Abstract
The results of an experimental study of the rheological behavior of highly concentrated magnetorheological fluids of complex composition containing the main magnetosensitive filler –carbonyl iron and additives – particles of aerosil, chromium dioxide, and bentonite clay are presented. The modes of continuous shear deformation, linear increase of shear stress, and harmonic shear oscillations are considered. The influence of the additive material on shear stress, yield stress, components of the complex shear modulus of magnetorheological fluids in a magnetic field is determined.
Highlights
In various industries, flat thin-walled elements of a layered structure are used in order to reduce material consumption while maintaining the required strength and rigidity of products
The features of the rheological behavior of the magnetorheological composite fluids (MRF) at continuous shear, linear increase of shear stress, sinusoidal tangential oscillations depending on the material of additives and magnetic field induction are established
It has been established that in the continuous shear mode, the composition of MRF with bentonite clay shows a smooth increase in the shear stress with increasing shear rate, providing a greater range of its regulation
Summary
In various industries (machine building and shipbuilding, aviation, rocket and space technology, etc.), flat thin-walled elements (beams, plates, and shells) of a layered structure are used in order to reduce material consumption while maintaining the required strength and rigidity of products. The most important requirement at the stage of development of such structures, which experience dynamic loads of a wide range of frequencies and strains, is to ensure their vibration protection while maintaining the rigidity of objects (Librescu and Hause, 2000). “Passive” methods are based on the use of inertial, elastic, and dissipative elements. They are implemented by introducing damping elements made of elastic or viscoelastic materials placed between the bounding layers into the object structure. Active or semi-active vibration damping systems use an external energy source to automatically adjust the dynamic characteristics of the structure (for example, hydropneumatic systems) (Song, 2009; Akhtar et al, 2015)
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