The Numerical Simulation On Thermal-mechanical Effects Of 45~# Target Irradiated By High-intensity Pulsed Ion Beam

The high intensity pulsed ion beams (HIPIB) is the metal surface modification technology that the material irradiated by high-power ion beam, high power-density is deposited on the material surface in a short time, then the material surface melt, evaporation, thermal-stress, shock wave occurred because of prompt heating and cooling. The results showed that surface layer structure, microstructure, surface rigidity, resist abrasion and resist corrosion improved. Because of being have many advantages for high intensity pulsed ion beams, it has been pay more attention to the field of materials.In order to study the thermal-mechanical effect on metal surface irradiated by high intensity pulsed ion beams, energy disposition distribution was calculated after the interaction of high intensity pulsed ion beams with target made a discussion in theory, then a model for the interaction of high intensity pulsed ion beams with target is described. Based on thermal-mechanical equation, the thermal-mechanical effects on the target surface irradiated by HIPIB with different power density is simulated using the ABAQUS software. Heat Flux Mode using Element removed and reactivated method imitating the vaporized material is built to simulate target surface irradiated by HIPIB.The thermal-mechanical effects on the target irradiated by the HIPIB are simulated numerically. The calculation results, such as temperature field, temperature gradient distributions, stress and shocks are discussed. It has been shown that it has a great change of temperature and stress on metal surface in a short time. The simulation shows that, current density is the main factor which influents the temperature increasing velocity during the irradiated state, and the change of pulse voltage doesn't change the heating rate markedly. With the increasing of the current density, the temperature gradient in the irradiated direction is getting higher. Irradiated with high power density, the target surface and inner material vaporized almost simultaneously, and had a great change of stress, therefore, form a crater on the target surface.Experiment indicates that, after irradiated by HIPIB, the honeycomb appearance has appeared on the target surface, and the hardness of honeycomb is increased clearly, this phenomenon agrees well with the simulation result, and the increase of pulse frequency leads different appearance.