Prediction of fatigue life is particularly crucial in magnetorheological elastomer (MRE) based rubber components, especially when are exposed to repetitive magnetic and cyclic loading. MREs are smart composites that contain soft elastomer matrix and carbonyl iron particles (CIPs). In this research, silicon rubber was mixed with 20% of CIPs in the absence of an external magnetic field to produce MREs. Firstly, for the determination of material constants (including hyper elastic, magnetic, and viscoelastic), two types of tests such as uniaxial compression and relaxation, were performed on the samples. Then, fatigue tests were performed by a servo-hydraulic fatigue testing machine with cyclic loading in a repetitive magnetic field. Fatigue equations were obtained based on the number of fatigue life and maximum stress. The results confirmed that maximum stress could be used as a trustworthy fatigue life predictor for MREs when they are subjected to a combination of repetitive magnetic and cyclic loading. Scanning electron microscopy images from fatigue crack showed that the internal structure of MREs became stronger in the direction of the magnetic field. The maximum stress of the MRE was smaller in the absence of a magnetic field and decreased as the number of fatigue cycles increased with and without the magnetic field.

疲劳寿命的预测对于基于磁流变弹性体 (MRE) 的橡胶部件尤其重要，尤其是在暴露于重复磁性和循环载荷时。MRE 是智能复合材料，包含软弹性体基体和羰基铁颗粒 (CIP)。在这项研究中，在没有外部磁场的情况下，将硅橡胶与 20% 的 CIP 混合以产生 MRE。首先，为了确定材料常数（包括超弹性、磁性和粘弹性），对样品进行了单轴压缩和松弛两种类型的测试。然后，通过伺服液压疲劳试验机在重复磁场中循环加载进行疲劳试验。根据疲劳寿命次数和最大应力得到疲劳方程。结果证实，当 MRE 承受重复磁性和循环载荷的组合时，最大应力可用作可靠的疲劳寿命预测指标。疲劳裂纹的扫描电子显微镜图像表明，MREs 的内部结构在磁场方向上变得更强。MRE 的最大应力在没有磁场的情况下较小，并随着疲劳循环次数的增加而降低，有无磁场。