Mechanical behavior of ultralight nickel metamaterial
Mechanical behavior of ultralight nickel metamaterial
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DOI：
10.1063/5.0031806
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发表时间：
2021-02
影响因子：
4
通讯作者：
P. Rajak;A. Nakano;P. Vashishta;R. Kalia
中科院分区：
文献类型：
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作者：
P. Rajak;A. Nakano;P. Vashishta;R. Kalia
采用分子动力学模拟方法研究了由空心镍纳米管和实心镍纳米棒组成的超轻可果美结构对压缩的力学响应。在这两种kagome架构中，在压缩下观察到1 6 [ 112 ]肖克莱部分位错和孪晶形成。由固体纳米棒制成的结构在可果美晶格的节点和梁附近都显示出变形。中空的可果美结构比实心的可果美结构具有更高的屈服点。对于小于11%的应变，中空纳米管结构中的变形主要局限于节点区域。在较高的应变下，变形发生在中空的可果美晶格的所有支柱和节点中。由于这种两阶段变形机制，中空Ni纳米管kagome结构显示出比实心Ni纳米棒kagome结构更小的弯曲和更大的韧性。
The mechanical response of ultralight kagome structures consisting of hollow nickel (Ni) nanotubes and solid Ni nanorods to compression is studied using molecular dynamics simulations. In both kagome architectures, 1 6 [ 112 ] Shockley partial dislocations and twin formation are observed under compression. The structure made from solid nanorods shows deformation near both the nodes and beams of the kagome lattice. The hollow kagome architecture has a higher yield point than the solid kagome structure. The deformation in the hollow nanotube structure is mostly localized in the nodal region for strains less than 11%. At higher strains, the deformation sets in all the struts and nodes of the hollow kagome lattice. Owing to this two-stage deformation mechanism, the hollow Ni nanotube kagome structure shows less bending and greater toughness than the solid Ni nanorod kagome architecture.