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Ansys Learning Forum › Forums › Discuss Simulation › General Mechanical › nonlinear convergence › Reply To: nonlinear convergence

April 29, 2020 at 6:49 pm
Wenlong
Ansys Employee

Hi,


Sorry for my late reply. Can you try displacement control instead of remote displacement? That may make it easier to converge. Even if you don't include any nonlinear stabilization damping, a tiny bit of artificial damping in the separation-distance based debonding may be necessary to converge. For example, the first image I showed uses artificial damping=0 and unable to converge, while the second one only uses artificial damping coefficient in CZM as 0.0001 and it helps tremendously in convergence. 




By the way, I commented wrongly on Young's modulus in the previous reply. It doesn't directly influence the initial slope of the bilinear cohesive law, but indirectly influence initial stiffness by influencing the normal contact stiffness. Please refer to this website for more details: https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v194/ans_thry/thy_mat11.html



Regards,


Wenlong


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