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Optimization and Quality Evaluation of the Interlayer Bonding Performance of Additively Manufactured Polymer Structures

机译：加成聚合物结构层间粘结性能的优化与质量评价

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The application of additive manufacturing changes from prototypes to series production. In order to fulfill all requirements of series production, the process and the material characteristics must be known. The machine operator of additive manufacturing systems is both a component and a material producer. Nevertheless, there is no standardized procedure for the manufacturing or testing of such materials. This includes the high degree of anisotropy of additively manufactured polymers via material extrusion. The interlayer bonding performance between two layers in the manufacturing direction z is the obvious weakness that needs to be improved. By optimizing this interlayer contact zone, the overall performance of the additively manufactured polymer is increased. This was achieved by process modification with an infrared preheating system (IPS) to keep the temperature of the interlayer contact zone above the glass transition temperature during the manufacturing process. Combining destructive and non-destructive testing methods, the process modification IPS was determined and evaluated by a systematic approach for characterizing the interlayer bonding performance. Thereby, tensile tests under quasi-static and cyclic loading were carried out on short carbon fiber-reinforced polyamide (SCFRP). In addition, micro-computed tomography and microscopic investigations were used to determine the process quality. The IPS increases the ultimate interlayer tensile strength by approx. 15% and shows a tendency to significantly improved the fatigue properties. Simultaneously, the analysis of the micro-computed tomography data shows a homogenization of the void distribution by using the IPS.
机译：增材制造的应用从原型变为批量生产。为了满足批量生产的所有要求，必须知道过程和材料特性。增材制造系统的机器操作员既是组件生产商，又是材料生产商。然而，尚无用于制造或测试此类材料的标准化程序。这包括通过材料挤压使增材制造的聚合物具有高度的各向异性。在制造方向z上，两层之间的层间粘合性能是明显的缺点，需要改进。通过优化该层间接触区，可以增加添加剂制造的聚合物的整体性能。这是通过使用红外预热系统（IPS）进行工艺修改来实现的，以在制造过程中将层间接触区的温度保持在玻璃化转变温度以上。结合破坏性和非破坏性测试方法，通过系统化的方法来确定和评估工艺修改IPS，以表征层间粘合性能。因此，对短碳纤维增强聚酰胺（SCFRP）进行了准静态和循环载荷下的拉伸试验。此外，使用微计算机断层扫描和显微镜检查来确定过程质量。 IPS将最终的层间抗拉强度提高了约5％。 15％，并显示出明显改善疲劳性能的趋势。同时，对微型计算机断层扫描数据的分析表明，使用IPS可以使空隙分布均匀化。

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