Stoia Dan Ioan, Linul Emanoil, Marsavina Liviu
Department of Mechanics and Strength of Materials, Politehnica University of Timisoara, 1 Mihai Viteazu Avenue, 300 222 Timisoara, Romania.
Materials (Basel). 2019 Mar 15;12(6):871. doi: 10.3390/ma12060871.
This paper presents a study on the tensile properties of Alumide and polyamide PA2200 standard samples produced by Additive manufacturing (AM) based on selective laser sintering (SLS). Because of the orthogonal trajectories of the laser beam during exposure, different orientations of the samples may lead to different mechanical properties. In order to reveal this process issue, four orientations of the samples in building envelope were investigated. For data reliability, all the other process parameters were constant for each material and every orientation. The tensile tests highlight small differences in elastic properties of the two materials, while significant differences in strength properties and energy absorption were observed. Nevertheless, Young modulus indicates high stiffness of the Alumide comparing to PA2200 samples. The stereo microscopy reveals a brittle fracture site for Alumide and a ductile fracture with longitudinal splitting zones for PA2200. From the orientation point of view, similar properties of samples oriented at 0 and 90 degrees for all investigated mechanical properties were observed. However, tensile strength was less influenced by the sample orientations.
本文介绍了一项关于基于选择性激光烧结（SLS）的增材制造（AM）所生产的Alumide和聚酰胺PA2200标准样品拉伸性能的研究。由于曝光过程中激光束的正交轨迹，样品的不同取向可能导致不同的机械性能。为了揭示这一工艺问题，研究了样品在构建包络中的四种取向。为确保数据可靠性，每种材料和每个取向的所有其他工艺参数均保持恒定。拉伸试验突出了两种材料弹性性能的微小差异，同时观察到强度性能和能量吸收方面的显著差异。然而，与PA2200样品相比，Alumide的杨氏模量表明其具有较高的刚度。立体显微镜显示Alumide的断裂部位为脆性断裂，而PA2200的断裂为带有纵向分裂区的韧性断裂。从取向角度来看，对于所有研究的机械性能，0度和90度取向的样品具有相似的性能。然而，拉伸强度受样品取向的影响较小。
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