Research On The Effect Of Orientation Magnetic Field On The Magneto-mechanical Of Magnetorheological Elastomers

Magnetorheological elastomers is by the high elastic rubber base,micro/nanoscale magnetic susceptibility particles produced after a series of process such as mixing,curing processing and become,because this material not only has large deformation properties of rubber materials,at the same time also has a magnetic field shape,mechanical and magnetic properties of controllable characteristics,gradually in vibration noise reduction,intelligent sensor,and reflect the huge application potential biomedical field.In order to obtain more abundant deformation behavior and excellent magnetorheological mechanical properties,researchers have carried out detailed theoretical and experimental characterization of the magnetorheological elastomer from the basic composition,preparation method and environmental conditions,etc.However,the study on the mechanical and magnetic coupling properties of magnetorheological elastomers with some specific microstructure distribution is not mature,and there is a lack of more perfect theoretical and experimental research.Based on this,in this study,the size and direction of the external magnetic field in the preparation process were changed to control the distribution of particles in the material,and the effects of the size and direction of the orientation magnetic field on the magnetorheological elastomechanical force magnetic properties were discussed by means of experimental and theoretical analysis.The specific research contents are as follows:Firstly,the magnetorheological elastomers with different microstructure distribution characteristics were obtained by using silicone rubber as matrix,carbonyl iron powder as filling particle and silicone oil as plasticizer in the orientation magnetic field with different intensities and angles.Scanning electron microscope(SEM)was used to quantitatively analyze the microstructure characteristics of the prepared materials.It was found that the particle distribution in the prepared materials was significantly correlated with the external magnetic field.With the increase of the intensity of external magnetic field,the magnetosensitive particles tend to be straight chain structure.When the Angle of the external magnetic field changes,the magneticsensitive particles also show an oblique distribution inside the material.Secondly,the magnetorheological elastomers obtained under different orientation magnetic field angles were tested under different loading modes by means of the magnetorheological coupling test device.The results show that under the same test magnetic field and external load,the shear modulus and relative magnetorheological effect of the prepared magnetorheological material increase with the increase of the orientation magnetic field intensity,and the initial shear modulus of the magnetorheological elastomer with 30° inclined chain is the largest.In addition,also found that the magnetic response material force has close relationship with the shear direction: when the shear direction with magnetic chain into acute Angle,material shear modulus is higher than shearing direction and chain obtuse Angle,Angle of 30° and when the chain has high relative magnetorheological effect,when shear direction and chain obtuse Angle,Angle of 0° composite material has larger relative magnetorheological effect.Finally,the magnetorheological elastomers obtained in different magnetic field intensities were tested on the magnetorheological coupling shear properties,and the relationship between the magnetorheological elastomers magnetic properties and the content of silicone oil and the strength of the magnetic field orientation was obtained.The results show that the greater the content of silicone oil,the greater the relative magnetorheological effect;However,the shear modulus decreases relatively.The shear modulus and relative magnetorheological effect of the prepared materials also increase with the increase of the oriented magnetic field.Considering that the movement of magnetosensitive particles in the preparation process is affected by the viscoelasticity of the matrix,a magnetic dipole model considering the inclination Angle of the magnetosensitive particle chain obeying the exponential distribution is proposed,and the correlation between the magnetorheological elastic physical force magnetic energy and the orientation magnetic field strength is explained.