剪切增稠液填充蜂窝夹芯板的低速冲击响应  

Low-velocity impact responses of shear-thickening fluid-filled honeycomb sandwich structures

作　　者：李雨薇 易昶成 刘志芳 雷建银 李世强 LI Yuwei;YI Changcheng;LIU Zhifang;LEI Jianyin;LI Shiqiang(Institute of Applied Mechanics,College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;Shanxi Key Laboratory of Material Strength and Structural Impact,Taiyuan 030024,Shanxi,China)

机构地区：[1]太原理工大学机械与运载工程学院应用力学研究所,山西太原030024 [2]材料强度与结构冲击山西省重点实验室,山西太原030024

出　　处：《爆炸与冲击》2025年第1期75-87,共13页Explosion and Shock Waves

基　　金：国家自然科学基金(12072219,12272254);山西省自然科学研究面上项目(202203021211170);海安太原理工大学先进制造与智能装备产业研究院开放研发项目(2023HA-TYUTKFYF016);山西省科技创新人才团队(领军)专项资助(202204051002006)。

摘　　要：将气相二氧化硅颗粒与聚乙二醇溶液混合制备的剪切增稠液(shear-thickening fluid,STF)填充到蜂窝芯层中,制成了STF填充蜂窝夹芯板。通过落锤冲击实验,研究了冲击速度(1.0、1.5、2.0 m/s)、蜂窝孔径(2.0、2.5、3.0 mm)和壁厚(0.04、0.06、0.08 mm)对夹芯板力学性能的影响。利用数字图像相关技术测量了结构的应变历史和后面板挠度场的分布情况,探讨了结构的低速冲击响应过程。实验结果表明,在低速冲击下,未填充STF蜂窝夹芯板的变形模式为后面板中心区域凸起变形,周围区域有明显鼓包变形;填充STF蜂窝夹芯板的变形模式为后面板凸起变形且局部凸起区域较大,周围无鼓包产生。STF的剪切增稠效应可以增加参与能量吸收的蜂窝单元,扩大结构的局部变形区域,减小结构的后面板挠度。提高冲击速度、增大蜂窝孔径或者减小壁厚,都更有利于STF的剪切增稠效应。As an environmentally friendly energy-absorbing material,shear-thickening fluid(STF)can be applied to protective structures to improve impact resistance.STF was obtained by mixing fumed silica particles with polyethylene glycol solution.It was then filled into a honeycomb core layer to make STF-filled honeycomb sandwich panels.Finally,the effect of STF on the impact resistance of the structure was explored.The impact force-displacement curves were obtained by using the drop weight impact experiment,and the effects of impact velocity(1.0,1.5,2.0 m/s),honeycomb aperture diameter(2.0,2.5,3.0 mm),and wall thickness(0.04,0.06,0.08 mm)on the mechanical properties of the sandwich panel were studied.At the same time,digital image correlation technology was utilized,which is an optical method for measuring the deformation of the surface of an object.By comparing the pixel displacements in multiple images,the strain history and deflection field distribution of the back panel of the structure were obtained,and the low-velocity impact response process of the structure was discussed.The experimental results show that under low-velocity impact,there is bump deformation in the center area of the back panel of the STF-unfilled honeycomb sandwich panel,and there is obvious bulging deformation in the surrounding area.The central area of the back panel of the STF-filled honeycomb sandwich panels has a wider range of bump deformations and no bulging around it.The shear-thickening effect of STF can increase the honeycomb elements involved in energy absorption,expand the local deformation area of the structure,and reduce the deflection of the back panel of the structure.Increasing the impact velocity,increasing the honeycomb aperture diameter,or decreasing the wall thickness are all more conducive to the shear-thickening effect of STF.The results provide a reference for the application of STF in protective structures.

关 键 词：剪切增稠液 蜂窝夹芯板 低速冲击 变形模式 数字图像相关技术 

分 类 号：O347.3[理学—固体力学]