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中文核心期刊

金属波纹蜂窝各向异性试验及屈服准则研究

STUDY ON THE ANISOTROPIC TEST AND YIELD CRITERIA OF METAL CORRUGATED HONEYCOMBS

  • 摘要: 蜂窝结构由于具有高比强度、高能量吸收效能和优异抗冲击性能, 在抗冲击缓冲领域具有广泛应用. 相比于传统蜂窝, 波纹蜂窝解决了蜂窝结构异面和共面承载差异巨大、难以实现多方向承载吸能的问题. 本研究制备了新型316L金属波纹蜂窝, 开展了波纹蜂窝不同方向下的压缩试验, 分析了不同方向下波纹蜂窝的变形、承载和吸能特性. 结果表明: 异面不同角度下, 波纹蜂窝的平台应力随着偏转角度的增加, 呈现出先增加后降低的变化趋势, 在30°时平台应力达到最大, 为1.28 MPa, 90°时平台应力最小, 约是30°平台应力的0.38倍. 共面不同角度下波纹蜂窝平台应力基本相同, 表现出各向同性特征. 波纹蜂窝不同方向下的比吸能随角度变化的趋势与平台应力基本相同. 此外, 对比了相同制备工艺和蜂窝参数下的传统蜂窝和波纹蜂窝的承载和吸能特性的差异, 相比传统蜂窝, 波纹蜂窝除在异面0°方向承载和吸能有些降低外, 其他角度下波纹蜂窝的平台力和比吸能都显著大于传统蜂窝, 尤其是在异面90°(共面)方向上, 平台力和比吸能分别是传统蜂窝的23倍和16倍. 最后, 建立了表征波纹蜂窝平台应力的改进Hill 1948各向异性屈服准则, 并通过与试验数据进行对比验证了改进后的屈服准则, 可以较好地表征波纹蜂窝在不同角度下的平台应力.

     

    Abstract: The honeycomb structure, due to its high specific strength, excellent energy absorption efficiency, and superior impact resistance, has broad applications in impact cushioning fields. Compared to traditional honeycombs, the corrugated honeycomb solves the problem of significant load-bearing differences between out-of-plane and in-plane directions that makes it difficult to achieve multi-directional load-bearing and energy absorption. In this study, 316L metallic corrugated honeycombs were fabricated, and compression tests were conducted in different directions to analyze the deformation, load-bearing, and energy absorption characteristics of the corrugated honeycomb in various directions. The results showed that, at different angles of the out-of-plane direction, the platform stress of the corrugated honeycomb exhibited an increasing and then decreasing trend as the deflection angle increased. The maximum platform stress of 1.28 MPa occurred at 30°, while at 90°, the platform stress was minimum, about 0.38 times that at 30°. In the in-plane directions, the platform stress of the corrugated honeycomb was almost constant, displaying isotropic behavior. The trend of specific energy absorption in different directions of the corrugated honeycomb followed the same pattern as the platform stress. Furthermore, a comparison was made between the load-bearing and energy absorption characteristics of traditional honeycombs and corrugated honeycombs under the same fabrication process and honeycomb parameters. The results indicated that, except for the slightly lower load-bearing and energy absorption at the out-of-plane 0° direction, the platform stress and specific energy absorption of the corrugated honeycomb were significantly higher than those of the traditional honeycomb at all other angles, especially in the out-of-plane 90° (in-plane) direction, where the platform stress and specific energy absorption were 23 and 16 times that of the traditional honeycomb, respectively. Finally, an improved Hill 1948 anisotropic yield criterion was established to characterize the platform stress of the corrugated honeycomb, and by comparing with experimental data, it was verified that the improved yield criterion could better represent the platform stress of the corrugated honeycomb at different angles.

     

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