Thermo-mechanical Effects Of Multi-target To Pulsed Electron Beam

When radiated by pulsed electron beam, the target will have thermo-mechanical effects such as blow-off impulse and thermal shock wave. The research of the effects is of great value though it is very difficult, especially when the target has a multi-structure.This thesis is mainly on the thermo-mechanical effects of multi-target to pulsed electron beam. The primary contents are as follow:(1) The interaction between electron and the materials'atom is introduced. The formula of calculating the blow-off impulse and the method to simulate the thermal shock wave in multi-target are put forward.(2) Based on the program SANDYL which is used to calculated the energy deposition and program DRAM1D which is used to calculated the blow-off impulse and thermal shock wave, a software Pro-DRAM is made to simulate the thermo-mechanical effects of multi-target to pulsed beam.(3) A constitutive formula which is from the experimental results of SHPB and the radius regression method is used to describe the propagation of thermal shock wave in Al alloy. By comparing the numerical results with the experiment datum obtained in REB device and the numerical results obtained with ideal elastic-plastic constitutive model, this method is proved better to describe the propagation of thermal shock wave in Al alloy generated by electron beam radiating.(4) The sublimation energy is a key material parameter in the materials dynamics under pulsed beam radiation, but it is difficult to be measured experimentally. So a new method to determine the sublimation energy of materials by using the experimental data of blow-off impulse induced by electron beam and the computer program Pro-DRAM is proposed. With this method, the sublimation energy of polyester is finally determined about 1.1 kJ/g, and the sublimation energy of GB material is determined about 1.5 kJ/g.(5) By simulating the thermo-mechanical effects of C/Ph-Al-C/Ph-Al target and the MZ target to pulsed electron beam, the laws of energy deposition, blow-off impulse and thermal shock wave propagation in multi-target are concluded.