宾汉塑料
磁流变液
Herschel–Bulkley液体
电流变液
产量(工程)
材料科学
膨胀的
阻尼器
流变学
剪切速率
剪切减薄
剪应力
剪切(地质)
本构方程
机械
结构工程
工程类
复合材料
物理
有限元法
电场
量子力学
标识
DOI:10.1177/1045389x07088107
摘要
Quasisteady modeling of linear stroke flow mode magnetorheological (MR) (or electrorheological (ER)) dampers has focused primarily on the utilization of the Bingham-plastic constitutive model to assess performance metrics such as damping capacity. In such Bingham-plastic MR (or ER) flows, the variable yield stress of the fluid, τ y , is activated by applying magnetic (or electric) field. The Bingham-plastic model assumes that the material is in either (1) a pre-yield condition where the local shear stress is less than the yield stress, τ<τ y , or (2) a post-yield condition, where the local shear stress is greater than the yield stress, τ > τ y , so that the material flows with a constant post-yield viscosity. The objective of this study is to analyze the damping capacity of such a controllable MR or ER damper in the situation when the field dependent fluid exhibits post-yield shear thinning or thickening behavior, that is, the post-yield viscosity is a function of shear rate. A Herschel—Bulkley model with a field dependent yield stress is proposed, and the impact of shear rate dependent viscosity on damping capacity is assessed. Key analysis results — velocity profile, pre-yield thickness, and damping coefficient — are presented in a nondimensional formulation that is consistent with prior results for the Bingham-plastic analysis. The nondimensional analysis formulated here clearly establishes the Bingham number as the independent variable for assessing flow mode damper performance.
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