ABAQUS Volume II: I–Z - Manual (Page 227)

*ORNL
15.2 *ORNL: Specify constitutive model developed by Oak Ridge National Laboratory.
This option is used to provide plasticity and creep calculations for type 304 and 316 stainless steel according
to the specification in Nuclear Standard NEF 9–5 T, “Guidelines and Procedures for Design of Class I
Elevated Temperature Nuclear System Components.” It can be used only with the *PLASTIC option and/or
the *CREEP, LAW=STRAIN option.
Product: ABAQUS/Standard
Type: Model data
Level: Model
Reference:
•
“ORNL – Oak Ridge National Laboratory constitutive model,” Section 18.2.12 of the ABAQUS Analysis
User’s Manual
Optional parameters:
A
Set this parameter equal to the saturation rates for kinematic shift caused by creep strain, as defined
by Equation (15) of Section 4.3.3–3 of the Nuclear Standard. The default value is 0.3, as per that
section of the Standard. Set A=0.0 to use the 1986 revision of the Standard.
H
Set this parameter equal to the rate of kinematic shift with respect to creep strain [Equation (7) of
Section 4.3.2–1 of the Nuclear Standard]. Set H=0.0 to use the 1986 revision of the Standard. If
this parameter is omitted, the value of H is determined according to Section 4.3.3–3 of the 1981
revision of the Standard.
MATERIAL
Set MATERIAL=SS to use the hardening law appropriate to either type 304 or type 316 stainless
steel. This is the only option presently available and, thus, the default.
RESET
Include this parameter to invoke the optional reset procedure described in Section 4.3.5 of the
Nuclear Standard. If this parameter is omitted, the reset procedure is not used.
There are no data lines associated with this option.
15.2–1
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