Cold pilgering process is a seamless tube forming technology, in which the metal is subjected to a series of small incremental deformations. It has been extensively applied for the manufacturing of cladding tube in nuclear reactors, due to high dimensional accuracy and favorable texture evolution. Notwithstanding, the pilgered tubes showed a kind of shear cracks similar to those obtained during low-cycle shear fatigue experiments. To confirm it, a novel low-cycle shear fatigue experiment was designed, in which the shear stress amplitude was obtained from a tracking point in the inner surface of the pilgered tube through finite element model (FEM). Additionally, a theoretical model was established based on the experimental results to predict fatigue life during the cold pilgering process. Through this model, the effects of Q value, side relief, and friction coefficient on the safety factor during cold pilgering were investigated. The results showed that with the increase of Q value, and the decrease of the difference between the friction coefficients of the inner and outer surfaces, the safety of cold pilgering tube could be improved by decreasing the tendency of shear cracks.

冷轧工艺是一种无缝管成型技术，在该工艺中，金属经受一系列小的增量变形。由于尺寸精度高和质地演化良好，它已广泛应用于核反应堆包壳管的制造。尽管如此，pilgered 管显示出一种类似于在低周剪切疲劳实验中获得的剪切裂纹。为了证实这一点，设计了一种新的低周剪切疲劳实验，其中剪切应力幅值是通过有限元模型 (FEM) 从 pilgered 管内表面的跟踪点获得的。此外，基于实验结果建立了理论模型来预测冷轧过程中的疲劳寿命。通过这个模型，Q值的影响，侧浮雕，研究了冷轧过程中摩擦系数对安全系数的影响。结果表明，随着Q值的增大，内外表面摩擦系数差值的减小，冷轧管的安全性可以通过降低剪切裂纹的趋势来提高。