关键词: 弹簧, 对数函数, 累积损伤理论, 疲劳, 损伤变量, 损伤因子, 残余应力, 超声检测, 焊接接头, 相位-频率关系

Abstract: On the basis of failure analysis, the fatigue cumulative damage of ammunition feeding springs in medium calibre automatic naval gun has been studied and the semi-empirical formula of fatigue life prediction is given by the logarithmic cumulative damage theory. The general, processes of fatigue life prediction under cyclic stress of varying amplitude are discussed.

Key words: 弹簧, 对数函数, 累积损伤理论, 疲劳, 损伤变量, 损伤因子, Phase-Frequency relationship, Residual stress, Welded joints, Ultrasonic testing