基于缺陷特征的增材制造样品的断裂位置识别:使用AlSi10Mg的演示

IF 11.1 1区 工程技术 Q1 ENGINEERING, MANUFACTURING
Nancy Huang , Erik T. Furton , Yasham A. Mundada , Allison M. Beese
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引用次数: 0

摘要

提出了一种新的度量方法来量化表面连接缺陷和不同形态的内部孔隙(即不规则的LoF孔和球形小孔)对激光粉末床增材制造AlSi10Mg拉伸试样力学性能和断口位置的影响。由于仅缺陷体积不足以预测断裂位置,所提出的缺陷冲击度量(DIM)纳入了其他缺陷特征的贡献,包括与表面的接近程度、与邻近缺陷的相互作用、形貌和承载横截面积的减少,以更好地评估缺陷与断裂位置对应的倾向性。钥匙孔试样的断裂位置被大量表面连接缺陷捕获,相邻缺陷众多,导致承载区域损失增加。相比之下,LoF样品在具有大的表面连接缺陷或大的内部孔隙的区域破裂,其中许多缺陷靠近,曲率高,投影面积大。通过结合表面粗糙度、缺陷投影面积以及基于距离、体积和结构的缺陷之间的相互作用,所提出的DIM在识别LoF和钥匙孔样品中的断裂位置方面优于现有的基于缺陷的框架。此外,在断裂范围内的最大DIM值与强度和延性的关系比LoF样品的孔隙率或缺陷尺寸更强,这表明DIM在无损评估缺陷对力学行为的影响方面具有潜力。DIM框架在PBF-LB AlSi10Mg和Alloy 718中均具有捕获断裂的能力,证明了其更广泛的适用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Identifying fracture location in additively manufactured samples based on defect characteristics: Demonstration using AlSi10Mg
A new metric was developed to quantify the impact of surface-connected defects and internal pores of different morphologies, namely irregular lack of fusion (LoF) pores and spherical keyhole pores, on the mechanical properties and fracture location of AlSi10Mg tensile samples fabricated using laser powder bed fusion additive manufacturing. As defect volume alone has been shown to be insufficient to predict fracture location, the proposed defect impact metric (DIM) incorporates contributions from additional defect features, including proximity to the surface, interaction with neighboring defects, morphology, and reduction in load-bearing cross-sectional area to better assess a defect’s propensity for corresponding to fracture location. The fracture location of keyhole samples was captured by large surface-connected defects with numerous neighboring defects and resulted in increased losses in load-bearing area. In contrast, LoF samples fractured at regions with either large surface-connected defects or large internal pores with many defects in close proximity, high curvatures, and large projected areas. The proposed DIM outperformed existing defect-based frameworks in identifying fracture locations in both LoF and keyhole samples by incorporating surface roughness, defect projected area, and interactions between defects based on distance, volume, and configuration. Additionally, the maximum DIM value within the fracture range was more strongly correlated to strength and ductility than porosity or defect size for LoF samples, demonstrating the potential of the DIM to non-destructively assess the effects of defects on mechanical behavior. The broader applicability of the DIM framework was demonstrated in its ability to capture fracture in both PBF-LB AlSi10Mg and Alloy 718.
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来源期刊
Additive manufacturing
Additive manufacturing Materials Science-General Materials Science
CiteScore
19.80
自引率
12.70%
发文量
648
审稿时长
35 days
期刊介绍: Additive Manufacturing stands as a peer-reviewed journal dedicated to delivering high-quality research papers and reviews in the field of additive manufacturing, serving both academia and industry leaders. The journal's objective is to recognize the innovative essence of additive manufacturing and its diverse applications, providing a comprehensive overview of current developments and future prospects. The transformative potential of additive manufacturing technologies in product design and manufacturing is poised to disrupt traditional approaches. In response to this paradigm shift, a distinctive and comprehensive publication outlet was essential. Additive Manufacturing fulfills this need, offering a platform for engineers, materials scientists, and practitioners across academia and various industries to document and share innovations in these evolving technologies.
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