利用增材制造技术生产的具有质量梯度的新型蜂窝结构的建模与表征

IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Luís Aser Portela, Etienne Copin, M Fátima Vaz, Augusto M Deus
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引用次数: 0

摘要

增材制造方法的推广促进了具有高强度重量比的复杂结构的设计和生产。蜂窝材料(如蜂巢)重量轻、吸能能力强,因此非常适合航空航天和汽车行业。本研究包括对金属基常规蜂窝材料和功能分级蜂窝材料的研究和比较。后者包括径向和线性/纵向梯度。研究了三种重复单元格:正六边形、高原型和莲花型。这些结构是用激光粉末床熔融技术在铝中制作的。选定的样品进行了应力消除热处理。采用数值和实验方法评估面内抗压性能。有限元分析用于获得每个结构的模拟力-位移曲线,从而计算出比刚度、吸收能量和屈服强度。实验方法包括对三种类型的规则结构的三个试样进行压缩,分别进行和不进行应力释放热处理。热处理降低了样品的屈服强度和刚度,同时增加了延展性。研究发现,结构的机械性能取决于梯度类型、相对密度和单胞结构的综合影响。结果表明,相对密度的增加会提高特定的机械性能。莲花结构显示出最高的比力学性能,因为其几何形状减少了应力集中。数值结果与实验结果吻合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modelling and characterization of novel honeycomb structures with mass gradient produced by additive manufacturing
The dissemination of additive manufacturing methods has facilitated the design and production of complex structures which have a high strength-to-weight ratio. Cellular materials such as honeycombs have low-weight and high capacity to absorb energy which makes them desirable for the aerospace and automotive industries. The present work covers the study and comparison of metal-based regular honeycombs and functionally graded honeycombs. The latter encompass radial and linear/longitudinal gradients. Three repeating unit cells were studied: regular hexagons, Plateau and lotus. The structures were produced in aluminium using the laser powder bed fusion technique. Selected samples were submitted to a stress-relieving heat treatment. Numerical and experimental methods were used to assess the in-plane compressive properties. Finite element analysis was used to obtain the simulated force–displacement curves of each structure, allowing for the calculation of specific stiffness, absorbed energy and yield strength. The experimental method consisted of the compression of three specimens of three types of regular structures with and without stress-relieving heat treatment. The heat treatment reduced the yield strength and stiffness whilst increasing the ductility of the samples. The mechanical behaviour of the structures was found to depend upon a combined effect of the type of gradient, relative density, and unit cell structure. The results showed that an increase in the relative density would enhance the specific mechanical properties. The lotus configuration displayed the highest specific mechanical properties, as its geometry reduces the stress concentrations. The numerical results showed a reasonable match with the experimental results.
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来源期刊
CiteScore
4.70
自引率
8.30%
发文量
166
审稿时长
3 months
期刊介绍: The Journal of Materials: Design and Applications covers the usage and design of materials for application in an engineering context. The materials covered include metals, ceramics, and composites, as well as engineering polymers. "The Journal of Materials Design and Applications is dedicated to publishing papers of the highest quality, in a timely fashion, covering a variety of important areas in materials technology. The Journal''s publishers have a wealth of publishing expertise and ensure that authors are given exemplary service. Every attention is given to publishing the papers as quickly as possible. The Journal has an excellent international reputation, with a corresponding international Editorial Board from a large number of different materials areas and disciplines advising the Editor." Professor Bill Banks - University of Strathclyde, UK This journal is a member of the Committee on Publication Ethics (COPE).
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