Esteemed Users,
I run a tooth root stress analysis of a crown gear pair. Driver is the steel pinion, driven is the POM gear.
The contact does not converge unless I added a small spring to the pinion to generate a counter torque to the load torque. The influence of the spring is neglectable, since the displacement is very small. The result is creditable.
The default amplitude was used.
Sandor
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Check this thread: Zero reaction moment when reading from ROT NODE in 2D - CalculiX (official versions are on www.calculix.de, the official GitHub repository is at https://github.com/Dhondtguido/CalculiX).
Such an approach with soft springs or dashpots isn’t uncommon and may often be utilized in analyses of mechanisms. You could also try running a dynamic analysis: Bevel gear dynamic simulation
Or use prescribed rotation BC instead of torque. Or use an additional step with such a BC to establish contact and then follow it with a step applying the actual loading. There are several approaches here.
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