iter structural design criteria for in-vessel components (sdc-ic)

ITER G 74 MA 8 01-05-28 W0.2
Figure BÊ2752-1: Original Cycles
Example of rule #1. Observe that Cycle 1 has a strain range of (50 + 10) = 60.
Cycle 2 has a strain range of (15+30) = 45. In accordance with rule #1 above,
however, a larger strain range (50 + 30) = 80 can be obtained by combining the
positive half of cycle 1 with the negative half of cycle 2. This gives combined
cycle 1Õ shown below.
Example of rule #2. Observe that the number of cycles of type 1 is 1000 and the
number of type 2 is 10,000. In accordance with rule #2, the number of cycles of
type 1Õ should be the smaller of these, or 1000. This leaves 10000 - 1000 - 9000
cycles of type 2Õ, as shown below.
Example of rule #3. The concatenation of original cycles 1 and 2 gives a variation
+50, -10, +15, -30. The combination of these in accordance with the above,
resulted in 1000 cycles with range +50 to -30. To account for the intermediate
maxima and minima, 1000 additional cycles with range +15 to -10 must be
included. These are the type 3Õ cycles shown below.
Figure BÊ2752-2: Combined Cycles
A generalization of the above procedure can be expressed as follows. In a history of random
cycles, select the first composite cycle as one having the maximum strain and the minimum
SDC-IC, Appendix B. Guidelines for Analysis page 18