Fig. 1. Comparison of the calculated and experimental values of the UN creep model (a) and the U ₃Si ₂ creep model (b) (color online)

Fig. 2. Microstructure of UN-U ₃Si ₂ composite fuel pellets

Fig. 3. Flowchart diagram of random distribution modeling

Fig. 4. Schematic diagram of random distribution model

Fig. 5. Schematic diagram of periodic boundary conditions and applied loads for cube-shaped voxels

Fig. 6. Comparison of macroscopic equivalent creep strain with and without irradiation swelling

Fig. 7. Von Mises stress contourplots (section view) at the fission density of 4.32×10²⁷ fissions·m^-3 (a) With radiation swelling, (b) Without radiation swelling

Fig. 8. Equivalent creep contour plots (section view) at the fission density of 4.32×10²⁷ fissions·m^-3 (a) With radiation swelling, (b) Without radiation swelling

Fig. 9. Contribution of dispersed phase and matrix to total creep strain

Fig. 10. Proportions of different creep contribution