Shear Yield Stress of Magnetorheological Fluids between Characteristic Surfaces of Different Materials

摘要

Magnetorheological fluids (MRFs) have a wide range of applications in automotive and other industrial fields. As one of the main performance parameters of MRFs, static yield stress is the demarcation point of solid-liquid performance conversion. Therefore, yield stress is important to the study of MRFs. In this work, a new type of MRF testing device was designed. Three types of material blocks, namely, steel, copper, and aluminum, were tested to determine wall slippage using MRF-122E and MRF-132D. The results indicate that the best pulling blocks were the 1-mm copper rectangular channel and the 2-mm aluminum triangle channel. Identity distance was also tested, and the result indicated that the 1-mm copper pulling block and identity distance of 5-mm curve were nearest to the Lord Corporation yield curve with a maximum relative error within 5 %.