This work investigates the fatigue performance of AlSi10Mg-based architected materials fabricated using hybrid manufacturing and powder bed fusion (PBF) methods. For the analysis, cellular materials with triply periodic minimal surface (TPMS) topologies, including Gyroid and IWP architectures are manufactured and subject to load-controlled, compression-compression, cyclic loading. Quantitative fatigue performance comparisons of hybrid manufactured (cast) with PBF as-built (PBF-AB) and heat-treated (PBF-HT) samples are performed. Cast samples exhibit the highest fatigue rigidity, and resistance to permanent deformation and fatigue damage, followed by PBF-HT samples, with PBF-AB samples yielding the shortest fatigue life. Gyroid 30 % samples consistently outperform Gyroid 20 % and IWP 30 % designs. The dependence of the fatigue performance of PBF-HT samples on the loading frequency and directionality are investigated, with lower loading frequencies and out-of-building plane loads resulting in a significant accumulation of fatigue ratcheting and fatigue damage strains, respectively. The post-fatigue analysis of the quasi-static stress–strain behavior confirms that cast samples maintain high structural integrity, and a low degradation of mechanical properties over a large number of loading cycles. The analysis provides benchmark results on the process-structure-property relationship of advanced AlSi10Mg materials as a function of their manufacturing method and cyclic loading performance.

中文翻译：

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通过混合和粉末床熔融方法制造的基于 TPMS 的 AlSi10Mg 架构多孔材料的疲劳性能


这项工作研究了使用混合制造和粉末床熔融 （PBF） 方法制造的基于 AlSi10Mg 的建筑材料的疲劳性能。为了进行分析，制造了具有三重周期最小表面 （TPMS） 拓扑结构（包括 Gyroid 和 IWP 架构）的蜂窝材料，并承受负载控制、压缩压缩、循环负载。对混合制造（铸造）与 PBF 竣工 （PBF-AB） 和热处理 （PBF-HT） 样品进行了定量疲劳性能比较。铸造样品表现出最高的疲劳刚度，以及对永久变形和疲劳损伤的抵抗力，其次是 PBF-HT 样品，PBF-AB 样品的疲劳寿命最短。Gyroid 30 % 样品的性能始终优于 Gyroid 20 % 和 IWP 30 % 设计。研究了 PBF-HT 样品疲劳性能对加载频率和方向性的依赖性，较低的加载频率和建筑物外平面载荷分别导致疲劳棘轮和疲劳损伤应变的显着积累。准静态应力-应变行为的疲劳后分析证实，铸造样品在大量加载循环中保持了较高的结构完整性和较低的机械性能退化。该分析提供了先进 AlSi10Mg 材料的工艺-结构-性能关系的基准结果，作为其制造方法和循环加载性能的函数。