来自Gheorghe Asachi技术大学, Romania have released a study investigating the mechanical behaviour of 3D printed parts under axial compression. A set of hollow PLA spheres were additively manufactured with varying print parameters before being subjected to a comprehensive mechanical testing regime, revealing the influence of temperature, print speed, and part wall thickness on the mechanical properties of the spheres.
Spherical joints and couplings
Spherical parts are typically found at the intersection points of other components in a mechanical system. This includes bearings which reduce frictional forces between moving parts. It also encapsulates spherical joints, which we might find in a robotic arm, enabling rotational freedom in a number of axes.
这些球形耦合往往是由金属制成的，但该研究的作者有兴趣评估塑料对应用的有用性。特别是，与添加剂制造工艺一起用作制造方法本身可能会对零件的表面粗糙度，表雷电竞充值面层特性和材料同质性产生重大影响。为了更好地了解这种3D打印部分的机械性能，压缩行为和弹性，团队必须工作。
3D printing hollow spheres
A set of nine hollow spherical samples were printed in silver metallic PLA on anUltimaker 2+3D打印机。每个样品都有自己独特的四个打印参数组合：壁厚，打印速度，冷却速度和板温度。在研究人员开始进行任何实际机械测试之前，他们进行了有限的元素分析模拟（一种估计部分中的变形方法）。这为研究人员提供了一些初步数据，然后他们可以将其与以后的实际测量进行比较。
The physical testing of the parts involved crushing them until they plastically deformed and eventually fractured (think液压新闻通道). The forces at each stage of deformation were recorded and compared to the values calculated in the simulations. The researchers found that their simulations were remarkably similar to the actual end results of the experiments, meaning the considerations they formulated when analyzing the deformation conditions were correct.
至于实际结果，打印板温度参数对零件的弹性具有最大的影响。同样，随着部分壁厚的增加，球体的弹性也增加了。该小组希望扩展研究，并在某个时候研究其他因素对轴向压缩下零件行为的影响。
Further details of the study can be found in the paper titled ‘轴向压缩下3D印刷PLA空心球形零件的机械行为’。它由Adelina Hrituc，Andrei Mihalache，Marian Mares，Margareta Coteata，Oana Dodun，Gheorghe Nagit和Laurentiu Slatineanu合着。
There are a great number of factors that can affect the mechanical properties of a material or 3D printed part. Earlier this year, researchers from Greece determined the回收对ABS细丝机械性能的影响. Surprisingly, the mechanical properties were found to improve by about 30% until the fifth stage of recycling, after which they deteriorated. Elsewhere, in Slovakia, researchers have developed a set of new“极强”的混合PETG复合材料用于FFF 3D打印。通过用扩展的石墨和碳纤维增强PETG细丝，该团队能够增强基本PETG材料的机械和热性能。
The nominations for the2020 3D Printing Industry Awards现在开放。您认为谁应该在今年的演出中列出入围名单？现在有发言权。
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特色图显示了有限元分析模拟，描述了球体的预期行为。通过Gatu图像。
