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I'm running a simulation of a Shigley problem where the connections are bolted and the force values aren't the same, and the simulation is giving me an error; it's not converging. What could be wrong? Can you help me, please?
Hi Mecanico,
The error indicates that the solver has reached the maximum number of nonlinear contact iterations, which usually means the contact conditions in your bolted assembly are not stabilizing during the solution. In bolted connections, this often happens when there are initially open gaps between plates, insufficient contact resolution, incorrect contact definitions (e.g., friction too high or unrealistic stiffness), or when bolt pretension and external loads are applied too abruptly. Unequal force distribution can also result from improper boundary conditions, over-constraining the model, or not defining the bolt hole interactions correctly. To improve convergence, increase the contact connection resolution level, ensure parts that should be touching are defined with “initially closed” contact if appropriate, verify bolt pretension setup, and double-check that supports are realistic and not causing artificial stiffness. These adjustments typically help stabilize nonlinear contact behavior and allow the solution to converge.
Regards,
Sourav
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