The Structure Of Advanced Blister Instrument And Electromechanics Behaviors Of Electromagnetic Materials Under Multicoupling Loading

With the advantages of electrical/mechanical magnetic conversion function and fastresponse speed, electromagnetic functional materials have been widely used in functionalcomponents, showing the vital significance to the development of high and newtechnology and the formation of new industry. The interface structure, strainmismatch, size effect and nonlinear response have important implications in performancedegradation and fracture damage failure. Thus, It is of great significance in researchingpreparation and characterization methods and developing more dynamic and static loadtesting technology.In this paper, On the basis of traditional methods for characterizing the bulge test, anew multi-field coupling loading bulge test method developed, electrical response force.the electric-mechanical properties of electromagnetic materials under electric-mechanicalcoupling are explored. The main research contents are summarized as follows.Firstly, the building and debuging of multifunctional bulge testing device. A new kindof bulge testing device is developed on the basis of traditional bulge device, two modulesare added into it: the ferroelectric hysteresis loop is measured by Sawyer-Tower circuit andthe magnetic hysteresis loop is measured by SMOKE(surface magneto-optic Kerr effect).In addition, a method of manufacturing magneto-electric film sample for bulge testing isinvented, makes it true to manage more intimate experiment, a China patents hasbeen applied.Secondly, the mechanical properties of PZT under different electric fileds is measured.As it turns out, the extra electric field have obvious influence of mechanical property inPZT. It is found that the deflection of PZT would not changed until the voltage increasesto150V, and the deflection decreased20.8%.Thirdly, the ferroelectric hysteresis loops of PZT and composite material PZT/Fecomposite material under different pressure are measured. For PZT, When the pressureincreases to the maximum400KPa, the maximum polarization decreases from0.152C/m2to0.064C/m2, with a decrease of58.1%, the remanent polarization decreases from0.117C/m2to0.044C/m2, a decrease of62.5%. The coercive field increases as the oil pressureincreased significantly, from521kV/m increase to617kV/m, with an increase of18.4%.For the composite material PZT/Fe, the ferroelectric hysteresis loop has the same trend, themaximum polarization and the remanent polarization decreases22.4%and32.1%,respectively. Forthly, the ferroelectric hysteresis loops of PZT and composite material PZT/Fecomposite material under different pressure are measured. When the magnetic field isperpendicular to the thickness direction, the change of the magnetic field almost has noeffect to the hysteresis loop. When the magnetic field is parallel to the thickness directionupward, the maximum polarization has gradually become larger, from0.15C/m2at0Oe to0.169C/m2at1000Oe, with a increase of12.7%, and the remanent polarization increasedto0.117C/m2from0.098C/m2, with a increase of19.4%, while the coercive fieldincreased to258kV/m from310kV/m, a increase of16.8%. When the magnetic field isparallel to the thickness direction downward, the maximum polarization has graduallybecome smaller, it decreases from0.175C/m2to0.15C/m2by about14.3%, and theremanent polarization drops from0.115C/m2to0.104C/m2, decreases approximately9.6%, while the coercive field increases to298kV/m from310kV/m, increasesapproximately18.3%.