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For crack propagation command line like below,
which stress quantity is used to judge the criterion ? i.e. compared to 0.6 ? Nodal stress at integration pt. / averaged node stress / element stress at centroid / element face stress ? For result as below, S22 at integration pt 2 (closest to node 76) of el 75 overides 0.6 already, but no propagation happens yet.
*FRACTURE CRITERION, DISTANCE=0, TYPE=CRITICAL STRESS, TOLERANCE=0.05
0.6, 1.e12, 1.e12
E L E M E N T O U T P U T
ELEMENT PT FOOT- S11 S22 S33 S12
NOTE
75 1 -1.145 0.8023 -0.6857 -0.2000
75 2 -1.318 1.336 -1.046 0.9553
75 3 -0.7313 0.1478 -0.4447 0.1921
75 4 -0.5886 0.1412 -0.5809 0.6987
CRACK TIP LOCATION AND ASSOCIATED QUANTITIES
CRACK SLAVE MASTER INITIAL CURRENT CUMULATIVE NORMAL SHEAR
NUMBER SURFACE SURFACE CRACKTIP CRACKTIP INCREMENTAL FAILURE FAILURE
NODE NODE CRACK LENGTH STRESS STRESS
1 -37- -38- 76 76 0.0000 0.60000 1.00000E+12
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Also the standard manual mentions "Crack propagation information will be printed to the data file during the analysis if ......and the current value of the user-specified fracture criterion used"
BUT WHERE is the current value of fracture criterion used ? |
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