中等应变率下纸蜂窝结构的力学性能研究  

Study on Mechanical Properties of Paper Honeycomb Structure at Medium Strain Rates

作　　者：马昊 陈美多 袁良柱 王鹏飞[1] 徐松林[1,2] MA Hao;CHEN Meiduo;YUAN Liangzhu;WANG Pengfei;XU Songlin(CAS Key Laboratory for Mechanical Behavior and Design of Materials,University of Science and Technology of China,Hefei 230027,Anhui,China;The United Laboratory of High-Pressure Physics and Earthquake Science,Institute of Earthquake Science,China Earthquake Administration,Beijing 100036,China)

机构地区：[1]中国科学技术大学,中国科学院材料力学行为和设计重点实验室,安徽合肥230027 [2]中国地震局地震预测研究所高压物理与地震科技联合实验室,北京100036

出　　处：《高压物理学报》2024年第4期100-111,共12页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(11672286,11872361);高压物理与地震科技联合实验室开放基金(2019HPPES01);中央高校基本科研业务费专项资金(WK2480000008)。

摘　　要：应用新研制的中应变率实验装置结合激光干涉测速系统完成了纸蜂窝结构的动态加载实验,研究纸蜂窝结构在中应变率下的力学性能;结合高速摄影和数字图像相关方法,得到纸蜂窝结构的变形过程和动态失效机制,并采用数值方法进一步探究其动态失效机制。结果表明:纸蜂窝结构表现出明显的应变率效应;厚度为2.10 mm的纸蜂窝屈服强度明显低于其他3种尺寸,表现出异常尺寸效应,应力-应变曲线下降段也有较大差异。产生异常尺寸效应的主要原因是,随着试样尺寸的增大,纸蜂窝结构的破坏模式发生了变化。中应变率加载过程中,纸蜂窝结构的失效机制为破坏模式的转变—由面外壁屈曲破坏转变为面内剪切破坏。本研究还利用数值模型分析了胞元宽度的变化对结构力学性能的影响,该研究结果对于薄壁结构的优化设计具有很好的参考意义。Combining the laser interferometry system,using the newly developed experimental device at medium strain rates to conduct the dynamic loading experiment of paper honeycomb structure.The purpose is to study the mechanical properties of paper honeycomb structure at medium strain rates.The deformation process and dynamic failure mechanism of paper honeycomb structure were obtained by high-speed photography and digital image correlation method.Numerical methods were used to further explore the dynamic failure mechanism.The results show that the paper honeycomb structure exhibits obvious strain rate effect.The yield strength of 2.10 mm thick paper honeycomb is obviously lower than the other three sizes,showing abnormal size effect.The descending section of stress-strain curve of 2.10 mm thick paper honeycomb is also different.The main reason for it is that the failure mode of paper honeycomb structure changes with the increase of sample size.The failure mechanism of paper honeycomb structure during the loading process at medium strain rates is the change of two failure modes,namely from out-of-plane buckling to in-plane shear.The effect of cell width on mechanical properties of the structure was analyzed by numerical model.This study is a good reference significance for the optimal design of thin-walled structures.

关 键 词：中等应变率 纸蜂窝 失效机制 面外屈曲 动态响应 

分 类 号：O341[理学—固体力学]