Abstract This study aims to establish the relationships between the process parameters, mesostructural features (interlayer neck and void sizes), and the fracture resistance of 3D printed parts. The proposed method enables the decoupling of bond quality and mesostructure effects on the overall fracture behavior. Double cantilever beam specimens of acrylonitrile butadiene styrene (ABS) were designed, printed, and fracture tested. The apparent fracture resistance (Jc,a), the interlayer fracture resistance (Jc,i), and the microstructure were characterized. The fracture results and the microscopic examinations indicate that Jc,a is strongly correlated with the process parameters through both the interlayer adhesion as well as the mesostructure. Nozzle and bed temperatures and layer height were found to have significant effects on the fracture behavior. For instance, the Jc,a increased by 38% with a 20 °C increase in the nozzle temperature. This originated from 15% increase in the interlayer fracture resistance and 23% increase in the actual fracture surface area (interlayer neck size). The quality of interlayer bond was explained in terms of temperature, pressure, and time of the process. This work quantifies the relationships between the printing process and the fracture behavior and provides novel tools and insights in the design and analysis of printed materials.

中文翻译：

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通过熔体挤出增材制造工艺打印的聚合物的层间粘合性和抗断裂性

摘要 本研究旨在建立 3D 打印部件的工艺参数、细观结构特征（层间颈部和空隙尺寸）与抗断裂性之间的关系。所提出的方法能够将结合质量和细观结构对整体断裂行为的影响解耦。丙烯腈丁二烯苯乙烯 (ABS) 的双悬臂梁试样经过设计、印刷和断裂测试。表征了表观断裂阻力 (Jc,a)、层间断裂阻力 (Jc,i) 和微观结构。断裂结果和显微镜检查表明，Jc,a 通过层间粘附和细观结构与工艺参数密切相关。发现喷嘴和床层温度以及层高对断裂行为有显着影响。例如，Jc,a 随喷嘴温度升高 20 °C 增加 38%。这源于层间断裂阻力增加了 15%，实际断裂表面积（夹层颈尺寸）增加了 23%。层间结合的质量是根据工艺的温度、压力和时间来解释的。这项工作量化了印刷过程与断裂行为之间的关系，并为印刷材料的设计和分析提供了新的工具和见解。和过程的时间。这项工作量化了印刷过程与断裂行为之间的关系，并为印刷材料的设计和分析提供了新的工具和见解。和过程的时间。这项工作量化了印刷过程与断裂行为之间的关系，并为印刷材料的设计和分析提供了新的工具和见解。