期刊
MATERIALS & DESIGN
卷 168, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2019.107664
关键词
3D printing; Hierarchical lattice; Multi-failure; Mechanical properties
资金
- National Natural Science Foundation of China [11672130, 11802212]
- State Key Laboratory of Mechanics and Control of Mechanical Structures [MCMS-0217G03]
- Nanjing University of Aeronautics and Astronautics Graduate Innovation Fund [kfjj20160106]
Based on general lattice structure, a hierarchical isogrid (isotropic grid) structurewith T-ribswas designed to enhance the buckling resistance and plastic performance, and manufactured by three-dimensional (3D) printing technique. It is proposed that under edgewise compression, the latticed panel has three structural failure modes, including material failure, global buckling and local buckling. Hierarchical topology simultaneously improves the out-of-plane and in-plane rigidity of the lattice ribs, as T-ribs balance the global bending rigidity and the local rib bending rigidity, endowing the panel higher buckling resistance. In the stage of post-failure plastic bending, the T-rib lattice shows good load-carrying ability and deforming ductility. Based on three failure modes, a multi-failure theory was built and verified by experiments and finite element method (FEM). A plastic model for the hierarchical isogrid panels was built to predict the post-failure deformation. The failure mode map method was proposed, providing reference for further optimal design. (c) 2019 Published by Elsevier Ltd.
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