一种负泊松比正弦曲线蜂窝结构的面内冲击动力学分析  

In-plane impact dynamic analysis for a sinusoidal curved honeycomb structure with negative poisson's ratio

作　　者：邓小林[1] 刘旺玉[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广州510640

出　　处：《振动与冲击》2017年第13期103-109,154,共8页Journal of Vibration and Shock

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)

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。A fully parameterized sinusoidal curved honeycomb structure was studied, the software Pro/Engineer was used to build the parameterized model of the honeycomb structure. The finite element model for the honeycomb structure was established using the software ABAQUS. Its in-plane dynamic responses with different amplitudes and cell wall thicknesses under different impact velocities were studied. The results showed that the reaction forces of the honeycomb structure is directly related to its amplitudes and impact velocities ; the smaller the amplitudes and the thicker the cell wall thickness, the more obvious the fluctuations of reaction forces ; the higher the impact velocities, the more obvious the fluctuations of reaction forces; if the honeycomb structure has larger amplitudes, its reaction forces have a good stability under different impact velocities; the honeycomb structure fixed end, s platform stress mainly depends on the cell wall thickness, but independent on impact velocities; with increase in amplitudes, the structure ^ s energy absorption capacity drops; with increase in impact velocities, the structure ’ s energy absorption ability tends to be consistent; its slight dilatancy effect can enhance its energy absorption capacity in plane; compared with the energy absorption ability of aregular hexagonal honeycomb structure, that of a sinusoidal curved honeycomb structure is better.

关 键 词：负泊松比 正弦曲线 蜂窝结构 面内冲击 

分 类 号：O343[理学—固体力学]