fatigue crack growth in APDL (XFEM method) PROBLEM?

  • Last Post 19 September 2018
sohrab posted this 19 September 2018

Hi everyone,


I am trying to model and simulate fatigue crack propagation using XFEM method in APDL.


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sohrab posted this 19 September 2018

Following is the meshed model prepared for XFEM analysis













1.      1, İs it required to define local coordinate system at crack tip in XFEM method?




2.      2, Even in SING method I cannot define my crack tip inside an element, why?




3.       In order to constant amplitude loading I follow the following ,




time, 1.0




deltim, 0.02, 0.02,0.02








CGROW, FCG, METH, LC  ! life-cycle method




CGROW, FCG, SRAT, 0 ! stress-ratio




!loading frequency is 25 Hz












3,Does the abovementioned strategy true?




4.       4,How I can monitor cycle by cycle crack propagation and related crack parameters (a, deltaK and N)?




5.     5,  Crack front node number mentioned here does not listed in APDL node list call; is this a virtual node produced fro XFEM?





6.       6,By changing the loading magnitude and frequency I always get the following graphic. There is no change in the amount of crack growth (graphically).







 your helps and comments to help me fınd out my answers are fully appreciated in advance


SandeepMedikonda posted this 19 September 2018

Duplicate post answered here.