Hi everyone!

In the model I attach I want to simulate pure bending. I apply rotations in the reference points (RP Aft and Fore) and I constraint these RPs using MPC-Beam with the end edges of the model. I also apply MPC-beam constraint on the cross-sections (XY plane) by connecting the reference points (Frame A and B) with the corresponding cross sections. 

My problem is that the first attempt of the first increment is unsuccessful. I have tried different amplitudes of rotation (dynamic implicit, quasi-static solver) but nothing changes. Any idea?