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

ITER G 74 MA 8 01-05-28 W0.2
BÊ3024.2.1 Use of the tensile curve
To characterize the stress-strain response, this elasto-plastic model makes use of a Òminimum
tensile curve,Ó expressed as a relationship between the stress s* and the cumulative plastic
strain e p * at a given temperature. This relationship is obtained by subtracting the elastic
strain from the total strain of the tensile curve as shown in Figure BÊ3024-1 (below). The
minimum (lower bound) tensile curve is used to obtain a conservatively high estimate of the
plastic strain.
*
The curve ( s*; ep)
represents the strain hardening behaviour of the material. s* depends
*
on the current strain hardening state as represented by the cumulative plastic strain ep . In the
initial virgin state of the material, e p * = 0, s* equals the initial yield stress.
SDC-IC, Appendix B. Guidelines for Analysis page 30