Abstract

We used Fused Deposition Modeling (FDM) for 3D printing of Polylactic acid (PLA) samples, with variation of the printing infill (20% and 100%). Tribological testing was performed on a nanotribometer, under low loads (5, 10, and 15 mN), with a rotating module (ball-on-flat). We studied the friction and wear of PLA samples in two different positions: along the printing direction and normal to the printed direction. The tribological contacts along the printing direction had lower friction coefficient than the contacts that were normal to the printing direction. Samples with 20% infill produced a significantly higher friction coefficient than those with 100% infill. A higher wear factor was exhibited for a dense structure (100% infill) than for a porous material (20% infill). The load increase showed a slight transitional behavior for all types of contacts. The wear factor was on the order of 10^–3 mm³/(N m) for all tests.

中文翻译：

---

旋转滑动条件下3D打印填充和打印方向对聚乳酸（PLA）摩擦和磨损的影响

摘要

我们使用熔融沉积建模（FDM）进行聚乳酸（PLA）样品的3D打印，打印填充的变化（20％和100％）。摩擦学测试是在纳米摩擦计上，在低负载（5、10和15 mN）下，使用旋转模块（扁球）进行的。我们研究了PLA样品在两个不同位置的摩擦和磨损：沿打印方向和垂直于打印方向。沿印刷方向的摩擦接触具有比垂直于印刷方向的接触低的摩擦系数。填充率为20％的样品的摩擦系数明显高于填充率为100％的样品。致密结构（填充率为100％）比多孔材料（填充率为20％）显示出更高的磨损系数。对于所有类型的触点，负载增加都显示出轻微的过渡行为。磨损系数约为10^–3 mm ³ /（N m）用于所有测试。