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总览 评价 张玮 ， 龚兴龙 * （ 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； ） 摘要： 磁流变弹性体是一种新型的功能材料和智能材料，其力学性能可以由外加磁场来控制。磁流变弹性体经常被用于各类振动器械中，受到循环加载力的
张玮， 龚兴龙*
（
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； ）
摘要：
磁流变弹性体是一种新型的功能材料和智能材料，其力学性能可以由外加磁场来控制。磁流变弹性体经常被用于各类振动器械中，受到循环加载力的作用，这就会引起材料的疲劳。本文主要研究了顺丁橡胶基磁流变弹性体在循环加载条件下的疲劳特性。试验中共制备了三种不同铁颗粒含量的样品，分别是铁颗粒质量比60%，70%和80%的样品。在循环加载测试中，所用到的三种加载幅值分别为50%，75%和100%。循环加载后我们用改进的动态热机械分析仪（a modified dynamic mechanic analyzer）分别对材料的储能模量、损耗模量和磁流变效应进行了测试和评估。试验结果显示，铁颗粒含量为80%的样品，其模量和磁流变效应强烈的依赖于循环加载的幅值和循环次数。颗粒含量为70%的样品其性能对加载条件的依赖性不如80%的那么强烈，而颗粒含量60%的样品其模量基本与循环加载条件无关。为了更好的研究材料的疲劳特性，我们还做了准静态拉伸测试并进行了原位观察同时拍下了扫描电镜照片进行详细分析和研究。
关键词：
力学性能；磁流变弹性体；疲劳；顺丁橡胶；原位观察
Zhang Wei， Gong Xinglong*
（
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China(USTC)； ）
Abstract：
Magnetorheological elastomers based devices often operate at dynamic modes, such as cyclic deformation, which can result in a fatigue problem of MRE materials. This study reports the investigation on fatigue properties of MRE samples based on cis-Polybutadiene rubber by using a fatigue test machine. Three MRE samples, with iron particles mass fraction of 60%, 70% and 80%, were fabricated and their properties dependence of three strain amplitudes (50%, 75%, and 100%) were measured. The absolute MR effect, storage modulus (G\\\\\\\\\\\\\\\') and loss modulus (G\\\\\\\\\\\\\\\'\\\\\\\\\\\\\\\') of MRE samples after fatigue were evaluated by a modified dynamic mechanical analyzer (DMA). The results revealed that MR effect, G\\\\\\\\\\\\\\\' and G\\\\\\\\\\\\\\\'\\\\\\\\\\\\\\\' of MREs containing 80% iron particles depended strongly on the strain amplitudes and number of cycles, while G\\\\\\\\\\\\\\\' and G\\\\\\\\\\\\\\\'\\\\\\\\\\\\\\\' of MREs containing 70% iron particles also depended on the strain amplitudes and number of cycles but not as strongly as sample which contains 80% iron particles, at same time the properties of MREs containing 60% iron particles after cyclic deformation were almost independent of the fatigued conditions. In order to investigate the fatigue mechanism of MREs, the sample was carried out a quasi-static tensile testing and its surface morphology during testing was observed in situ by SEM.
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