块谱内部载荷排序对结构疲劳寿命的影响

Effect of Internal Load Order of Block Spectrum on Structural Fatigue Life

载荷次序的影响一直是疲劳累积损伤研究的热点话题,载荷的大小、级数、块谱外载荷次序及块谱内载荷次序的影响规律亟待探究。选取3种载荷范围,并按线性将其分为4、10、100级谱块与4、10、100级单峰值排序。通过线性累积损伤理论和两种经典非线性累积损伤理论,对以上各种情况进行累积损伤计算,得出载荷排序对载荷大小、级数、谱块内部、单级载荷次序的影响规律。

The influence of load order has been a hot topic in the study of fatigue cumulative damage.The influence of load size,order,spectral block load order,and single-stage load order need to be explored.Three load ranges were selected,sorted into linear blocks in order of 4,10,and 100,and in the same order,single peaks were arranged according to linearity.Based on the linear cumulative damage theory and two classic nonlinear cumulative damage theories,the cumulative damages were caculated for each of the above cases,thus abtaining the influence rules of the load size,the number of stages,the inside of the spectral block,and the order of the single-stage load in the load order.