Bonding quality and fracture analysis of polyamide 12 parts fabricated by fused deposition modeling
Bonding quality and fracture analysis of polyamide 12 parts fabricated by fused deposition modeling
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熔融沉积建模制造的聚酰胺 12 部件的粘合质量和断裂分析
DOI：
10.1108/rpj-03-2016-0033
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发表时间：
2017-01-01
影响因子：
3.9
通讯作者：
Xu, Gaojie
中科院分区：
文献类型：
--
作者：
Li, Hao;Zhang, Shuai;Xu, Gaojie
目的：通过对半结晶和非晶态树脂印制零件的研究，评价建筑材料的流变性对熔融沉积成型工艺中粘接质量和极限拉伸强度的影响。设计/方法/途径-使用半结晶聚酰胺12和无定形丁二烯苯乙烯(ABS)，通过改变三个重要的工艺参数：材料、液化温度和光栅取向，评估了流变特性对粘接质量和拉伸强度的影响。还对拉伸和冷冻断裂样品的断口进行了研究。结果发现，流变特性，主要是熔体粘度，对熔融长丝的粘接质量有显著影响。与无定形ABS相比，半晶态PA12印刷的FDM件具有更好的粘接质量和更高的拉伸强度，这可能是由于PA12在低剪切速率下熔体粘度较低而导致较高的初始烧结速率所致。通过FDM获得了几乎完全致密的PA12部件。原创性/价值-该项目提供了各种数据和洞察力，以了解材料特性对FDM打印部件的机械性能的影响。结果表明，熔融成形技术可以生产出机械性能良好的PA12零件，克服了以非晶态热塑性塑料为原料生产原型的最大局限性。
Purpose - This work aims to evaluate the influence of rheological properties of building materials on the bonding quality and ultimate tensile strength in the fused deposition modeling (FDM) process, through the investigation of parts printed by semi-crystalline and amorphous resins. Little information is currently available about the influence of the crystalline nature on FDM-printed part quality.Design/methodology/approach - Semi-crystalline polyamide 12 and amorphous acrylonitrile butadiene styrene (ABS) were used to assess the influence of rheological properties on bonding quality and the tensile strength, by varying three important process parameters: materials, liquefier temperature and raster orientation. A fractography of both tensile and freeze-fractured samples was also investigated.Findings - The rheological properties, mainly the melt viscosity, were found to have a significant influence on the bonding quality of fused filaments. Better bonding quality and higher tensile strength of FDM parts printed with semi-crystalline PA12, as compared with amorphous ABS, are suggested to be a result of higher initial sintering rates owing to the lower melt viscosity of PA12 at low shear rates. Near-full dense PA12 parts were obtained by FDM.Originality/value - This project provides a variety of data and insight regarding the effect of materials properties on the mechanical performance of FDM-printed parts. The results showed that FDM technique allows the production of PA12 parts with adequate mechanical performance, overcoming the greatest limitation of a dependence on amorphous thermoplastics as a feedstock for the production of prototypes.