关键词: 乏燃料后处理, Johnson-Cook模型, 不锈钢管, 剪切, 剪切力, 工艺参数

Abstract: Shearing was a key part of the spent fuel reprocessing processes. Due to the strong irradiation constraints, there were few studies on the shearing processes. The parameters of shearing processes needed to be optimized by a large number of experiments. But the high cost, the long experimental cycle and complex shear mechanism made it unaccessible. The stainless steel tubes, the main support structures of spent fuel assemblies, were introduced as the research object and based on Johnson-Cook model the finite element numerical simulation method was used to analyze the shearing processes. The shear test was designed to verify the correctness of the previous model, and the effects of process parameters such as shear clearance, tool angle and tool edge width on shearing processes. The results show that the shear test and the simulation of model have good fitting performance, which proves the correctness of the model. The maximum shear forces and shear forces during fracturing are positively related with the augment of shear clearance and edge width, and the decreases of tool angle. The shear clearance has a great influence on the fracture morphology of the compression sections, and the tool angle and the edge width have a great influence on the opening width of the separation sections.

Key words: spent fuel reprocessing, Johnson-Cook model, stainless steel tube, shear, shear force, process parameter