Prior work has demonstrated greater antipathogenic efficacy concerning the nanostructured copper cold spray coatings versus conventional copper cold spray coatings, while both the nanostructured and conventional cold spray coatings maintain greater contact killing/inactivation rates relative to other thermal spray deposition methods. Recent work has more heavily focused upon the nanostructured cold spray coatings greater efficacy. However, the antimicrobial efficacy of conventional copper cold spray coatings may be improved upon by way of identifying processing parameters that yield microstructures with the greatest concentration of atomic copper ion diffusion pathways. Since ideal processing parameters for a given application can be computed in silico via finite element analysis methods, the fundamental computational frameworks for doing so using the Johnson–Cook and Preston–Tonks–Wallace plasticity models. Modeled single-particle impact morphology outputs were compared with experimental microstructures using scanning electron microscopy and optical microscopy. The computed von Mises flow stresses associated with the two plasticity models were compared with traditionally static nanoindentation data as well as dynamic spherical nanoindentation stress–strain curves. Continued work with the finite element analysis framework developed herein will enable the best cold spray parameters to be identified for optimized antimicrobial properties as a function of deformation-mediated microstructures while still maintaining the structural integrity of the deposited material. Subsequent work will extend the finite element analysis models to multi-particle impacts when spray-dried and gas-atomized copper powder particles have been appropriately meshed.

中文翻译：

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用于优化抗菌铜冷喷涂涂层的单粒子冲击的有限元建模

先前的工作已经证明纳米结构铜冷喷涂涂层与传统铜冷喷涂涂层相比具有更大的抗病原体功效，而纳米结构和传统冷喷涂涂层相对于其他热喷涂沉积方法保持更高的接触杀死/灭活率。最近的工作更多地集中在纳米结构冷喷涂涂层的更大功效上。然而，传统铜冷喷涂涂层的抗菌功效可以通过确定产生具有最大浓度原子铜离子扩散路径的微观结构的工艺参数来提高。由于给定应用的理想加工参数可以通过有限元分析方法在计算机中计算，使用 Johnson-Cook 和 Preston-Tonks-Wallace 塑性模型这样做的基本计算框架。使用扫描电子显微镜和光学显微镜将模拟的单粒子冲击形态输出与实验微观结构进行比较。计算出的与两种塑性模型相关的 von Mises 流动应力与传统的静态纳米压痕数据以及动态球形纳米压痕应力-应变曲线进行了比较。继续使用本文开发的有限元分析框架将能够确定最佳冷喷涂参数，以优化抗菌性能，作为变形介导的微观结构的函数，同时仍保持沉积材料的结构完整性。