Design and evaluation of new honeycomb configurations with high in-plane /out-of-plane loading-carrying capacity under impact
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摘要: 针对传统蜂窝共面和异面承载能力差距太大的问题,提出了胞壁弓字形弯折蜂窝、层间组合蜂窝和折叠蜂窝等3种新型蜂窝,建立了新型蜂窝的有限元模型并分析了其变形模式和承载能力。结果表明,在相对密度一致的前提下,与传统正六边形蜂窝相比,这3种新构型蜂窝均缩小了共面和异面方向承载能力的差距。其中胞壁弓字形弯折蜂窝的共面/异面承载比提高了21.3倍;层间组合蜂窝两个共面方向承载能力悬殊,承载能力更强的共面方向与异面的承载比值提高了42倍;折叠蜂窝则提高了21.3倍。研究结果可以为抗多向冲击载荷作用下的蜂窝结构设计提供新思路和参考。Abstract: An aluminum honeycomb is widely used in the field of impact cushioning because of its excellent performance. In order to solve the problem of large difference between the in-plane and out-of-plane load-carrying capacities of traditional honeycombs, three new configurations of honeycombs were proposed as follows: bow-shaped, staggered and folded configurations. The finite element models for these new honeycombs were established, and their deformation modes and load-carrying capacities were analyzed. The results show that under the same relative density, compared with the traditional hexagonal honeycombs, the three new configurations can reduce the difference of load-carrying capacity in in-plane and out-of-plane directions. The average in-plane/out-of-plane (I/O) ratio of loading-carrying capacity of the bow-shaped honeycombs in two coplanar directions increased by 21.3 times. For the staggered honeycomb, the load-carrying capacity of each in-plane direction is of great difference, in which the I/O ratio of the excellent direction is increased by 42 times due to its special structure. For the folded honeycomb, the I/O ratio is increased by 21.3 times on average. The research results can provide a new idea and reference for the design of honeycomb structure under multi-directional impact load.
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Key words:
- honeycomb /
- cell configuration /
- energy absorption /
- in-plane /
- out-of-plane
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表 1 不同构型蜂窝的尺寸
Table 1. The sizes of different honeycombs
蜂窝类型 h/mm l/mm t/mm a/mm x/mm α/(°) γ/(°) 相对密度 质量/g 体积/mm3 胞壁弓字形弯折蜂窝 30 3.43 0.03 10 5 0.02 2.607 50 434 层间组合蜂窝 30 5.2 0.03 0.02 1.112 19 670 折叠蜂窝篇 30 1.73 0.03 75 75 0.02 0.745 13 733 表 2 不同构型蜂窝结构的平台应力
Table 2. Platform stresses for different honeycombs
蜂窝类型 平台应力/MPa Kx Ky 异面 共面x 共面y 六边形蜂窝 1.120 0.020 0.0205 0.018 0.018 弓字形弯折蜂窝 0.760 0.290 0.300 0.381 0.395 层间组合蜂窝 0.419 0.322 0.029 0.768 0.069 折叠蜂窝 0.366 0.200 0.087 0.540 0.240 表 3 不同构型蜂窝结构的质量比吸能
Table 3. Specific mass energy absorptionfor different honeycombs
蜂窝类型 质量比吸能/(J·g−1) Rx Ry 异面 共面x 共面y 六边形蜂窝 15.546 0.273 0.324 0.018 0.021 弓字形弯折蜂窝 12.000 3.920 3.951 0.327 0.329 层间组合蜂窝 5.337 4.071 0.544 0.763 0.102 折叠蜂窝 5.391 2.800 1.371 0.520 0.254 -
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