A clutch is a mechanism for transmitting rotation, which can be both engaged and disengaged. Rear side of a Ford V6 engine, looking at the clutch housing on the flywheel Single, dry, clutch friction disc. ...
An electrorheological clutch comprises drive and driven members that can be selectively engaged by the application of a voltage to an electrorheological (ER) fluid. ER fluid is used as the coupling between the input and the output (drive and driven members).
An ER fluid generally comprises a large number of very small particles suspended in an electrically insulating liquid. ER fluids have the property that the viscosity of the fluid can be controlled by the application of an electrical field. In particular, upon the application of a fairly large electrical field (say>1 kV/mm) the viscosity can increase to the extent that the fluid becomes almost solid, i.e. possessing a finite shear modulus and being capable of transmitting shear stress. This change is often very rapid (eg 0.01 s) and is reversible, i.e. the ER fluid will return to a fluid state upon removal of the applied electrical field. In physics, an electric field or E-field is an effect produced by an electric charge that exerts a force on charged objects in its vicinity. ... The pitch drop experiment at the University of Queensland. ... In materials science, shear modulus S, sometimes referred to as the modulus of rigidity, is defined as the ratio of shear stress to the shear strain: S = shear stress/shear strain = (F/A)/Φ. Another commonly accepted symbol is G. Shear modulus is usually measured in ksi (kips per square...
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