Research On Multi-field Coupling Behavior Of Magnetically Sensitive High-elastic Smart Materials

Magnetically sensitive smart materials with high elasticity have the unique characteristics of controllability,reversibility and quick response,which have the advantages of magnetorheological materials and high polymers,and have a broad application prospect in the fields of vibration control and electromagnetic devices.Its mechanical response behavior involves the coupling of deformation field,magnetic field and temperature field,which is directly related to the performance index and reliable operation of the intelligent system.In this thesis,the nonlinear multi-field coupling mechanical response of magnetically sensitive high-elastic smart materials is studied theoretically.The magnetically sensitive high elastic body is a kind of composite material.First,because the most significant and important mechanical property of the matrix is its viscoelasticity.Temperature has a significant effect on the static viscoelasticity(creep and relaxation)and dynamic viscoelasticity(hysteretic and loss)of the polymer.Reference based on the temperature sensitive properties of the material,also have significant viscoelasticity of rubber,asphalt,plastic,resin,such as polymer materials,polymer thermal viscoelastic model is established,the polymer matrix are given under the condition of different temperatures of stress-strain relation,and analyzes the temperature on the storage modulus,loss modulus and loss factor of mechanics and compare with the experimental results verify the influence of the amount of,it is found that theoretical prediction model fit well with the experimental results,proved the effectiveness of the polymer matrix of the thermal viscoelastic model.The model can well describe the influence of temperature field on the macroscopic mechanical behavior of materials.Secondly,the magnetic-force-thermal multifield coupling constitutive model of ferromagnetic particles in composites is established.Model can quantitatively study of ferromagnetic particles in different magnetic field,temperature field,stress field of magnetostrictive behavior,on the basis of ferromagnetic particles in their sensitivity to the environment temperature is analyzed emphatically,and the saturated magnetostrictive strain value under different temperature,the results of the study to improve the material of magnetic scaling can have important guiding significance.Finally,the comprehensive consideration of polymer matrix of the thermal viscoelastic model and ferromagnetic particles in magnetic force-thermal field coupling constitutive model,a comprehensive analysis of magnetic field,temperature field,deformation field effect on the change law of the material structure,the resulting high magnetic susceptibility projectile magnetic thermal viscoelastic model,further improve the high magnetic susceptibility play physical-magnetic-thermal coupling constitutive theory framework.In this paper,a more perfect theoretical framework of magnetothermal-viscoelastic coupling is proposed,based on which the influence of temperature field on the magnetic properties and mechanical response of magnetically sensitive high-elastic intelligent materials is studied,a mechanical model of magneto-force-thermal multi-physical field coupling is established,and the corresponding numerical simulation program is written.The relationship among external magnetic field,stress and temperature is simulated quantitatively,and it is found that heat loss is closely related to stress field and magnetic field.In conclusion,through the research in this paper,the effects of coupling effects between multiple physical fields on the mechanical behavior of magnetically sensitive high-elastic smart materials are further understood,and the theoretical framework for describing the magnetic and mechanical properties of magnetically sensitive high-elastic smart materials is improved.It provides an effective research idea for solving other multifield coupling problems.It lays a certain theoretical foundation for the application of magnetically sensitive high-elastic intelligent material devices in practical engineering and provides a reliable theoretical basis for the design and research of intelligent systems.