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Miao Zhao, Zhendong Li, Jun Wei Chua, Chong Heng Lim, and Xinwei Li, Enhanced energy-absorbing and sound-absorbing capability of functionally graded and helicoidal lattice structures with triply periodic minimal surfaces, Int. J. Miner. Metall. Mater., 30(2023), No. 10, pp.1973-1985. https://dx.doi.org/10.1007/s12613-023-2684-8
Miao Zhao, Zhendong Li, Jun Wei Chua, Chong Heng Lim, and Xinwei Li, Enhanced energy-absorbing and sound-absorbing capability of functionally graded and helicoidal lattice structures with triply periodic minimal surfaces, Int. J. Miner. Metall. Mater., 30(2023), No. 10, pp.1973-1985. https://dx.doi.org/10.1007/s12613-023-2684-8
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增强型功能梯度和螺旋三周期极小曲面点阵结构的吸能和吸声性能

摘要: 点阵结构具有轻质高强的结构性能,同时还兼顾良好的吸能和吸声等功能特性,在工程领域中具有广阔的应用潜力。为了进一步提高点阵结构的吸能和吸声性能,本文基于三周期极小曲面提出了一种功能梯度和螺旋点阵结构的设计方法。在此基础上,采用增材制造技术制备了均匀、螺旋、功能梯度和螺旋与功能梯度结合的四种点阵结构,并系统地研究了点阵结构的变形模式、力学性能、吸能和吸声特性。研究结果表明,螺旋结构减小了点阵单胞内的结构间隙并提高了结构的抗断裂性能,使其承载能力在平台阶段逐渐提高。与均匀结构相比,螺旋结构的平台应力和总能量吸收分别提高了26.9%和21.2%。此外,螺旋结构可降低系统共振频率并提高吸收峰峰值,而功能梯度结构则可以实现吸声系数曲线峰值调控。在1000–6300 Hz的频率范围内,将螺旋与功能梯度结构结合,点阵结构的吸收峰峰值提高了18.6%–30%,吸声系数高于0.6的吸声频带拓宽了55.2%–61.7%。

 

Enhanced energy-absorbing and sound-absorbing capability of functionally graded and helicoidal lattice structures with triply periodic minimal surfaces

Abstract: Lattice structures have drawn much attention in engineering applications due to their lightweight and multi-functional properties. In this work, a mathematical design approach for functionally graded (FG) and helicoidal lattice structures with triply periodic minimal surfaces is proposed. Four types of lattice structures including uniform, helicoidal, FG, and combined FG and helicoidal are fabricated by the additive manufacturing technology. The deformation behaviors, mechanical properties, energy absorption, and acoustic properties of lattice samples are thoroughly investigated. The load-bearing capability of helicoidal lattice samples is gradually improved in the plateau stage, leading to the plateau stress and total energy absorption improved by over 26.9% and 21.2% compared to the uniform sample, respectively. This phenomenon was attributed to the helicoidal design reduces the gap in unit cells and enhances fracture resistance. For acoustic properties, the design of helicoidal reduces the resonance frequency and improves the peak of absorption coefficient, while the FG design mainly influences the peak of absorption coefficient. Across broad range of frequency from 1000 to 6300 Hz, the maximum value of absorption coefficient is improved by 18.6%–30%, and the number of points higher than 0.6 increased by 55.2%–61.7% by combining the FG and helicoidal designs. This study provides a novel strategy to simultaneously improve energy absorption and sound absorption properties by controlling the internal architecture of lattice structures.

 

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