Normal force of lithium-based magnetorheological grease under quasi-static shear with large deformation.

7 that, under a given shear strain, normal force exhibits a decreasing trend with the increase of shear rate, and this change regularity is affected by the external magnetic field.

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The normal stress showed an increasing trend with the increase of magnetic field and shear rate but decrease suddenly at the beginning of shear thickening in MR fluid. 20 Pang et al. investigated the normal stress of MR polymer under large amplitude oscillatory shear, and revealed that the change in normal stress of MR polymer is drastically affected by factors: the Poynting effect and the particle structure. 21 Ju et al. studied the normal force of MR gel under steady and dynamic shear test.

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