Studies on the Thermodynamic Properties of C/ph Irradiated by Intense Electron Beams

Abstract

The thermal shock wave and blow-off impulse are important phenomena of the thermodynamic effects produced in material bombarded by electron beams. The experimental results of the blow-off impulse in an improved carbon fiber-reinforced phenolic material (referred to, in short, as C/ph) exposed to intense electron beams are presented. Used to generate electron beams, the “FLASH II” accelerator has energy fluences ranging from 150 to 350 J·cm−2, and average energies of 0.5 or 0.6 MeV. The experimental results showed that the coupling coefficient of the blow-off impulse of C/ph was 0.42 ± 0.02 Pa∙s/(J·cm−2). The thermal shock waves and the blow-off impulse were numerically calculated separately by using a one-dimensional elastic–plastic hydrodynamic model. Attenuating with propagating distances, the peak values of the thermal shock waves during experiments were 0.6~1.5 GPa at the location of x = 8 mm in targets. The results of the numerical calculations were in good agreement with experimental data. The results obtained provide a basis for nuclear hardness and survivability assessments of aerospace.