锻压技术

平方函数曲边负泊松比蜂窝结构面内冲击性能研究

英文标题：Research on in-plane impact performance for negative Poisson′s ratio honeycomb structure with square function curved edge

作者：徐峰祥1 2 管一杰1 2 邹震1 2 刘艳雄1 2 吴磊3 涂繁3

单位：1.武汉理工大学现代汽车零部件技术湖北省重点实验室 2. 武汉理工大学汽车零部件技术湖北省协同创新中心 3. 武汉华夏精冲技术有限公司

关键词：平方函数曲边负泊松比蜂窝结构面内冲击性能动态响应能量吸收

分类号：O347

出版年,卷(期):页码：2022,47(12):212-220

摘要：

在传统内凹六边形蜂窝结构的基础上，提出了一种平方函数曲边的负泊松比蜂窝结构。研究了平方函数曲边系数与其等效泊松比之间的关系，确定了泊松比为负值时平方函数曲边系数的范围。采用有限元方法揭示了冲击速度对平方函数曲边的蜂窝结构变形模式和动态响应的影响规律,并分析了蜂窝结构的能量吸收情况。研究结果表明：引入平方函数曲边的构型具有较为良好的负泊松比效应，并且其等效泊松比与平方函数曲边系数呈一定的线性关系。冲击速度对结构冲击端应力的影响要大于固定端，处于中高速冲击时，平方函数曲边结构的平台区域的震荡幅度也显著增大。同时,该构型还具备优于内六边形构型的吸能特性，随着冲击速度的提高，结构的吸能特性也明显增强。

Based on the traditional concave hexagonal honeycomb structure, a negative Poisson′s ratio honeycomb structure with square function curved edge was proposed. Then, the relationship between square function curved edge coefficient and its equivalent Poisson′s ratio was studied, and when the Poisson′s ratio was negative, the range of square function curved edge coefficient was determined. Furthermore, the influence laws of impact velocity on the deformation mode and the dynamic response of square function curved-edge honeycomb structure were revealed by using the finite element method, and the energy absorption of honeycomb structure was analyzed. The research results show that the configuration of introducing the square function curved edge has a relatively good negative Poisson′s ratio effect, and its equivalent Poisson′s ratio has a certain linear relationship with the coefficient of square function curved edge. The influence of impact velocity on the stress at the impact end of structure is greater than that at the fixed end. When the impact is at medium and high speeds, the vibration amplitude of platform area for the square function curved edge structure also increases significantly. At the same time, this configuration also has better energy absorption characteristics than the inner hexagon configuration. With the increasing of impact velocity, the energy absorption characteristics of the structure are also significantly enhanced.

基金项目：

国家自然科学基金资助项目（51975438）；高等学校学科创新引智计划（B17034）

徐峰祥（1985-），男，博士，副教授 E-mail：xufx@whut.edu.cn 通信作者：刘艳雄（1985-），男，博士，副教授 E-mail： liuyx@whut.edu.cn

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