摘要
在Span油凝胶中添加不同质量分数(1.0%~10.0%)亲水改性SiO_(2)纳米颗粒,通过流变性能测试确定了SiO_(2)最佳添加量;采用最佳SiO_(2)添加量下的有机凝胶制备剪切稀化有机凝胶基磁流变液,研究了该磁流变液的性能。结果表明:添加质量分数5.0%SiO_(2)纳米颗粒时,有机凝胶的黏度随剪切速率的变化范围最大,剪切稀化特征最明显,故确定5.0%为最佳添加量。采用SiO_(2)最佳添加量下的有机凝胶制备的剪切稀化有机凝胶基磁流变液在磁场作用下具有较高的屈服应力和剪切应力,仅在低剪切速率高磁场强度条件下屈服应力略微降低,具有良好的磁响应性能。剪切稀化有机凝胶基磁流变液具有较宽的线型黏弹区,表现出显著的弹性特征。剪切稀化有机凝胶基磁流变液的触变环面积大于Span油凝胶基磁流变液,响应时间较矿物油基磁流变液延长了6 ms。
Hydrophilic modified SiO_(2) nanoparticles were added to Span oleogel at different mass fractions(1.0%‒10.0%),and the optimal SiO_(2) content was determined through rheological tests.A shear-thinning organogel based magnetorheological fluid was prepared using the organogel with the optimal SiO_(2) content,and its properties were investigated.The results show that at the SiO_(2) nanoparticle mass fraction of 5.0%,the organogel exhibited the widest variation in viscosity with shear rate and the most pronounced shear-thinning behavior,thus 5%was identified as the optimal addition amount.The shear-thinning organogel based magnetorheological fluid prepared with the optimal SiO_(2) content showed high yield stress and shear stress under magnetic fields,with only a slight decrease in yield stress under conditions of low shear rate and high magnetic field intensity,demonstrating good magnetoresponsive performance.This fluid possessed a broad linear viscoelastic region and exhibited significant elastic characteristics.The thixotropic loop area of the shear-thinning organogel based magnetorheological fluid was larger than that of the Span oleogel based magnetorheological fluid,and its response time was prolonged by 6 ms compared to that of the mineral oil based magnetorheological fluid.
作者
张寒松
胡志德
蒋昊洋
陈小云
许春霞
李治霞
ZHANG Hansong;HU Zhide;JIANG Haoyang;CHEN Xiaoyun;XU Chunxia;LI Zhixia(Department of Engineering Mechanics and Materials,Engineering University of the Joint Logistics Support Force,Chongqing 401311,China)
出处
《机械工程材料》
北大核心
2026年第2期49-54,共6页
Materials For Mechanical Engineering
基金
装备综合研究项目(LJ20242Z050019-3)。
关键词
磁流变液
剪切稀化
有机凝胶
流变性能
magnetorheological fluid
shear-thinning
oraganogel
rheological performance
