通过激光粉末床熔融技术制造具有梯度无序晶胞的多孔 Ti-6Al-4 V 合金,增强其能量吸收和机械性能

IF 5.7 1区 工程技术 Q1 ENGINEERING, CIVIL
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引用次数: 0

摘要

增材制造(AM)彻底改变了多孔金属的生产,极大地改善了对其结构特性的控制,并在轻质应用和能量吸收方面提供了前所未有的优势。由于剪切变形和变形机制的原因,在有序和无序多孔结构中平衡能量吸收和抗压强度具有挑战性。本研究探讨了使用激光粉末床熔融(LPBF)制造的具有梯度无序单元的多孔 Ti-6Al-4 V 合金的机械和能量吸收特性。通过准静态压缩实验和有限元模拟,分析了具有不同规则性(R)和不同无序晶胞层的样品的压缩响应。结果表明,引入无序细胞梯度可以防止在具有有序细胞结构的多孔结构中观察到的剪切带的形成,从而显著增强能量吸收。当规则度(R)分别为 0.8、0.4 和 0.2 且有一层或两层无序细胞时,机械性能得到了优化,其特点是抗压强度和能量吸收之间达到了平衡。重要的是,在保持或增强抗压强度的同时,材料的能量吸收能力也能得到大幅提高。具体来说,多孔 Ti-6Al-4 V(R = 0.8,L4)的能量吸收率最高可达 154.9kJ/m³,与普通多孔结构(R = 0 或 L0)相比,能量吸收率大幅提高了约 245.0%,普通多孔结构的能量吸收率仅为 44.9 kJ/m³。与有序和无序多孔结构相比,无序细胞梯度在调整多孔金属的机械性能方面具有巨大潜力,从而推动了它们在航空航天、生物医学和防护领域的应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhanced energy absorption and mechanical properties of porous Ti-6Al-4 V alloys with gradient disordered cells fabricated by laser powder bed fusion
Additive manufacturing (AM) has revolutionized the production of porous metals, greatly improving control over their structural properties and offering unprecedented advantages in lightweight applications and energy absorption. Balancing energy absorption and compressive strength in ordered and disordered porous structures is challenging due to shear deformation and deformation mechanisms. This study investigates the mechanical and energy absorption properties of porous Ti-6Al-4 V alloys with gradient disordered cells fabricated using laser powder bed fusion (LPBF). The compressive response of samples with different regularities (R) and varying layers of disordered cells was analyzed through quasi-static compression experiments and finite element simulations. The results indicate that introducing a disordered cell gradient significantly enhances energy absorption by preventing the formation of shear bands observed in porous structures with ordered cell structures. When the regularity (R) is 0.8, 0.4, and 0.2 with one or two layers of disordered cells, mechanical properties are optimized and characterized by a balance between compressive strength and energy absorption. It is significant that, while preserving or enhancing compressive strength, the energy absorption of the material can be augmented substantially. Specifically, porous Ti-6Al-4 V (R = 0.8, L4) achieves an energy absorption increase of up to 154.9kJ/m³, which represents a dramatic enhancement of approximately 245.0 % over the regular porous structure (R = 0 or L0), which absorbs only 44.9 kJ/m³. Compared to ordered and disordered porous structures, the disordered cell gradient demonstrates significant potential in tuning the mechanical properties of porous metals, thereby advancing their applications in aerospace, biomedical, and protective fields.
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来源期刊
Thin-Walled Structures
Thin-Walled Structures 工程技术-工程:土木
CiteScore
9.60
自引率
20.30%
发文量
801
审稿时长
66 days
期刊介绍: Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.
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