疏水硅胶颗粒的吸能机理研究  

Energy absorption mechanism of hydrophobic silica gel particles

作　　者：赵鹏[1] 余慕春 陈前[1] ZHAO Peng;YU Muchun;CHEN Qian(State Key Lab of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics andAstronautics,Nanjing 210016,China;China Academy of Launch Vehicle Technology,Beijing 100076,China)

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室,南京210016 [2]中国运载火箭技术研究院,北京100076

出　　处：《振动与冲击》2019年第5期128-134,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(11472127);江苏省研究生科研与实践创新计划项目(KYCX17_0236);江苏高校优势学科建设工程资助项目

摘　　要：疏水硅胶是一种由水和布满微孔的疏水硅胶颗粒组成的缓冲介质,将疏水硅胶密封在可压缩的液压缸内即可形成疏水硅胶缓冲器。在冲击过程中利用水分子侵入和逸出疏水微孔,可以实现能量的存储、转化和消耗。基于Laplace-Washburn方程和接触角迟滞模型,研究水分子侵入和逸出疏水微孔的过程,建立疏水硅胶的力学模型;采用准静态试验验证疏水硅胶的力学模型,并根据实测的力-位移曲线计算疏水硅胶的耗能效率。结果表明:理论与试验结果具较好的一致性;疏水硅胶在加载与卸载过程中呈现较大的迟滞现象,是一种理想的吸能材料;若设计得当,疏水硅胶具有优异的缓冲性能。Hydrophobic silica gel is a shock energy absorption buffer medium consisting of water and hydrophobic silica gel particles covered with micro-pores.It is sealed in a compressible hydraulic cylinder to form a hydrophobic silica gel buffer.During impact processes,water molecules invade and escape from hydrophobic micro-pores to realize energy storage,conversion and dissipation.Based on Laplace-Washburn equation and the contact angle hysteresis model,the process of water molecules invading and escaping from hydrophobic micro-pores was studied to establish hydrophobic silica gel’s mechanical model.Quasi-static tests were used to verify this mechanical model,and according to the actually measured force-displacement curve,the energy-dissipating efficiency of hydrophobic silica gel was calculated.The results showed that the theoretical results are better consistent to test ones;hydrophobic silica gel reveals a larger hysteretic phenomenon in loading and unloading processes,it is an ideal energy-absorbing material;if the design is appropriate,hydrophobic silica gel has excellent buffering performance.

关 键 词：疏水硅胶 迟滞 缓冲 

分 类 号：TH113[机械工程—机械设计及理论]