疲劳分析的疑问
各位，我刚开始学疲劳分析，碰到一些问题，希望各位高手不吝赐教。我分析的结构就是接管补强，定义了4个载荷步。
第一个载荷步不需要进行疲劳分析，2、3、4载荷步需要分析
我现在首先定义疲劳位置，在存储应力的时候有from rst file，我想问一下如果我读入第二步结果，此时在存储应力对话框中的loading number应该是几？当读入第三步载荷步时该值又应该是几？该loading number和我前面定义的load step有什么区别？
我试验了一下单独进行第二载和步的分析，loading number无论我用2和1计算结果都一样？
但是我想把三个载荷步共同的疲劳计算出来，具体应该如何定义？ 还有一个奇怪的事，我明明定义了3个事件，循环次数分别是6000，6000，20。
为什么结果出来有两个合适，另外一个6000的居然变成5980次了。
更可笑的是，前后两次载荷事件都不对，温度也只有两个，
PERFORM FATIGUE CALCULATION AT LOCATION 1 NODE 0
*** POST1 FATIGUE CALCULATION ***
LOCATION 1NODE 228
EVENT/LOADS 1 1 AND 3 4
PRODUCE ALTERNATING SI (SALT) = 96.741 WITH TEMP = 20.000
CYCLES USED/ALLOWED =20.00 / 0.4203E+06 = PARTIAL USAGE = 0.00005
EVENT/LOADS 2 1 AND 2 3
PRODUCE ALTERNATING SI (SALT) = 62.822 WITH TEMP = 50.000
CYCLES USED/ALLOWED =6000. / 0.1000E+07 = PARTIAL USAGE = 0.00600
EVENT/LOADS 1 1 AND 1 2
PRODUCE ALTERNATING SI (SALT) = 37.693 WITH TEMP = 155.00
CYCLES USED/ALLOWED =5980. / 0.1000E+07 = PARTIAL USAGE = 0.00598
CUMULATIVE FATIGUE USAGE = 0.01203
后面做的一个
PERFORM FATIGUE CALCULATION AT LOCATION 0 NODE 228
*** POST1 FATIGUE CALCULATION ***
LOCATION 1NODE 228
EVENT/LOADS 1 2 AND 3 1
PRODUCE ALTERNATING SI (SALT) = 96.741 WITH TEMP = 20.000
CYCLES USED/ALLOWED =20.00 / 0.4203E+06 = PARTIAL USAGE = 0.00005
EVENT/LOADS 1 2 AND 2 1
PRODUCE ALTERNATING SI (SALT) = 62.822 WITH TEMP = 50.000
CYCLES USED/ALLOWED =5980. / 0.1000E+07 = PARTIAL USAGE = 0.00598
EVENT/LOADS 2 1 AND 2 2
PRODUCE ALTERNATING SI (SALT) = 62.822 WITH TEMP = 50.000
CYCLES USED/ALLOWED =20.00 / 0.1000E+07 = PARTIAL USAGE = 0.00002
CUMULATIVE FATIGUE USAGE = 0.00605
我都崩溃了。 在后面做的那个疲劳里面当我把事件3和事件2删除单独计算时，却能把事件1计算出来
PERFORM FATIGUE CALCULATION AT LOCATION 0 NODE 228
*** POST1 FATIGUE CALCULATION ***
LOCATION 1NODE 228
EVENT/LOADS 1 1 AND 1 2
PRODUCE ALTERNATING SI (SALT) = 37.693 WITH TEMP = 155.00
CYCLES USED/ALLOWED =6000. / 0.1000E+07 = PARTIAL USAGE = 0.00600
CUMULATIVE FATIGUE USAGE = 0.00600
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