In this paper, a thermo-mechanical model suitable for the interpretation of laser heating experiments simulating the power increasing phase of a RIA transient on UO${}_2$ samples is detailed. The thermal model includes a description of the heat deposition on the sample surface and of the heat transfer within the thickness and radius of the UO${}_2$ sample. The mechanical model describes cracking and crushing of the material depending on the loading mode (tension or compression dominated) and on temperature. The brittle - ductile transition in compression is in particular well reproduced. The parameters fitting is based on available uniaxial compression tests performed at high strain rates and on bending tests performed at moderate strain rates. The application of the mechanical model to annular laser heating experiments led to a good estimation of the crushing and cracking location (near the sample periphery), of the crack orientation (circumferential) and of the beginning of cracking.

在本文中，一种适用于解释激光加热实验的热机械模型模拟了 UO 上 RIA 瞬态的功率增加阶段${}_2$样品很详细。热模型包括对样品表面热沉积和 UO 厚度和半径内的热传递的描述${}_2$样本。机械模型根据加载模式（以拉伸或压缩为主）和温度来描述材料的开裂和压碎。压缩中的脆-韧转变特别好再现。参数拟合基于在高应变率下进行的可用单轴压缩试验和在中等应变率下进行的弯曲试验。将机械模型应用于环形激光加热实验，可以很好地估计破碎和开裂位置（靠近样品外围）、裂纹方向（圆周）和开裂开始。