Distribution of rubber particles in the weld zone of fused filament fabricated acrylonitrile butadiene styrene and the impact on weld strength
Distribution of rubber particles in the weld zone of fused filament fabricated acrylonitrile butadiene styrene and the impact on weld strength
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DOI：
10.1016/j.addma.2021.101964
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发表时间：
2021-05-01
影响因子：
11
通讯作者：
Brinson, L. Catherine
中科院分区：
文献类型：
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作者：
Collinson, David W.;Kolluru, Pavan V.;Brinson, L. Catherine
熔丝制造（FFF）是聚合物的常见增材制造方法，由于其低成本和易用性而被广泛采用。然而，由于印刷纤维之间的焊接的弱机械性能，FFF在高性能应用中仍然受到限制，包括用于由丙烯腈丁二烯苯乙烯（ABS）制造的部件。本研究使用原子力显微镜（AFM），以获得高分辨率的纳米力学分布图的丁二烯颗粒周围的焊缝界面在FFF-ABS试样。从定量图像分析，在5？十个？m区域穿过多个焊缝。我们发现，在焊接区内的银纹诱导聚丁二烯颗粒的缺乏促进打印纤维之间的脆性断裂，并导致在降低的焊接强度，通过裤子撕裂实验测量。为了提高FFF-ABS的断裂韧性，可以考虑在印刷期间或之后促进颗粒迁移到焊接区域中的方法。
Fused filament fabrication (FFF) is a common additive manufacturing method for polymers that has been widely adopted due to its low cost and ease of use. However, FFF remains limited in high performance applications due to the weak mechanical properties of the welds between printed fibers, including for parts manufactured from acrylonitrile butadiene styrene (ABS). This study uses atomic force microscopy (AFM) to obtain high resolution nanomechanical maps of the distribution of butadiene particles around weld interfaces in FFF-ABS specimens. From quantitative image analysis, a decrease in the average size and density of the polybutadiene particles is observed within a 5?10 ?m region across multiple welds. We find that the lack of craze-inducing polybutadiene particles within the weld zone promotes brittle fracture between printed fibers and results in a reduced weld strength as measured by trouser tear experiments. To improve the fracture toughness of FFF-ABS, methods to promote particle migration into the weld region during or after printing could be considered.