Study On Force - Electric - Magnetic Coupling Field Based On PVDF Composites

PVDF as a typical piezoelectric materials to form composite materials with a variety of ferromagnetic materials, because of PVDF composite material not only has good piezoelectric, dielectric properties and electric properties of iron, and can have excellent magnetic; Its advantages compared with traditional material are very obvious, which makes the PVDF composite in information technology, nondestructive inspection, intelligent materials such as emerging in the field of science and technology has a broad application prospect.And we should see the problems at the same time, the performance of the coupling field of study is very lack, want to express a coupling field is very complicated, so we need to use a certain mathematical methods by related equation is derived to describe the coupling action between the relationship. So the paper composite piezoelectric constitutive equation was deduced and coupling equations, etc. In addition, PVDF composite material has very good ferroelectricity and ferromagnetism, therefore has the strong ability of electromagnetic coupling, so the thesis expounds the coupling characteristics of the electromagnetic and analysis, combining the piezoelectric equation is deduced, further derived the PVDF composite force-electric-magnetic coupling constitutive equation. To facilitate the finite element analysis, and ultimately turn coupled equation for structural dynamics equation. Later, for the coupling mechanism of PVDF composite analysis of the work, the article USES the finite element method, through the ANSYS finite element analysis software, discusses PVDF composite materials under the action of force field and electric field of the coupling behavior. Then analyzes the PVDF composite material in magnetic, and under the action of coupling field around the degree of change, and its changes and force electric coupling degrees around the comparison, further analyzing the coupling field properties of PVDF composite materials.In the thesis, through from the perspective of the actual test, further explore the magnetic field and force field, under the action of electric field coupling for PVDF composite materials. Set up the experimental platform, the data acquisition system, filter amplifier circuit was designed, and the experimental results are analyzed. Analysis results show that with the introduction of magnetic field, PVDF composite diaphragm piezoelectric performance would be affected.