A resonance shear force rheometer modeled as simple oscillating circuit
A resonance shear force rheometer modeled as simple oscillating circuit
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模拟为简单振荡电路的共振剪切力流变仪
DOI：
10.1063/1.1148904
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发表时间：
1998
影响因子：
1.6
通讯作者：
K. Kurihara
中科院分区：
文献类型：
--
作者：
C. Dushkin;K. Kurihara
利用剪切力仪，发展了一种研究超薄液体薄膜和弹性材料粘弹性的新的共振方法。附加在钢板弹簧上的振动压电单元产生的剪应力由电容探头记录为横向位移。振荡频率围绕机械系统的共振频率变化，以跟踪共振峰的幅度和相位。得到了两种参考状态：空气中自由振动的共振和悬臂弹簧与剪切机械单元接触时的约束共振。液膜的存在根据液膜厚度和悬臂载荷的不同而改变这些共振状态。提出了一个简单的力学模型，该模型考虑了不同部件对有效弹簧、质量和阻尼常数的贡献。该模型将液膜效应与机械部件的背景振动分离开来。将该方法应用于固体表面弹性接触问题的研究。
A novel resonance method for studying the viscoelasticity of very thin liquid films and elastic materials is developed using a shear force apparatus. The shear stress created by an oscillating piezo unit attached to leaf springs is recorded as the lateral displacement by capacitance probe. The oscillation frequency is varied around the resonance frequency of the mechanical system in order to trace the amplitude and the phase of the resonance peak. Two reference states are obtained: the resonance of free oscillations in air and one under constrain introduced by the cantilever spring in contact with the shear mechanical unit. The presence of a liquid film changes these resonance states depending on the film thickness and the cantilever load. A simple mechanical model is proposed entrapping the contribution of different parts in effective spring, mass, and damping constants. The model separates the effect of the liquid film from the background oscillation of the mechanical parts. The method is applied here to investigate the elastic contact between two solid surfaces.