CGROW, Action, Par1, Par2
Defines crack-growth information
ActionSpecifies the action for defining or manipulating crack-growth data:
— | Initiate a new set of crack-growth simulation data (default). | |
— | Specify the crack-calculation (CINT) ID for energy-release rates to be used in the fracture criterion calculation. | |
— | Specify the fracture criterion for crack-growth/delamination. | |
— | Specify the element component for crack growth. | |
— | Specify the initial time step for crack growth. | |
— | Specify the minimum time step for crack growth. | |
— | Specify the maximum time step for crack growth. | |
— | Fracture criterion ratio (fc). | |
— | Stops the analysis when the specified maximum crack extension is reached. | |
— | Define the method of crack propagation. | |
— | Specifies fatigue crack growth. |
Action = CIDPar1Par1 --Contour-integral calculation (CINT) ID for energy-release rates to be used in fracture criterion calculation.
Action = FCRATPar1Par1 --Fracture criterion ratio (fc, where fc is generally around 1). The recommended ratio is 0.95 to 1.05. The default is 1.00.
Action = FCGPar1,Par2Par1 --METH -- Fatigue crack-growth method.
DAMX -- Maximum crack-growth increment.
DAMN -- Minimum crack-growth increment.
SRAT -- Stress/load ratio.
DKMIN -- Threshold value of equivalent stress-intensity factor (SIF).
DN -- Incremental number of cycles.
Par2 --Method -- LC (life-cycle method) or CBC (cycle-by-cycle method). Valid
only when Par1 = METH.
VALUE -- Value for the specified
Par1. Valid only when Par1 = DAMX,
DAMN, SRAT, DKMIN, or DN.
When Action = NEW, the CGROW command initializes a crack-growth simulation set. Subsequent CGROW commands define the parameters necessary for the
simulation.
For multiple cracks, issue multiple CGROW,NEW commands (and any subsequent CGROW commands necessary to define the parameters) for each crack.
If the analysis is restarted (ANTYPE,,RESTART), the CGROW command must be re-issued.
For VCCT crack growth:
Crack-growth element components must use the crack tip nodes as the starting nodes of the crack path.
Fracture criteria (Action = FCOPTION) use energy-release rates calculated via VCCT technology
(CINT,TYPE,VCCT). For information about the fracture
criteria available, see Fracture Criteria in
the Fracture Analysis Guide or the documentation for the TB,CGCR command.
For XFEM-based crack growth:
If the SAVE command is issued after any CGROW commands are issued, the CGROW commands are not saved to the database. Reissue the CGROW command(s) when the database is resumed.