 CRACK NAME

Set this parameter equal to a label that will be used to refer to the crack.
When the extended finite element method is used, set this parameter equal to
the name assigned to the enriched feature on the
ENRICHMENT option.
 CRACK TIP NODES

Include this parameter to indicate that the crack tip nodes are specified to
form the crack front line. If this parameter is omitted, the crack front line
will be formed along the first nodes of the crack front node sets. (The first
node will be the node with the smallest node number for each crack front node
set, unless the node set is generated as unsorted.)
This parameter is not relevant when the XFEM parameter is specified.
 DIRECTION

This parameter can be used only in combination with the TYPE=K FACTORS parameter.
Set DIRECTION=MTS (default) to choose the maximum tangential stress criterion.
Set DIRECTION=MERR to choose the maximum energy release rate criterion.
Set DIRECTION=KII0 to choose the ${K}_{II}=0$
criterion.
 FREQUENCY

Set this parameter equal to the output frequency, in increments. The output
will always be printed at the last increment of each step unless FREQUENCY=0. The default is FREQUENCY=1. Set FREQUENCY=0 to suppress the output.
 NORMAL

Include this parameter to indicate that the direction normal to the plane of
the crack $\mathbf{n}$ is specified. Omit
this parameter to indicate that the virtual crack extension direction
$\mathbf{q}$ is specified.
This parameter is not relevant when the XFEM parameter is specified.
 OUTPUT

If this parameter is omitted, the contour integral values will be printed in
the data (.dat) file but not stored in the results
(.fil) file.
Set OUTPUT=FILE to store the contour integral values in the results file.
Set OUTPUT=BOTH to print the contour integral values in the data file and to
store them in the results file.
 RESIDUAL STRESS STEP

Use this parameter to account for the effect of residual stress gradients on
the contour integral evaluation. Set this parameter equal to the step number
from which the stress data in the last available increment of the specified
step will be considered as residual stresses. The default is 0, in which case
the residual stresses are defined by the specified initial conditions.
This parameter can be set equal to zero only when the XFEM parameter is specified.
 SYMM

Include this parameter to indicate that the crack front is defined on a
symmetry plane, with only half the structure modeled. The change in potential
energy calculated from the virtual crack front advance is then doubled to
compute the correct contour integral values.
This parameter is not relevant when the XFEM parameter is specified.
 TYPE

Set TYPE=J (default) to specify Jintegral
calculations.
Set TYPE=C to specify ${C}_{t}$integral
calculations.
Set TYPE=K FACTORS to specify the calculations of the stress intensity factors.
Set TYPE=TSTRESS to specify the Tstress calculations.
 XFEM

Include this parameter to indicate the type of integration method to use.
This setting is applicable only to cracks modeled as an enriched feature
(XFEM).
Set XFEM=DOMAIN (default) to indicate that the fracture parameters are
evaluated by using the domain integral method.
Set XFEM=LINE to indicate that the fracture parameters are evaluated by
using the line integral method.