沉积质量不受影响。这项工作为改善3D打印产品的机械性能提供了一种综合方法。
Tool-path planning has a considerable impact on the quality of components printed by fused filament fabrication (FFF). This research proposes a path generation strategy based on the orientations of the maximum principal stresses. According to stress calculations from finite element analysis (FEA) of the components, tool-paths, which are programmed as parallel to the maximum principal stress directions, are constructed with the depth-first search (DFS) method and a connection criterion. The breakpoints in the tool-paths are then eliminated by connecting adjacent tool-paths. The Dijkstra algorithm is engaged to reduce the nozzle jump distance and shorten the production time. Stretching tests of different specimens printed with the developed path generation algorithms demonstrate that the model with the stress-based path has better mechanical performance. The digital image correlation (DIC) method and scanning electron microscopy (SEM) are employed to observe the fracture processes and fracture surfaces, respectively. Corresponding results of DIC and SEM reveal that different path filling forms exhibit variable failure patterns because of filament anisotropy. The filling fraction is calculated and indicates that the deposition quality of the advanced path is not compromised. This work provides a synthesis methodology for improving the mechanical performance of 3D printing products.