Local mechanical properties of thin parts produced by additive manufacturing

通过粉末床选择性激光熔融（LPBF）进行的增材制造（AM）将通过制造具有传感器和最大拓扑优化的零件来增加其工业增长。拓扑优化的一个常见结果是在设计中包含薄壁（壁，杆）。在其制造过程中，这些部分具有不同的热演化，引起不同的微观结构，从而产生不同的机械响应。因此，为了最大限度地提高设计质量，必须测量AM制造的零件中这些截面的实际机械性能。因此，AP&C加入了Brochu教授的团队，建立了一个研究项目，旨在研究LPBF制造零件的薄样品的机械性能。Brochu教授团队开发的此类样品的机械评估方案将用于AP&C制造的热交换器部件和网状结构。该项目将有可能获得这些截面的机械拉伸和疲劳强度的真实值。这些结果的重要性对于AP&C至关重要，首先是为了更好地了解小样本测试的模式和特殊性。第二个好处是能够将这些结果用作设计限制，这将允许为增材制造提供更精确的设计工具。

Additive manufacturing (AM) by selective laser fusion on powder bed (LPBF) will increase its industrial growth with the manufacturing of parts that have sensors and maximum topological optimization. A frequent result of topological optimization is the inclusion of thin sections (walls, rods) in the designs. During their manufacturing, these sections have a different thermal evolution, inducing different microstructures which consequently will produce different mechanical responses. It is therefore essential to measure the actual mechanical properties of such sections in parts made by AM, in order to maximize the quality of the design.As a result, AP&C joined the team of Prof. Brochu for the establishment of a research project aimed at studying the mechanical properties of thin samples from parts made by LPBF. The protocols for the mechanical evaluation of such samples developed by the team of Prof. Brochu will be used on heat exchanger sections and mesh structures manufactured by AP&C. This project will make it possible to obtain true values of mechanical tensile and fatigue strength of these sections.The importance of these results is critical for AP&C, firstly to better understand the modalities and particularities of testing on small sample sizes. The second benefit will be to be able to use these results as a design limit, which will allow to have more precise design tools for additive manufacturing.