Influence of mechanical stresses on the coefficient of thermal expansion of polymerized steel-filled epoxy resin

It has been experimentally shown that the standard theory of thermoelasticity cannot describe the dependence of laser-excited acoustic vibrations on stress in an epoxy composite with a conductive filler. To explain the data obtained, a theoretical model of thermoelasticity was used, which takes into account the thermal perturbation of non-stationary defect states with relaxation. The proposed model also takes into account the change in electron gas pressure due to the excitation of defects in metals. It is shown that the dynamic coefficient of thermal expansion in this material is determined primarily by the conductive component.