Additively-manufactured anisotropic and isotropic 3D plate-lattice materials for enhanced mechanical performance: Simulations & experiments. (15th October 2020)

• Record Type: Journal Article
• Authors: Duan, Shengyu; Wen, Weibin; Fang, Daining
• Is Part Of: Acta materialia. Volume 199(2020)
• Page Start: 397
• Page End: 412
• Publication Date: 2020-10-15
• Subjects: Mechanical metamaterials -- Architected materials -- Plate-lattices -- Mechanical properties -- Energy absorption; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2020.08.063
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: Plate-lattices are an emerging category of mechanical metamaterials with exceptional mechanical performance. In this paper, a family of half-open-cell plate-lattices is innovated with exceptional mechanical properties and additive manufacturability. The elastoplastic properties and large strain response of the novel plate-lattices are investigated both numerically and experimentally. Design maps for tailoring the anisotropic index reveal that elastically isotropic plate-lattices can be obtained for a wide range of relative densities. Numerical results reveal that the isotropic plate-lattices exhibit significantly higher elastic properties than other competing topologies such as conventional truss-lattices and isotropic smooth shell-lattices, and their bulk modulus can attain the Hashin-Shtrikman upper bound for all relative densities. Large strain simulations demonstrate the remarkable energy absorption capacity of the novel plate-lattices. The numerical findings are confirmed through the compression experiments on the anisotropic and isotropic stainless steel 316 L specimens manufactured by selective laser melting. This work proposes a novel type of plate-lattices with both exceptional mechanical performance and good additive manufacturability, which opens a new channel for the design of lightweight mechanical metamaterials. Graphical abstract: Image, graphical abstract