convergence issue with Drucker-Prager cap plasticity integration algorithm. How to sort this?

- February 11, 2021 at 10:01 am
  
  tolukumar
  Subscriber
- February 12, 2021 at 4:12 pm
  
  John Doyle
  Ansys Employee
  
  Your material model setup looks generally correct for a coupled damage-plasticity Microplane model. The format looks same as the example offered in Section 4.8.2.2 of MAPDL Material Reference Manual, with some of the strength values modified.nThe warning message that you are showing in solver output is very general. It could mean that the code cannot establish where the stress state is on the yield surface. Have you bisected to the smallest time step size? This might be remedied by using more substeps, but I cannot tell from the output if you have reached the minimum time step size or what your autotime stepping specifications are. nAlso, what is the motivation for using the CPT215 element? Are you trying to define a pore pressure thermal simulation? Perhaps you need to change the strategy of the loading to make it more manageable to resolve. n
- February 26, 2021 at 11:07 am
  
  tolukumar
  Subscriber
  
  . Actually I am using a minimum substep of 60 and a maximum of 100. But, the error still persists. I don't know how to solve it nBy the way, I am using CPT215, because I want to use drager prager plasticity criterion for seismic analysis of my concrete beam-column joint.n

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