通过对螺旋埋弧焊接X70钢管焊缝金属进行疲劳试验，得到了不同应力幅和应力比下的疲劳寿命数据，对疲劳寿命的概率分布进行了分析；依据当量疲劳寿命公式，获得疲劳抗力系数和当量疲劳极限，并对其概率分布进行分析，进而建立了焊缝金属的P-S-N 曲线，给出了指定存活率下的疲劳寿命曲线。结果表明：焊缝金属的疲劳寿命服从对数正态分布，疲劳抗力系数服从对数正态分布，以当量应力表示的疲劳极限服从正态分布。
Fatigue tests were conducted on weld metal specimens cut from spiral submerge-arc welded X70 steel pipe.Fatigue life data at different stress amplitudes and stress rations were obtained.The probability distribution of these data was analyzed.Based on the equivalent fatigue life formula,values of fatigue resistant coefficient and equivalent fatigue limit were obtained and their probability distribution were also analyzed.The P-S-N curves of weld metal were built up.Fatigue life curves at given survivability were given.The results show that fatigue life of weld metal follows 1ogarithmic normal distribution,fatigue resistant coefficient follows logarithmic distribution and equivalent fatigue limit follows normal distribution.
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