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Tmax for Puck failure model

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I am using Puck failure mode for solids elements but I don't know how to choose Tmax - Dynamic time relaxation.

I found in the help that 

Normal value of Tmax is 10 times higher than the actual times step should be set in the card directly

But the time step is not constant in Radioss.

Could you please help me show me how to do?


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the time step should not vary significantly during the run and could be a sign of some modeling error.  Use timestep control CST mass scaling or AdvancedMassScaling to impose a constant time step. Or use the smallest timestep from the moment when the failure is expected.

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