As a crucial component of the spent fuel, the stainless steel thin-walled tube would be cut into segments with dozens of millimeters in length during the closed fuel cycle. The high ductility and malleability of the stainless steel material bring great challenges to shear tools. Thus, it is worthwhile to investigate the tube shearing process. However, currently, few research has involved the tube shearing process and no readily available model could be employed to predict accurately the tube shearing. To study the shearing process of tubes, an improved Gurson-Tvergaard-Needleman model was proposed to investigate the shearing process of tubes. The results show that the predicted shear forces match well with the experimental data. Moreover, the tube shearing process could be simplified into two cases in the closed fuel cycle, i.e. shearing tubes without a support block (case I) and shearing tubes with a support block (case II). By comparing the shearing process and damage evolution between the case I and case II, it is concluded that the support block plays a significant role in the shearing process and accelerates the damage evolution.

作为乏燃料的重要组成部分，不锈钢薄壁管在封闭的燃料循环过程中会被切成数十毫米长的段。不锈钢材料的高延展性和延展性给剪切工具带来了巨大挑战。因此，值得研究管剪切过程。然而，目前，很少有研究涉及管剪切过程，并且尚无可用的模型可用于准确预测管剪切。为了研究管材的剪切过程，提出了一种改进的Gurson-Tvergaard-Needleman模型来研究管材的剪切过程。结果表明，预测的剪切力与实验数据吻合良好。此外，在封闭的燃料循环中，可将管道剪切过程简化为两种情况，即 不带支撑块的剪切管（情况I）和不带支撑块的剪切管（情况II）。通过比较案例I和案例II之间的剪切过程和损伤演化，可以得出结论，支撑块在剪切过程中起着重要作用，并加速了损伤的演化。