基于晶界强化的多晶体点阵超材料设计与耐撞性研究

doi:10.19562/j.chinasae.qcgc.2024.12.008

Abstract

Abstract:

Lattice mechanical metamaterials are widely applied in various protective structures due to their excellent mechanical properties and crashworthiness. Traditional lattice structures are often composed of periodically arranged regular porous materials. Inspired by the microcrystalline structures of metals， in this paper random grain boundary structures are incorporated into the design of lattice materials， then polycrystal lattice material specimens using 3D printing technology are prepared. Furthermore， crashworthiness studies are conducted based on the finite element models validated by experiments. The results show that compared to single crystal lattice materials， polycrystal lattice materials significantly improve specific energy absorption （SEA） at the same lattice angle， especially with 143% increase at the lattice angle of 30°. The crashworthiness of polycrystal lattice materials is influenced by grain size， intragranular lattice angle， and grain randomness. When grain size decreases， the energy absorption process becomes smoother， but excessively small grains may exacerbate fluctuations in the energy absorption process due to boundary effect. Polycrystal lattice materials with a 45° lattice angle and random lattice angles of 30°/60° exhibit stable energy absorption processes， and those with higher randomness in grain orientations show an even smoother energy absorption process. The novel polycrystal lattice mechanical metamaterials proposed in this paper can effectively enhance the crashworthiness of traditional lattice materials and provide guidance for the design and optimization of new lightweight lattice metamaterials.

Key words: lattice structure, metamaterial, grain boundary strengthening, deformation mode, energy absorption

Geng Luo,Yaozhi Xiao,Kaifeng Xue,Yisong Chen. Study on Design and Crashworthiness of Polycrystal Lattice Metamaterials Based on Grain Boundary Strengthening[J].Automotive Engineering, 2024, 46(12): 2209-2219.

Figures/Tables 20

References 27

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单晶体	EA/J	SEA/（J·g^-1）	多晶体	EA/J	SEA/（J·g^-1）	EA提升/%	SEA提升/%
0°单晶体	65.99	2.444	N12D00R06	153.54	4.695	132.7	92.1
15°单晶体	53.17	2.179	N12D15R06	140.14	4.273	153.6	96.1
30°单晶体	40.52	1.661	N12D30R06	134.02	4.037	230.8	143.1
45°单晶体	43.72	1.792	N12D45R06	124.96	3.798	185.8	112.0

多晶体	EA/J	SEA/（J·g^-1）	CFE	ULC
N06D45R06	117.95	3.585	0.878	0.114
N09D45R06	115.27	3.504	0.881	0.119
N12D45R06	124.96	3.798	0.888	0.090
N15D45R06	125.96	3.829	0.908	0.161

多晶体	EA/J	SEA/（J·g^-1）	CFE	ULC
N12D30/60R06-1	133.37	4.029	0.887	0.107
N12D30/60R06-2	133.72	4.004	0.841	0.135
N12D30/60R06-3	131.02	3.935	0.740	0.116
N12D30/60R06-4	136.20	4.140	0.877	0.134

多晶体	EA/J	SEA/（J·g^-1）	CFE	ULC
N12DrandR06-1	120.49	3.719	0.770	0.146
N12DrandR06-2	164.85	5.057	0.853	0.133
N12DrandR06-3	143.54	4.403	0.772	0.102
N12D30/60R06-1	133.37	4.029	0.887	0.107

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Study on Design and Crashworthiness of Polycrystal Lattice Metamaterials Based on Grain Boundary Strengthening

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