David Weed
Ansys Employee

 

Hello,

Thank you for your question submission. The solver output indicates the following:

*** WARNING ***                         CP =      43.047   TIME= 14:36:36
 SMART remeshing algorithm does not produce new crack surface with a    
 good quality mesh for Cgrow ID 1.  Crack propagation is stopped.       

You may may consider refining the mesh in the crack area and/or creating a better mesh transition from the crack area to the broader mesh. For instance, you can use local mesh size controls to make the transition more smooth. The key is that you don’t want the transition from the crack mesh area to the global mesh to be too drastic in terms of element size.

Another consideration is that you are using R19.1, which is an earlier iteration of the SMART crack growth feature. Future versions are more robust, in terms of the crack remeshing algorithm, and you may want to consider upgrading. Also, for R19.1, distributed solve is not supported (you can see a message in the solver output indicating that it is being turned off). In future versions, distributed solve is supported which can significantly reduce the simulation run time.

One important thing to keep in mind for fatigue crack growth is that every substep that is specified is seen as a crack growth event; i.e., delta_a, the crack extension increment, will be calculated for each sub step based on your Paris’ Law parameters. Instead of choosing Automatic time stepping, one should turn that off and specify a discrete number of sub steps.

Let me know whether these suggestions help and if anything can be clarified.