Morano Chiara, Alfano Marco, Pagnotta Leonardo
Department of Mechanical, Energy and Management Engineering, University of Calabria, 87036 Rende, Italy.
Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada.
Materials (Basel). 2023 Jun 28;16(13):4654. doi: 10.3390/ma16134654.
The use of polymers in the transportation industry represents a great opportunity to meet the growing demand for lightweight structures and to reduce polluting emissions. In this context, additive manufacturing represents a very effective fabrication route for mechanical components with sophisticated geometry that cannot be pursued by conventional methods. However, understanding the mechanical properties of 3D-printed polymers plays a crucial role in the performance and durability of polymer-based products. Polyamide is a commonly used material in 3D printing because of its excellent mechanical properties. However, the layer-by-layer deposition process and ensuing auxiliary steps (e.g., post-processing heating) may affect the microstructure and mechanical properties of 3D-printed nylon with respect to the bulk counterpart. In this work, we explore the effect of displacement rate and heat exposure on the mechanical properties of 3D-printed polyamide (PA12) specimens obtained by selective laser sintering (SLS). Moreover, the thermal characteristics of the powders and sintered material were evaluated using differential scanning calorimetry (DSC). Our results highlight the expected rate dependency of mechanical properties and show that a post-processing heat treatment partly affects mechanical behavior.
在交通运输行业中使用聚合物，为满足对轻质结构日益增长的需求以及减少污染排放提供了巨大机遇。在此背景下，增材制造对于制造具有复杂几何形状的机械部件而言是一种非常有效的制造途径，而传统方法无法实现此类部件的制造。然而，了解3D打印聚合物的机械性能对于聚合物基产品的性能和耐用性起着至关重要的作用。聚酰胺因其优异的机械性能而成为3D打印中常用的材料。然而，逐层沉积过程以及随后的辅助步骤（例如后处理加热）可能会影响3D打印尼龙相对于块状材料的微观结构和机械性能。在这项工作中，我们探究了位移速率和热暴露对通过选择性激光烧结（SLS）获得的3D打印聚酰胺（PA12）试样机械性能的影响。此外，使用差示扫描量热法（DSC）评估了粉末和烧结材料的热特性。我们的结果突出了机械性能预期的速率依赖性，并表明后处理热处理会部分影响机械行为。
