VSE Research Laboratory,Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Kuala Lumpur, Malaysia.
Mechanical Engineering Department, Faculty of Engineering, Universitas Sebelas Maret, Cetral Java, Surakarta, Indonesia.
PLoS One. 2018 Apr 9;13(4):e0191795. doi: 10.1371/journal.pone.0191795. eCollection 2018.
In this study, a new magnetorheological (MR) grease was made featuring plate-like carbonyl iron (CI) particles, and its magnetic field-dependent rheological properties were experimentally characterized. The plate-like CI particles were prepared through high-energy ball milling of spherical CI particles. Then, three different ratios of the CI particles in the MR grease, varying from 30 to 70 wt% were mixed by dispersing the plate-like CI particles into the grease medium with a mechanical stirrer. The magnetic field-dependent rheological properties of the plate-like CI particle-based MR grease were then investigated using a rheometer by changing the magnetic field intensity from 0 to 0.7 T at room temperature. The measurement was undertaken at two different modes, namely, a continuous shear mode and oscillation mode. It was shown that both the apparent viscosity and storage modulus of the MR grease were heavily dependent on the magnetic field intensity as well as the CI particle fraction. In addition, the differences in the yield stress and the MR effect between the proposed MR grease featuring the plate-like CI particles and the existing MR grease with the spherical CI particles were investigated and discussed in detail.
在这项研究中，制备了一种新型的磁流变（MR）脂，其特点是具有片状羰基铁（CI）颗粒，并对其磁场依赖的流变性能进行了实验表征。片状 CI 颗粒是通过对球形 CI 颗粒进行高能球磨制备的。然后，通过机械搅拌将片状 CI 颗粒分散到油脂介质中，混合了三种不同比例的 CI 颗粒在 MR 油脂中的含量，从 30 到 70wt%不等。通过流变仪在室温下从 0 到 0.7T 改变磁场强度，研究了基于片状 CI 颗粒的 MR 油脂的磁场依赖流变性能。测量采用两种不同模式，即连续剪切模式和振荡模式。结果表明，MR 油脂的表观粘度和储能模量都严重依赖于磁场强度和 CI 颗粒的分数。此外，详细研究和讨论了具有片状 CI 颗粒的所提出的 MR 油脂与具有球形 CI 颗粒的现有 MR 油脂之间的屈服应力和磁流变效应的差异。
