December 25, 2021 at 7:41 pm
Rameez_ul_Haq
Subscriber
,I understand. And even when these won't work, then we should be going for modifying the penetration tolerance then. Makes sense, sir.
Secondly, I would like to pitch in one more thing here. Imagine I have a contact (like the one I showed above) and just keep interface treatment as 'Add offset, No Ramping'. Now, there is an initial gap between the faces where the non-linear contact was built. When they come into contact during the analysis, then the structure doesn't have any rigid body motion but if they don't, then the structure will. For a frictionless contact, even when I set it to 'Adjust to Touch', sometimes I experience a Rigid Body motion error and the analysis doesn't even begin, but for the same faces but the contact now changed to frictional or rough, the Rigid Body motion error doesn't mostly occur and the analysis atleast begin. I don't know why, though. It appears like because the solver somehow figures out that when (during the analysis) the faces come into contact, then due to friction, the Rigid Body motion could be avoided. This is my understanding. If this is true, then how would the solver proceed? I mean since it has already started, how will it know that the frictional force would be enough between the faces of separate bodies which will avoid any rigid body motion. Would love to hear your views on this.
I am asking this because I feel like (since the solver doesn't give me a rigid body motion intially and just begins for this frictional contact), then it might not converge even for the smallest of loads initially because of rigid body motion happening within my structure. That is why the NR Residual forces are very high; maybe it has some relation to rigid body motion. What would you say?
Secondly, I would like to pitch in one more thing here. Imagine I have a contact (like the one I showed above) and just keep interface treatment as 'Add offset, No Ramping'. Now, there is an initial gap between the faces where the non-linear contact was built. When they come into contact during the analysis, then the structure doesn't have any rigid body motion but if they don't, then the structure will. For a frictionless contact, even when I set it to 'Adjust to Touch', sometimes I experience a Rigid Body motion error and the analysis doesn't even begin, but for the same faces but the contact now changed to frictional or rough, the Rigid Body motion error doesn't mostly occur and the analysis atleast begin. I don't know why, though. It appears like because the solver somehow figures out that when (during the analysis) the faces come into contact, then due to friction, the Rigid Body motion could be avoided. This is my understanding. If this is true, then how would the solver proceed? I mean since it has already started, how will it know that the frictional force would be enough between the faces of separate bodies which will avoid any rigid body motion. Would love to hear your views on this.
I am asking this because I feel like (since the solver doesn't give me a rigid body motion intially and just begins for this frictional contact), then it might not converge even for the smallest of loads initially because of rigid body motion happening within my structure. That is why the NR Residual forces are very high; maybe it has some relation to rigid body motion. What would you say?
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