Study On Multi-field Coupling Mechanical Behavior Of Piezomagnetic-Piezoelectric Semiconductor Composite Structures

Piezoelectric semiconductor materials have both piezoelectric and semiconductor properties.It has potential possibility to be applied to main natianl development fields such as new energy,aerospace,unmanned driving,information and medical treatment.Piezomagneto-piezoelectric semiconductor laminated composite is a new generation of piezoelectric semiconductor device.The magneto-force-electric-carrier coupling properties of piezomagneto-piezoelectric semiconductor composites are adjusted by magnetic field to control the deformation of piezomagneto-piezoelectric materials.Therefore,this report investigate one-dimensional piezomagnetic-piezoelectric semiconductor composites by following studies:1.In order to obtain a one-dimensional equation suitable for the deformationpolarimetric carrier redistribution of piezomagnetic-piezoelectric semiconductor composites,the Mindlin series expansion method is used to expand the displacement,potential and incremental carrier concentration according to the basic semiconductor equation and linear piezoelectric equation.Then,it is possible to get the zero-order and one-order simplified theoretical equations for tensile,bending and shear deformation of composites.2.The tensile deformation behavior of piezomagnetic-piezoelectric semiconductor composites under constant magnetic field and harmonic magnetic field is studied respectively.The quantitative results show that the magnetic field intensity,initial carrier concentration and material thickness ratio can significantly affect the multi-field coupling behavior of the composites.3.The bending deformation behavior of piezoelectric magnetic piezoelectric semiconductor composite structures under static magnetic field is investigated.It is found that the magnetic field can linearly regulate the properties of the composites,overlarge initial carrier concentration will limit the piezoelectric effect of the piezoelectric semiconductor materials,the composite has the best mechanical and electrical coupling properties when the piezomagnetic layer accounts for about 70% of the total thickness.4.Aiming at the bending deformation behavior of piezomagnetic-piezoelectric semiconductor composite material under harmonic magnetic field,the analytical solutions of physical quantities of the composite material under forced vibration in magnetic field are studied theoretically.The effects of magnetic field amplitude,carrier concentration and thickness ratio on the multi-field coupling performance of the composite under harmonic magnetic field are analyzed.