Research on In-Pile Thermal-Mechanical Behavior of UMo/Zr Monolithic Fuel Plates

UMo/Zr monolithic fuel plates experience complex multi-field-coupling and multi-scale behavior during the in-pile radiation.In this study,the method of multi-scale simulation of the in-pile behavior in the UMo/Zr monolithic fuel plate under a homogeneous irradiation condition is built.The distributions and evolutions of the temperature field,the strain field and stress field,and the interfacial stress between the cladding and the fuel meat are calculated and analyzed.The research results indicate that the peak temperature increases with the irradiation time,the thickness of the plate increases with the irradiation time,and the peak value occurs near the edge of the fuel meat; the Mises stress in the fuel meat is far less than that in the cladding; and the maximum interfacial normal stress is located near the corner of the fuel meat,where the tensile stress may cause interfacial failure.