Study On The Effective Electro-elastic Modulus Of Piezoelectric Fiber Composites

With the development of material science, piezoelectric composite material has beenwidely used in the field of modern science and technology, it has become a kind ofimportant new material and structure. Force electric coupling characteristics ofpiezoelectric composites can be designed which overcomes the drawback of singlepiezoelectric material break easily, so the effective prediction of piezoelectric compositeselectric elastic properties is of great significance.Based on the representative volume element (RVE) as the research object, byapplying on material representative volume unit boundary displacement and electricpotential boundary conditions, the electroelastic fields in the RVE are obtained by thefinite element analysis. On the basis of the mean field theory, by the average electricelastic field and the definition of electricity elasticity performance effectively, researchincludes periodic distribution of piezoelectric fiber piezoelectric composite elasticperformance effectively.Respectively forecasts the square and hexagonal element model, the circular crosssection fiber and ring-shaped cross-section fiber of the effective electrical elasticitycoefficient of piezoelectric fiber composites. By numerical examples, the differences ofeffective electroelastic coefficients between composites with ring-shaped and circularcross-section piezoelectric fibers are demonstrated under the same piezoelectric materialvolume fraction, the effects of mechanical property of non-piezoelectric filling materialsinside the ring-shaped cross-section piezoelectric fibers on the effective piezoelectriccoefficients are discussed, compared the square and hexagonal model, the ring-shapedcross-section of the piezoelectric fiber composite material effective electrical elasticitycoefficient in different directions. The conclusions in present paper can provide valuablereferences for designing piezoelectric composites with high sensibility.