一种负泊松比正弦曲线蜂窝结构的面内冲击动力学分析

发布时间：2018-11-21 14:44

【摘要】：研究了一种全参数化的正弦曲线蜂窝结构,通过Pro/Engineer构建了其参数化模型,采用ABAQUS建立了正弦曲线蜂窝结构的有限元模型。研究了不同振幅、不同胞壁厚度的正弦曲线蜂窝结构在不同冲击速度下的面内动力学响应。研究表明,正弦曲线蜂窝结构的反作用力波动情况与其振幅以及冲击速度直接相关。振幅越小、蜂窝结构胞壁越厚,其反作用力波动越明显。速度越高,蜂窝结构的反作用力波动越明显。而振幅较大的正弦曲线蜂窝结构,在不同的速度下,其反作用力表现出了较好的稳定性。正弦曲线蜂窝结构固定端的平台应力主要与其厚度有直接关系,与冲击速度无关。通过对正弦曲线蜂窝结构的能量吸收情况分析表明,随着振幅的增加,其能量吸收能力相对下降,随着速度的提高,蜂窝结构能量吸收能力趋向于一致。结果表明,正弦曲线蜂窝结构的轻微拉胀效应可增强其平面内能量吸收能力,相对普通的常规正六边形蜂窝结构,具有更好的能量吸收效果。
[Abstract]:A fully parameterized sinusoidal honeycomb structure is studied. The parameterized model is constructed by Pro/Engineer and the finite element model of sinusoidal honeycomb structure is established by ABAQUS. The in-plane dynamic responses of sinusoidal honeycomb structures with different amplitudes and thickness of nonsib walls under different impact velocities are studied. It is shown that the fluctuation of reaction force is directly related to the amplitude and impact velocity of sinusoidal honeycomb structure. The smaller the amplitude is, the thicker the cell wall of honeycomb is, the more obvious the fluctuation of reaction force is. The higher the velocity, the more obvious the fluctuation of the reaction force of honeycomb structure. The reaction force of sinusoidal honeycomb structure with larger amplitude shows good stability at different velocities. The platform stress at the fixed end of sinusoidal honeycomb structure is mainly related to its thickness and has nothing to do with the impact velocity. The analysis of the energy absorption of sinusoidal honeycomb structure shows that with the increase of amplitude, the energy absorption capacity of honeycomb structure decreases relatively, and the energy absorption capacity of honeycomb structure tends to be consistent with the increase of velocity. The results show that the slight dilatancy effect of sinusoidal honeycomb structure can enhance its in-plane energy absorption ability, and it has better energy absorption effect than the normal hexagonal honeycomb structure.
【作者单位】：华南理工大学机械与汽车工程学院;
【基金】：广东省自然科学基金(2014A030313251) 广西自然科学基金(2014JJBA60066;2016JJA110045) 广西高校中青年教师基础能力提升项目(KY2016YB437)
【分类号】：O347

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