In this paper, thermal dynamic stability analysis of sandwich microbeams made of a honeycomb core and piezoelectric and porous visco graphene sheets resting on visco Pasternak is studied. The microbeam is modeled based on the zigzag theory and in order to incorporate the size effect, strain gradient theory is utilized. The set of the governing equations are derived Hamilton’s principle and are solved numerically using Galerkin method. The influences of various parameters on the thermal dynamic stability characteristics of the sandwich nanobeam are investigated including small scale, temperature changes, core to face sheets thickness ratio, intensity of electric fields and stiffness of elastic medium. The results of present work can be used to optimum design and control of micro-thermal/electro-mechanical devices. تفاصيل المقالة