Hashemi M. Thermomechanical stability and fatigue behavior of the viscoelastic thin–wall nanocomposite structural elements under static and cyclic loading.

elements made from polymer–based nanocomposite reinforced by nanofibers under combined monotonic and harmonic loading. To predict the time dependent and inelastic response of polymer matrix, a semi empirical phenomenological model based on Goldberg model is applied. The effect of nanofiber on the overall effective inelastic response of polymer–based nanocomposite is carried out by using developed homogenization approach. In doing so, the Mori–Tanaka method with appropriate modifications accounting for influence of the fiber–matrix interface have been utilized. The frequency, temperature and amplitude dependent complex moduli are used to describe the cyclic response of the material as well as for investigating the influence of dissipative heating on the mechanical and thermal stability and fatigue behavior of structural elements (rod, beam and plate) made from polymer–based nanocomposite materials reinforced by carbon nanotube (CNT) fibers under static and monoharmonic loading. For this purpose, the monoharmonic approximation formulation of thermoviscoelasticity coupling problem has been developed with taking into account the effect of the geometrical and physically nonlinearity. The influence of orientation and the volume fraction of nano fibers on the dynamic characteristics and temperature of vibration heating of polymer–based nanocomposite elements are investigated.