Numerical Simulation of Thermal Shock Waves Induced by Pulsed X-ray in C/PF Materials

Abstract

Based on the orthotropic elastoplastic constitutive model of carbon-phenolic (C/PF) material under three-dimensional strain, a self-developed explicit finite element program TSHOCK3D is developed to simulate the multi-physical coupling process of thermo-mechanical response of C/PF target irradiated by pulsed X-rays. Two typical irradiation conditions are simulated, namely blackbody temperatures 1keV soft X-ray and 3keV hard X-ray with the same energy flux of 300J/cm2 and pulse width of 100ns. The C/PF target presents two different thermodynamic patterns. Compared with 3keV hard X-ray, 1keV soft X-ray has a shallower energy deposition depth and a higher peak pressure of thermal shock waves. Furthermore, the irradiated surface under 1keV X-ray exhibits the phenomenon of vaporization while 3keV does not. Following the compression wave is a tensile rarefaction wave, the peak pressure of which is higher in the case of the 1keV. In addition to the phase transition and shock wave propagation in the direction of irradiation, the tensile fracture phenomenon appears in the side area of the target plate, and the effect is more significant under the irradiation of 3keV.