Study On Mechanical Property Modeling Of Dielectric Elastomer

Dielectric elastomer is a kind of insulated foil-formed plastic, belongs to the iron elastomers. It has characteristics of high-elasticity, light in weight, high-efficiency, anti-vibration, and likes animal muscle, etc. Because dielectric elastomers can produce a great extent of deformation, when put them into a DC electric field sandwiched between two compliant electrodes, they have the possibility, to be taken as ideal materials of actuators in MEMS, even as basic materials of artificial muscle. Dielectric elastomer is also one of the best material of the flexible micro drives, which have great potential in the field of medical treatment, bionics machine micro-drives, sensors and so on. The study on dielectric elastomers is just now started in our country.The mechanical property modeling of dielectric elastomer was discussed in this thesis. The mechanical behavior in uniaxial stretching of dielectric elastomers was tested by engineering measurement, to get data about the relationship between stress and strain. Dielectric elastomers belong to hyperelastic material with large deformations, the data was fitted into superelasticity models base on ANSYS, and determined that, Mooney-Rivlin model with five or nine parameters and Ogden model with three orders are suited the mechanical property of dielectric elastomers. According to the non-linear mechanical theory, the formula used in calculation of engineering tensile force of dielectric elastomers was derived, and the validity of the formula was proved by the experimental data. All of these experiments and analyses revealed further the character of DE and established the foundation for the design of elements made of DE.