The cement-filled PA12 manufactured by selective laser sintering (SLS) offers desirable mechanical properties; however, these properties are dependent on several fabrication parameters. As a result, SLS prototypes may exhibit orthotropic mechanical properties unless properly oriented in build chamber. This paper aims to evaluate the effects of part build orientation, laser energy and cement content on mechanical properties of cement-filled PA12.,The test specimens were fabricated by SLS using the “DTM Sinterstation 2000” system at which the specimens were aligned along six different orientations. The scanning speed was 914mm/s, scan spacing was 0.15mm, layer thickness was 0.1mm and laser power was 4.5–8Watt. A total of 270 tensile specimens, 270 flexural specimens and 135 compression specimens were manufactured and the tensile, compression and flexural properties of fabricated specimens were evaluated.,The experiments revealed orientation-dependent (orthotropic) mechanical properties of SLS cement-filled PA12 and confirmed that the parts with shorter scan vectors have enhanced flexural strength as compared with longer scan vectors. The maximum deviations of ultimate tensile strength, compressive strength and flexural modulus along the six orientations were 32%, 26% and 36%, respectively.,Although part build orientation is a key fabrication parameter, very little was found in open literature with contradictory findings about its effect on mechanical properties of fabricated parts. In this work, the effects of build orientation when combined with other fabrication parameters on the properties of SLS parts were evaluated along six different orientations.

中文翻译：

---

选择性激光烧结制备的水泥填充聚酰胺 12 的正交各向异性特性

通过选择性激光烧结 (SLS) 制造的填充水泥的 PA12 提供了理想的机械性能；然而，这些特性取决于几个制造参数。因此，除非在构建室中正确定向，否则 SLS 原型可能会表现出正交各向异性的机械性能。本文旨在评估部件构建方向、激光能量和水泥含量对填充水泥的 PA12 机械性能的影响。使用“DTM Sinterstation 2000”系统通过 SLS 制造试样，试样沿六个方向对齐。不同的方向。扫描速度为 914mm/s，扫描间距为 0.15mm，层厚为 0.1mm，激光功率为 4.5-8Watt。总共制造了 270 个拉伸试样、270 个弯曲试样和 135 个压缩试样，并且拉伸、对制造的试样的压缩和弯曲性能进行了评估。实验揭示了 SLS 水泥填充 PA12 的取向相关（正交各向异性）机械性能，并证实与较长的扫描矢量相比，具有较短扫描矢量的部件具有更高的弯曲强度。沿六个方向的极限拉伸强度、压缩强度和弯曲模量的最大偏差分别为 32%、26% 和 36%。,虽然零件构建方向是一个关键的制造参数，但在公开文献中发现的很少有相互矛盾的发现关于它对制造零件机械性能的影响。在这项工作中，沿着六个不同的方向评估了构建方向与其他制造参数对 SLS 部件性能的影响。