The dielectric elastomer will deform under the action of electric field. Strong electric field should be applied to the dielectric elastomer to obtain high deformation energy

which may lead to electric-mechanical instability. In this paper

the electric-mechanical coupling behavior of photo-thermal sensitive dielectric gel was studied. Based on the theory of thermodynamics and continuum mechanics

the electric-mechanical coupling deformation theory of photo-thermal sensitive dielectric gel was established

the effects of temperature

light intensity and pretension on the electric-mechanical coupling deformation behavior of photo-thermal sensitive dielectric gel were studied. The results show that: In the absence of pretension

the electric-mechanical instability will occur finally with the increase of electric field intensity

and the smaller the light intensity and the lower the temperature is

the higher the critical electric intension is; Pretension can improve the electric-mechanical stability of photo-thermal sensitive dielectric gel. With equal biaxial pre-stretching

the extension rate in the direction of gel thickness decreases significantly

the nominal electric field strength increases linearly with the increase of nominal electric field.