Buckling and Post-Buckling Behavior of Uniform and Variable-Density Lattice Columns Fabricated Using Additive Manufacturing

被引:47
作者
Nazir, Aamer [1 ,2 ]
Bin Arshad, Ahmad [1 ,2 ]
Jeng, Jeng-Ywan [1 ,2 ]
机构
[1] Natl Taiwan Univ Sci & Technol, High Speed 3D Printing Res Ctr, 43,Sect 4,Keelung Rd, Taipei 106, Taiwan
[2] Natl Taiwan Univ Sci & Technol, Dept Mech Engn, 43,Sect 4,Keelung Rd, Taipei 106, Taiwan
关键词
additive manufacturing; lattice structure; design and optimization; unit cell morphology; critical buckling load; variable density; MECHANICAL PERFORMANCE; TRUSS; DESIGN; FOAMS; METAL; SOFT;
D O I
10.3390/ma12213539
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Lattice structures are known for their high strength-to-weight ratio, multiple functionalities, lightweight, stiffness, and energy absorption capabilities and potential applications in aerospace, automobile, and biomedical industry. To reveal the buckling (global and local) and post-buckling behavior of different lattice morphologies, both experimental and simulation-based studies were carried out. Additionally, a variable-density lattice structure was designed and analyzed to achieve the optimal value of critical buckling load. Latticed columns were fabricated using polyamide 12 material on multi jet fusion 3D printer. The results exhibited that the buckling in lattice columns depends on the distribution of mass, second moment of inertia I, diameter and position of vertical beams, number of horizontal or inclined beams, and location and angle of the beams that support the vertical beams. The number of horizontal and inclined beams and their thickness has an inverse relation with buckling; however, this trend changes after approaching a critical point. It is revealed that vertical beams are more crucial for buckling case, when compared with horizontal or inclined beams; however, material distribution in inclined or horizontal orientation is also critical because they provide support to vertical beams to behave as a single body to bear the buckling load. The results also revealed that the critical buckling load could be increased by designing variable density cellular columns in which the beams at the outer edges of the column are thicker compared with inner beams. However, post-buckling behavior of variable density structures is brittle and local when compared with uniform density lattice structures.
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页数:15
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