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龚立平,王胜,尹冠生*,宣守虎.磁流变剪切变硬胶的“磁力”耦合效应研究[J].实验力学,2017,32(6):751~759
磁流变剪切变硬胶的“磁力”耦合效应研究
Investigation on the “Magnetic-Mechanic” Coupling Performance of Magnetorheological Shear Stiffening Polymer Composite
投稿时间: 2017-08-11  最后修改时间: 2017-10-18
DOI:10.7520/1001-4888-17-314
中文关键词:  剪切变硬性能  磁流变效应  磁力耦合行为  实验力学
英文关键词:shear stiffening property  magnetorheological effect  magnetic-mechanic coupling performance  experimental mechanics
基金项目:国家自然科学基金(11372301/11772320)资助
作者单位
龚立平 长安大学 理学院, 西安 710061 
王胜 中国科学技术大学 近代力学系 中国科学院材料力学行为与设计重点实验室, 合肥 230027 
尹冠生* 长安大学 理学院, 西安 710061 
宣守虎 中国科学技术大学 近代力学系 中国科学院材料力学行为与设计重点实验室, 合肥 230027 
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中文摘要:
      剪切变硬胶(shear stiffening gel)是一种新型智能材料,由于其在外界应力刺激下模量可以迅速增大,表现出优良的剪切变硬效应,所以在人体防护和阻尼隔振等领域具有重要的应用前景。本文将软磁性羰基铁粒子(CI)引入到剪切变硬胶体中,成功制备出多功能磁流变剪切变硬胶复合材料(MSC),通过流变测试系统分析了该复合材料的“磁力”耦合效应。研究表明,MSC具有优良的剪切变硬效应(S-ST effect),其储能模量随着剪切频率的增加而显著增大(4个数量级)。磁控测试和蠕变实验结果均表明该复合材料对于外界磁场表现出较好的响应性能。当羰基铁粉含量为60wt%时,样品的模量随着磁场的增加而迅速增大,其最大模量高达2.44MPa。在磁场和剪切应力双重刺激下,复合材料的剪切变硬效应得到极大提高,且剪切应变增大,样品模量相对降低。同时,该材料在低温下也具有良好的剪切变硬和磁流变效应,高温下性能略有下降。最后,探讨了MSC在磁场、剪切场耦合条件下性能增强原因,发现“B-O化学交联键”和CI粒子链的形成是该复合材料具有优良剪切变硬效应和磁流变性能的主要原因。
英文摘要:
      Shear stiffening gel is a novel intelligent material. Its modulus can increase rapidly due to external stress stimulation showing excellent shear stiffening effect, so it has important application prospects in physical protection and damping vibration isolation. In this paper, multifunctional magnetorheological shear stiffening polymer composite (MSC) is prepared by dispersing carbonyl iron (CI) into shear stiffening polymer matrix and its “magnetic-mechanic” coupling performance is systematically investigated by rheological testing system. Results indicate that MSC presents excellent shear stiffening effect (S-ST effect), its storage modulus increases significantly (4 orders of magnitude) with the increase of shear frequency. The mechanical properties of MSC were also enhanced dramatically by magnetic field, indicating its ideal magnetorheological effect. When the content of carbonyl iron powder is 60wt%, the modulus of the specimen increases rapidly with the increase of magnetic field, and the maximum modulus is up to 2.44MPa. More importantly, the storage modulus of MSC was largely enhanced and precisely controlled by changing shear force and magnetic field and it decreased with the increasing of shear strain. In addition, the temperature dependent mechanical properties of MSC were also studied and it could maintain stable mechanical performance at low temperature. Finally, the “magnetic mechanic” coupling mechanism was discussed. It is found that due to the formation of “B-O cross bond” and the CI particle chains induced by magnetic field, this composite presents excellent shear stiffening effect and magnetorheological properties.
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