Rheological Characteristics of Nanocomposite-based Magnetorheological Suspension

TLDR: In this paper, the magnetic field-induced shear stress (Δτ) and response time of a nanocomposite-based magnetorheological (MR) suspension were determined as functions of magnetic field strength (H), shear rate (γ), and temperature (T).

Abstract: The magnetic field-induced shear stress(Δτ)and the response time (Δt) for a nanocomposite-based magnetorheological (MR) suspension were determined as functions of magnetic field strength (H), shear rate (γ) and temperature (T). The results showed that Δt had almost independence of H, γ and 71 The MR suspension responded to external magnetic field a little lower at "switching off" than at "switching on" . Δτ increased with the increase of H, a maximum of Δτ occurred with increasing γ ,and Δτ slowly decreased with T. The quantity relationship among them fitted in with the equation of Δτ=kHH+( kγ1- kγ2γ) γ -ktτT very well, where kH=28.32,kγ1=2.85,kγ2=0.0013, kt=3.8 . Using this equation can characterize well the properties for the MR suspensions, which is the basis of designing MR intelligent devices.