Mechanical APDL Structural Analysis Guide

8.4.1.10. Swelling

Certain materials respond to neutron flux by enlarging volumetrically, or swelling. T o include swelling
effects, initialize a material data table for swelling (TB,SWELL) and define the swelling constants (TBDATA).

Several swelling model options (TB,SWELL,,,,TBOPT) are available, including a user-defined option (via
subroutine userswstrain, described in Guide to User-Programmable Features).

Example 8.1: Defining Linear Swelling with Two Temperatures

!define elastic properties

mp,ex,1,20.0E5 !elastic properties

mp,nuxy,1,0.3

tb,swell,1,2,1,linear !define linear swelling option with two temperatures

tbtemp,25

tbdata,1,0.1e-5

tbtemp,100

tbdata,1,0.2e-5

For more information about using the TB,SWELL and the TB family of commands to input constants
for the swelling equations, see Swelling in the Material Reference.

Swelling can also be related to other phenomena, such as moisture content. The commands for defining
nuclear swelling can be used analogously to define swelling due to other causes.

8.4.1.11. User-Defined Material Model

The User-Defined material model (TB,USER) describes input parameters for defining your own material
model via the UserMat subroutine.

For more information about user-defined materials, see User-Defined Materials, and Subroutine UserMat
(Creating Your Own Material Model) in the Guide to User-Programmable Features.

8.4.2. Material Model Combination Examples.

You can combine several material model options to simulate complex material behaviors.Material
Model Combinations presents the model options you can combine along with the associated TB com-
mand labels and links to example input listings.

The following example input listings are presented in sections identified by the TB command labels.
8.4.2.1. RATE and CHAB and BISO Example
8.4.2.2. RATE and CHAB and MISO Example
8.4.2.3. RATE and CHAB and PLAS (Multilinear Isotropic Hardening) Example
8.4.2.4. RATE and CHAB and NLISO Example
8.4.2.5. BISO and CHAB Example
8.4.2.6. MISO and CHAB Example
8.4.2.7. PLAS (Multilinear Isotropic Hardening) and CHAB Example
8.4.2.8. NLISO and CHAB Example
8.4.2.9. PLAS (Multilinear Isotropic Hardening) and EDP Example
8.4.2.10. MISO and EDP Example
8.4.2.11. GURSON and BISO Example
8.4.2.12. GURSON and MISO Example
8.4.2.13. GURSON and PLAS (MISO) Example
8.4.2.14. NLISO and GURSON Example
8.4.2.15. RATE and BISO Example

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Nonlinear Structural Analysis