Mechanical APDL Structural Analysis Guide

CINT,NEW,1

CINT,CENC,CRACK_FRONT_NODE_CM1, , , ,Vx1,Vy1,Vz1

CINT,CENC,CRACK_FRONT_NODE_CM2, , , ,Vx2,Vy2,Vz2

CINT,CENC,CRACK_FRONT_NODE_CM2, , , ,Vxn,Vyn,Vzn

11.3.1.2.3. Step 3: Specify the Number of Contours to Calculate

Specify the number of contours for the J-Integral evaluation, as follows:

CINT,NCON,n

where n is the number of contours.

For 3-D crack geometry, every node along the crack front has the same number of contours.

Example

CINT,NEW,1

CINT,CTNC,CRACK_FRONT_NODE_SET,NODE

CINT,NCON,6

11.3.1.2.4. Step 4: Define a Crack Symmetry Condition

If the crack is located along a symmetry plane, and only a half model is created, define a symmetric
condition so that ANSYS can account for it:

CINT,SYMM,ON

Example

CINT,NEW,1

CINT,SYMM,ON! crack 1 is a symmetrical crack

11.3.1.2.5. Step 5: Specify Output Controls

Mechanical APDL calculates the J-Integral at the solution level and stores it to the results file for post-
processing. J-Integral output uses all the defaults from the OUTRES command. The command
OUTRES,ALL includes CINT command results. However, you can issue an OUTRES,CINT command to
control the specific output for J-Integral results only.

Example

CINT,NEW,1

CINT,CTNC,CRACK_TIP_NODE_CM

CINT,SYMM,ON

CINT,NCON,5

OUTRES,CINT,10

! output J-Integral every 10 substeps

11.3.2. VCCT Energy-Release Rat e Calculation

The approach for evaluating the energy-release rat e is based on the virtual crack-closure technique
(VCCT ). The energy-release rat e calculation occurs during the solution phase of the analysis and the
results are saved for postprocessing.

The following energy-release rat e calculation topics are available:
11.3.2.1. Using VCCT for Energy-Release Rate Calculation
11.3.2.2. Process for Calculating the Energy-Release Rate

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Fracture Mechanics