磁性材料及器件
磁性材料及器件
자성재료급기건
JOURNAL OF MAGNETIC MATERIALS AND DEVICES
2013年
1期
6-9
,共4页
魏齐龙%王超%罗清%何建国
魏齊龍%王超%囉清%何建國
위제룡%왕초%라청%하건국
磁流变液%流变行为%流变模型%磁场
磁流變液%流變行為%流變模型%磁場
자류변액%류변행위%류변모형%자장
magnetorheological fluid%rheological behavior%rheological models%magnetic field
制备了羰基铁粉为磁性颗粒的水基磁流变液.分别测定了该磁流变液磁场作用下的流变行为及零场流变行为,并采用Bingham模型和Casson模型及剪切稀化关系对获得的流变行为进行了拟合计算,探讨了磁流变液的剪切屈服强度和磁场强度之间的响应关系.研究表明,Bingham模型和Casson模型均可较好地描述磁流变液的流变行为;磁场作用下,磁流变液的剪切应力和表观粘度显著增高,剪切屈服强度从约2Pa 增大到约80kPa;剪切率为50s-1时的表观粘度从约64mPa·s增加到约1600Pa·s;该磁流变液的剪切屈服强度与磁场强度之间存在指数关系,其值约为1.7~1.8.
製備瞭羰基鐵粉為磁性顆粒的水基磁流變液.分彆測定瞭該磁流變液磁場作用下的流變行為及零場流變行為,併採用Bingham模型和Casson模型及剪切稀化關繫對穫得的流變行為進行瞭擬閤計算,探討瞭磁流變液的剪切屈服彊度和磁場彊度之間的響應關繫.研究錶明,Bingham模型和Casson模型均可較好地描述磁流變液的流變行為;磁場作用下,磁流變液的剪切應力和錶觀粘度顯著增高,剪切屈服彊度從約2Pa 增大到約80kPa;剪切率為50s-1時的錶觀粘度從約64mPa·s增加到約1600Pa·s;該磁流變液的剪切屈服彊度與磁場彊度之間存在指數關繫,其值約為1.7~1.8.
제비료탄기철분위자성과립적수기자류변액.분별측정료해자류변액자장작용하적류변행위급령장류변행위,병채용Bingham모형화Casson모형급전절희화관계대획득적류변행위진행료의합계산,탐토료자류변액적전절굴복강도화자장강도지간적향응관계.연구표명,Bingham모형화Casson모형균가교호지묘술자류변액적류변행위;자장작용하,자류변액적전절응력화표관점도현저증고,전절굴복강도종약2Pa 증대도약80kPa;전절솔위50s-1시적표관점도종약64mPa·s증가도약1600Pa·s;해자류변액적전절굴복강도여자장강도지간존재지수관계,기치약위1.7~1.8.
An aqueous magnetorheological fluid (MRF) was prepared with carbonyl iron powders as magnetic particles. Rheological behaviors of the MRF both in on-state and off-state were measured, and the measured results were fitted with Bingham model, Casson model and shear-thinning relationship, respectively. Also the responding relationship bewteen yield shear stress and magnetic field strength was discussed. It was found that both the Bingham and Casson model could well describe rheological behaviors of the MRF, and both shear stress and apparent viscosity increase markedly in on-state, with increasing yield shear stress from about 2 Pa to about 80 kPa, and increasing apparent viscosity at shear rate 50 s-1 from about 64 mPa·s to about 1600 Pa·s. There was a exponential relationship between yield shear stress and magnetic field strength, with the exponent about 1.7~1.8.