Slager Jonathan J, Earp Brian C, Ibrahim Ahmed M
Department of Mechanical and Nuclear Engineering, United States Naval Academy, Annapolis, MD 21401, USA.
Department of Naval Architecture and Ocean Engineering, United States Naval Academy, Annapolis, MD 21401, USA.
Polymers (Basel). 2024 Aug 7;16(16):2241. doi: 10.3390/polym16162241.
The use of additive manufacturing to rapidly test and evaluate solutions to engineering problems has been demonstrated. Selective laser sintering (SLS) is a subset of additive manufacturing that is particularly well suited to producing structural thin wall models and end use parts which can improve the ability to prototype and manufacture certain designs at a substantially lower cost and time compared to current methods. However, a more comprehensive understanding of the material properties of these parts is warranted. The presented research investigates the influence of print orientation and sample thickness on the material properties of printed SLS parts. This novel work involves holding a hatch pattern constant across SLS prints using polyamide 12 material to isolate the anisotropic effects of orientation and thickness. An evaluation of ultimate tensile strength, modulus of elasticity, strain at failure, yield strength, and Poisson's ratio, and scanning electron microscope fractography are conducted. Transverse strain and Poisson's ratio are a key aspect that provide insight into the feasibility of building numerical orthotropic models. These data are used to calculate the degree of anisotropy due to both thickness and orientation. The results support the future use of SLS printing and modeling of thin-walled structures, such as scaled structural ship modeling. The presented data provide guidance on the impact of print orientation and thickness that will aid in manufacturing structural parts with intentionally tuned material properties.
增材制造用于快速测试和评估工程问题解决方案的用途已得到证实。选择性激光烧结（SLS）是增材制造的一个子集，特别适合生产结构薄壁模型和最终使用部件，与当前方法相比，它能够以显著更低的成本和时间提高某些设计的原型制作和制造能力。然而，有必要对这些部件的材料特性有更全面的了解。所开展的研究调查了打印方向和样品厚度对打印的SLS部件材料特性的影响。这项新颖的工作涉及在使用聚酰胺12材料的SLS打印过程中保持填充图案不变，以分离方向和厚度的各向异性效应。对极限抗拉强度、弹性模量、断裂应变、屈服强度和泊松比进行了评估，并进行了扫描电子显微镜断口分析。横向应变和泊松比是深入了解构建数值正交各向异性模型可行性的一个关键方面。这些数据用于计算由于厚度和方向导致的各向异性程度。结果支持未来将SLS打印用于薄壁结构的建模，例如按比例缩放的结构船舶建模。所呈现的数据为打印方向和厚度的影响提供了指导，这将有助于制造具有经过有意调整的材料特性的结构部件。
