Thermal treatment improvement and energy harvesting capability promotion of a rotating piezoelectric aggregated CNT-reinforced beam-like structure resorting to an auxetic lamina

Abstract

Numerous examinations have demonstrated the shortage of CNT-strengthened structures encountering a thermal ambient. In this paper, for the first time a multi-layered nanocomposite structure is suggested for the sake of improving the thermal response as well as energy harvesting capability of a rotating nanocomposite beam. In line with these promotions a honeycomb layer is integrated to a rotating CNT-aggregated beam with two piezoelectric laminae. The linearized equations of motion are projected into the prestressed configuration for the sake of study the linear free vibrations and the static instability of the rotating beam. The results elucidate how effectively the critical temperature results into the buckling of the rotating nanocomposite beam improves. It is confirmed that a simply-supported non-aggregated beam rotating at 1500 rpm with a core layer composed of an 80% auxetic core and 20% nanocomposite in its height with the honeycomb angle −20o has the first natural frequency 2.89 % smaller than the associated beam with a 100% nanocomposite core layer in the room temperature while the former weighs 22.05 % less than the latter. Meanwhile by the elevation of the room temperature by 10 K the first natural frequency of the former is 139.53 % larger than the latter. Moreover, the voltage observed by the sensor layers develops as a result of the enlargement of the absolute value of the honeycomb angle. It is confirmed that for a rotating simply-supported beam making the advantage of an auxetic core with the angle of −65o a higher voltage is detected by the magnification factor of 31.6 % relative to a regular honeycomb with the angle of 65o. On the other hand, the increment of the rotational speed from 1500 rpm to 2500 rpm induces a higher voltage by the magnification factor of 177.8 %. Accordingly, for the purpose of energy harvesting a rotating auxetic PZT-CNT beam with the maximum absolute angle is proposed.