Page 47 - Using ANSYS for Finite Element Analysis Dynamic, Probabilistic, Design and Heat Transfer Analysis

34 • using ansys for finite eLement anaLysis
TBTEMP,,CRIT ! Failure criterion key
TBDATA,2,1 ! Maximum Stress Failure Criterion (Const. 2 =
1) TBTEMP,100! Temperature for subsequent
failure properties TBDATA,10,1500,,400,,10000
! X, Y, and Z failure tensile stresses (Z value!
set to a large number)
TBDATA,16,200,10000,10000 ! XY, YZ, and XZ failure shear
stresses
TBLIST
TBTEMP,200! Second temperature
TBDATA,...

The FC → commands → are FC, FCDELE, and FCLIST commands:
Main Menu> Preprocessor> Material Props>
Material Models> Structural> Nonlinear> Inelastic>
Non-Metal Plasticity> Failure Criteria
Main Menu> General Postproc> Failure Criteria
A typical sequence of commands to specify a failure criterion using
these commands is shown as follows.

FC,1,TEMP,, 100, 200 ! Temperatures
FC,1,S,XTEN, 1500, 1200 ! Maximum stress components
FC,1,S,YTEN, 400, 500
FC,1,S,ZTEN,10000, 8000
FC,1,S,XY , 200, 200
FC,1,S,YZ ,10000, 8000
FC,1,S,XZ ,10000, 8000
FCLIST, ,100 ! List status of Failure Criteria at 100.0 degrees
FCLIST, ,150 ! List status of Failure Criteria at 150.0 degrees
FCLIST, ,200 ! List status of Failure Criteria at 200.0 degrees
PRNSOL,S,FAIL ! Use Failure Criteria

The TB commands (TB, TBTEMP, and TBDATA) can be used only
for SHELL91, SHELL99, SOLID46, or SOLID191, but the FC and
FCLIST commands can be used for any 2-D or 3-D structural solid element
or any 3-D structural shell element. See the ANSYS Commands Reference
for a discussion of the TB, TBTEMP, TBDATA, TBLIST, FC, FCDELE,
and FCLIST commands. Some notes about specifying failure criteria:

• The criteria are orthotropic, so you must input the failure stress or
failure strain values for all directions. (The exception is that com-
pressive values default to tensile values.)