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完成了单个冲击对１Ｃｒ１８Ｎｉ９Ｔｉ不锈钢管道焊接头试样低周疲劳寿命影响的试验研究。单个试验最大瞬时峰值应变率达４８０ｓ－１ 。试样未经消除焊接残余应力。采用成组法试验 （每组７个试样）， 对称加载模式，总应变幅为０．００２２８。结果表明， 冲击影响受到焊接残余应力和冲击塑性导入机制的耦合作用。焊接残余应力与冲击应力叠加将增加材料损伤， 而冲击塑性导入将减缓疲劳损伤和降低疲劳寿命分散性。前者扼制后者。考虑疲劳寿命的分散性， 建议基于概率的冲击影响评价方法。试验结果的分析验证了方法的有效性
The impact of single impact on the low cycle fatigue life of 1Cr18Ni9Ti stainless steel welded pipe specimens was completed. The maximum instantaneous peak strain rate for a single test is 480s-1. Sample without welding residual stress. Group method test (7 samples per group), symmetric loading mode, the total strain amplitude of 0.00228. The results show that the impact is affected by the coupling between the welding residual stress and the impact plasticity introduction mechanism. The superposition of welding residual stress and impact stress will increase the material damage, while the impact plasticity introduction will slow the fatigue damage and reduce the fatigue life dispersion. The former controls the latter. Considering the dispersion of fatigue life, it is suggested to evaluate the impact impact based on probability. The analysis of the test results verify the effectiveness of the method