Mechanical APDL Basic Analysis Guide

• It is available only for current-technology elements. Initial state supported for a given element is indicated
  in the documentation for the element under “Special Features.”


• Node-based initial state is not supported for the following current-technology elements:REINF263,REINF264,
  REINF265,SOLID272,SOLID273,ELBOW290.

For user-defined data types, however, support for node-based initial state is available for these ele-

ments:SOLID272,SOLID273,ELBOW290.

The following initial state material limitations apply:

• It is not supported for use with kinematic hardening material properties (TB,BKIN,TB,KINH,TB,PLAS,,,,KINH).


• Initial state with initial stress alone is not supported for gasket materials (TB,GASK).


• Initial state with initial elastic strain alone is not supported for gasket materials (TB,GASK) and hyperelastic
  materials (TB,HYPER,TB,BB,TB,AHYPER,TB,CDB,TB,EXPE).


• Initial state with plastic strain (which must include initial strain or stress, plastic strain, and accumulated
  plastic strain) does not support gasket materials (TB,GASK), porous media (TB,PM), rate-dependent plasticity
  (TB,RATE), and viscoplasticity (TB,PRONY,TB,SHIFT ).


• Initial state with field variables is not supported for fracture calculations initiated via the CINT command.

4.6. Example Problems Using Initial State

This section provides examples of typical initial state problems, as follows:

4.6.1. Example: Initial Stress Problem Using the IST File

4.6.2. Example: Initial Stress Problem Using the INISTATE Command

4.6.3. Example: Initial Strain Problem Using the INISTATE Command

4.6.4. Example: Initial Plastic Strain Problem Using the INISTATE Command

4.6.5. Example: Initial Creep Strain Problem Using the INISTATE Command

4.6.6. Example: Initial Plastic Strain Problem Using the INISTATE with State Variables

4.6.7. Example: Node-Based Initial Strain Problem Using the INISTATE Command

4.6.1. Example: Initial Stress Problem Using the IST File

The following example initial stress problem shows how to define an initial stress file and use the
INISTATE,READ command to read the data into your analysis.

The following file contains the initial stresses to be read into ANSYS. Each element has eight integration
points in the domain of the element.

/CSYS,0

! ELEM ID ELEM INTG LAY/CELL SECT INTG SX SY SZ SXY SYZ SXZ

1 , 1, 1 1 100, 0, 0, 0, 0, 0

1 , 2, 1 1 100, 0, 0, 0, 0, 0

1 , 3, 1 1 100, 0, 0, 0, 0, 0

1 , 4, 1 1 100, 0, 0, 0, 0, 0

1 , 5, 1 1 100, 0, 0, 0, 0, 0

1 , 6, 1 1 100, 0, 0, 0, 0, 0

1 , 7, 1 1 100, 0, 0, 0, 0, 0

1 , 8, 1 1 100, 0, 0, 0, 0, 0

Release 15.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information

Example Problems Using Initial State