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• W4284691230 endingPage "110916" @default.
• W4284691230 startingPage "110916" @default.
• W4284691230 abstract "• Lattice metamaterial structural optimization method inspired by crystal twinning boundaries. • The theoretical formulae for truss lattices are deduced to guide the optimization design. • A novel multi-scale strategy for lattice structure design to improve stiffness, strength, and toughness simultaneously. Inspired by the strengthening mechanism of crystal twinning boundary, this work proposes a novel strategy for lattice metamaterial design to improve stiffness, strength, and toughness. At the microscale, the inclination variable of unit-cell is introduced into the analytical formula of modulus in the compression direction. Then, the mechanical constitutive model of lattice structure with the inclination variable is established, which can be used to obtain the optimized inclination angle and maximize the stiffness in the compression direction. At the scale of periodic macro-array, to achieve the best mechanical properties in the compression direction without sacrificing the mechanical properties in the horizontal direction, twinning boundaries are introduced into both horizontal and vertical directions of the structure. Additionally, the mechanical properties of the structure can be further improved by controlling the number of twinning boundaries. The models are then fabricated through additive manufacturing and compressed. The experimental and simulation results show that the proposed method can simultaneously improve the stiffness, strength, and toughness of the lattice structure. For example, the stiffness of the optimized SC-BCC lattice structure is improved by 50.82%, the strength by 10.94%, and the energy absorption performance by 20.06% in the compression direction." @default.
• W4284691230 created "2022-07-08" @default.
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• W4284691230 date "2022-09-01" @default.
• W4284691230 modified "2023-10-18" @default.
• W4284691230 title "Crystal-twinning inspired lattice metamaterial for high stiffness, strength, and toughness" @default.
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• W4284691230 doi "https://doi.org/10.1016/j.matdes.2022.110916" @default.
• W4284691230 hasPublicationYear "2022" @default.
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