论文标题
添加性生产金属细胞材料的能量吸收特性的过程参数灵敏度
Process parameter sensitivity of the energy absorbing properties of additively manufactured metallic cellular materials
论文作者
论文摘要
添加剂制造（AM）使得在设计轻巧的抗抗性结构时能够制造金属蜂窝材料。但是，有必要了解：（i）材料结构，（ii）AM过程参数，以及（iii）所产生的几何形状，微结构和能量吸收特性。在这项工作中，我们研究了使用激光粉末融合（LPBF）从316L不锈钢生产的细胞材料的准静态和动态行为。考虑了四个蜂窝结构（八位晶格，晶格壁方形蜂窝，折纸和方形蜂窝）以及三组AM过程参数，其特征在于激光功率为50、125和200W。暴露时间进行了调整以调整以提供相同的总热量输入。 125 W病例导致具有最高强度和延展性的材料。具有此过程变体的细胞材料最匹配其名义密度，并且具有最高的强度和能量吸收。减少（50 W）或增加（200 W），功率会导致孔隙率显着增加，从而降低了强度和能量吸收。但是，我们发现，由于过程诱导的孔隙率而引起的变化的影响要比选择细胞结构而产生的变化更小。
Additive Manufacturing (AM) has enabled the fabrication of metallic cellular materials that are of interest in the design of lightweight impact resistant structures. However, there is a need to understand the interactions between: (i) the material architecture, (ii) the AM process parameters, and (iii) the as-built geometry, microstructure and energy absorbing properties. In this work, we investigate the quasi-static and dynamic behaviour of cellular materials manufactured from 316L stainless steel using laser powder bed fusion (LPBF). Four cellular architectures are considered (octet lattice, lattice-walled square honeycomb, origami and square honeycomb), as well as three sets of AM process parameters, characterised by laser powers of 50, 125 and 200 W. The exposure time is adjusted to deliver the same total heat input. The 125 W case leads to material with the highest strength and ductility. The cellular materials with this process variant match their nominal densities most closely, and have the highest strength and energy absorption. Either reducing (50 W) or increasing (200 W) the power leads to a significant increase in porosity, reducing strength and energy absorption. However, we find that changes due to process-induced porosity have a smaller influence than those resulting from the choice of cellular architecture.
