The second simplified model does not include any threads. The only simplification, I have with regards to geometry is that the threads do not have a helix angle in order to make use of the axisymmetry model. I also rounded sharp thread corners with small 0.3 mm radii since, in reality, no sharp corners exist and to prevent any stress singularity. Please note here that if you model the basic (ideal) thread geometry, there will not be any gap between the threads and the resulting stress distribution will not reflect reality. The threads are based on 6g/6H tolerance which is applicable for general use in commercial applications such as wind turbines. ![]() Additionally, the bolt geometry is realistic and includes tapered shank before the threads as well as fillet at the bolt head to shank corner. In the first or detailed model, threaded frictional contact is created between the nut and bolt. ![]() Finite Element Models of Bolted Connections
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