Environmental Engineering Reference
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600
6
400
4
3
5
200
Drain
1
0
2
-200
0
2
4
6
8
10
12
Elapsed time, t (sec)
Figure 12-6. Schematic diagram of a fatigue load-time series in which cycles are counted
by the rainflow algorithm, using the “drain” method. [Cosmos 2005]
Table 12-2.
Fatigue Load Parameters for the Time-Sequence in Figure 12-6,
by the Rainflow Counting Algorithm
Cycle
Minimum Load,
L min (kN-m)
Maximum
Load, L max
(kN-m)
Average Load,
L avg (kN-m)
Cyclic Load,
L cyc (kN-m)
R-Ratio
1
-200
600
200
400
- 3.00
2
-100
0
-50
50
0
3
200
400
300
100
+ 2.00
4
200
500
350
150
+ 2.50
5
200
300
250
50
+ 1.50
6
400
500
450
50
+ 1.25
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