CINT, Action, Par1, Par2, Par3, Par4, Par5, Par6, Par7
Defines parameters associated with fracture parameter
calculations
-
Action Specifies action for defining or manipulating initial crack data:
NEW
—
CTNC
—
CENC
—
Define the crack-extension node component, the crack-tip node, and the crack extension direction.
TYPE
—
DELE
—
NCON
—
Specify the number of contours to calculate in the contour-integral calculation.
SYMM
—
Indicate whether the crack is on a symmetrical line or plane.
NORM
—
UMM
—
EDIR
—
PLOT
—
CXFE
—
Define the crack-tip element or crack-front element set. Valid for XFEM-based crack-growth analysis only.
RADIUS
—
Define the radius at which the given value is to be evaluated. Valid for XFEM-based crack-growth analysis only.
RSWEEP
—
Define the minimum and maximum sweep angle from existing crack direction. Valid for XFEM-based crack-growth analysis only.
Command Specifications for Action = CTNC
CINT, CTNC, Par1, Par2, Par3
-
Par1-- Crack-tip node component name.
-
Par2-- Crack-extension direction calculation-assist node. Any node on the open side of the crack.
-
Par3-- Crack front’s end-node crack-extension direction override flag:
- 0 --
Align the extension direction with the edges attached at the two end nodes of the crack front (default).
- 1 --
Align the extension direction to be perpendicular to the crack front.
Command Specifications for Action = CENC
CINT, CENC, Par1, Par2, Par3, Par4, Par5, Par6, Par7
-
Par1-- Crack extension node component name (CM).
-
Par2-- Crack-tip node. The crack-tip node defaults to the first node of the crack extension node component.
-
Par3,Par4-- Coordinate system number (
Par3) and the number of the axis that is coincident with the crack direction (Par4). When these parameters are defined,Par5,Par6andPar7are ignored.-
Par5,Par6,Par7-- Global x, y, and z components of the crack extension direction vector. (
Par3andPar4must be blank.)
Command Specifications for Action = TYPE
CINT, TYPE, Par1
-
Par1-- Type of calculation to perform:
- JINT --
Calculate J-integral (default).
- MFOR --
Calculate material forces.
- SIFS --
Calculate stress-intensity factors.
- TSTRESS --
Calculate T-stress.
- VCCT --
Calculate energy-release rate using the VCCT method.
- CSTAR --
Calculate C*-integral.
- PSMAX --
Calculate circumferential stress at the location where
when sweeping around the crack tip at the given radius.
Valid in an XFEM-based crack-growth analysis only.- STTMAX --
Calculate maximum circumferential stress when sweeping around the crack tip at the given radius. Valid in an XFEM-based crack-growth analysis only.
Command Specifications for Action = UMM
CINT, UMM, Par1
-
Par1-- - OFF, 0, or NO --
Deactivate Unstructured Mesh Method (UMM).
- ON, 1, or YES --
Activate .
Command Specifications for Action = EDIR
CINT, EDIR, ITYPE, Par1, Par2, Par3, Par4
-
ITYPE-- Input type for the crack-assist extension direction. Valid values are CS (coordinate system number) or COMP (component x or y extension direction).
-
Par1-- If
ITYPE= CS, the coordinate system number.If
ITYPE= COMP, the x component of the crack-assist extension direction.-
Par2-- If
ITYPEis CS, the axis representing the crack-assist extension direction.If
ITYPE= COMP, the y component of the crack-assist extension direction.-
Par3-- For
ITYPE= CS, this value is not specified.For
ITYPE= COMP, the z component of the crack-assist extension direction.-
Par4-- A reference node on the crack front attached to the crack-assist extension direction. To accurately calculate and flip the crack extension directions, the crack-assist extension direction defined at this node is rotated as the tangent along the crack front rotates. This capability is useful when the crack-extension directions vary by more than 180 degrees along the crack front.
Command Specifications for Action = PLOT
CINT, PLOT, Par1, Par2
-
Par1-- Crack ID.
-
Par2-- 0 -- Disable plotting of crack-tip coordinate system.
1 -- Enable plotting of crack-tip coordinate system (default).
Color codes are white for crack-extension direction, green for crack normal, and red for the direction tangential to the crack front. To clear or delete the plots, issue the /ANNOT command.
Notes
Initiate a new calculation via the Action = NEW parameter. Subsequent CINT commands (with
parameters other than NEW) define the input required for the fracture
parameter calculations.
The simplest method is to define crack information using
Action = CTNC; however, this method limits you to only one node for a
given location along the crack front. Use the CTNC option only when all nodes that define the
crack front lie in a single plane.
To define crack information at multiple locations along the crack front, use
Action = CENC. You can issue
CINT,CENC, Par1, etc. multiple times to
define the crack-extension node component, the crack tip, and the crack-extension
directions at multiple locations along the crack front.
Although you can vary the sequence of your definitions, all specified crack-tip nodes must be at the crack front, and no crack-tip node can be omitted.
You can define the crack extension direction directly by specifying either
Action = CENC or Action =
NORM.
The crack-assist extension direction (Action = EDIR) provides a
generic extension direction when Action = CTNC is specified.
It is used to help define crack extension directions based on the connectivity of the
crack-front elements. For a 2-D case, when the crack tangent cannot be calculated, the
crack-assist extension direction provided is used directly.
For Action = UMM, the default value can be OFF or ON depending on the element type. The
CINT command overrides the default setting for the given
element.
For an XFEM-based crack-growth analysis:
Action= CTNC, CENC, NCON, SYMM, UMM, or EDIR have no effect.Action= CXFE, RADIUS, or RSWEEP are XFEM-specific and invalid for any other type of crack-growth analysis.For CINT,TYPE, only
Par1= PSMAX or STTMAX are valid. OtherPar1values have no effect.
The stress-intensity factors calculation (CINT,TYPE,SIFS) applies only to isotropic linear elasticity. Use only one material type for the crack-tip elements that are used for the calculations.
When calculating energy release rates (CINT,TYPE,VCCT), do not restrict the results from being written to the database (/CONFIG,NOELDB,1) after solution processing; otherwise, incorrect and potentially random results are possible.
The CINT command supports only strain data for initial state (INISTATE,SET,DTYP,EPEL). Other initial state capabilities are not supported.
For more information about using the CINT command, including supported element types and material behavior, see Evaluation of Fracture Mechanics Parameters in the Mechanical APDL Fracture Analysis Guide.