Plasticity - Damage

  • Last Post 21 January 2019
moyilmaz posted this 21 January 2019

Hello all,

I'm working on reinforced concrete joint behavior under cyclic effects. I have experienced convergence issues with solid65 - conc table combination and now I'd like to look for some alternatives now. 

Using Menetrey-Willam plasticity (WM + HSD6) model, I had no problem obtaining good-matching results including the softening branch, however under cyclic loads, unloading stiffness is equal to elastic state of material since there is no damage formulation in this model.

I wonder if it is possible to introduce a cumulative damage formulation to reduce stiffness in each loading step. A simple damage parameter (or separate parameters for compression and tension) which is a function of plastic strains and reduces the elements stiffness in each step of reversal loading procedure would help me I think. A possible compression damage formulation is seen in the figure below.

So, I would like to keep solution in implicit scheme and tell to the code that it should calculate a damage scalar based on strain state and modify constitutive equations. Should I use usermats or a built-in feature may help in this issue? I would be really happy if you would suggest a solution for this problem.

Best regards


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jj77 posted this 21 January 2019

Not sure, perhaps someone from ansys might know.

peteroznewman posted this 21 January 2019

Review the Technology Guide in the ANSYS Help system, it has an example of a reinforced concrete using the Microplane model.