Hello, I was wondering if anyone can help me with my FEA approach. I want to check that my boundary conditions for a simple quarter torus (representing a section of a helical spring) are correct. I'm neglecting the helical angle at this stage. I have fixed one end in all axes, and applied displacements to the other end to represent how a quarter of a coil would deform when the whole spring is compressed. Please see my diagrams, which illustrates my problem clearly, along with my working out. The centre of the spring is at 0,0,0. Displacement is δ, and Phi is ∅. I think the boundary conditions are not correct, as I am experiencing much higher stresses than I should be. If anyone out there can help me, it would be of great benefit to me, as I simply do not understand why my assumptions are wrong! Thanks!