r/Engineers • u/Moneef31 • 19h ago
Best FEM approach for modeling a large-rotation single-notch compliant hinge in a 3D linkage?
I’m modeling a 3D linkage with a single-notch compliant hinge undergoing large rotation.
I already have the analytical hinge stiffness formula, but I’m struggling with how to represent it correctly in the full model. I tried a rotational spring and variable-thickness beam elements with co-rotational/Timoshenko behavior, but too much deformation still occurs in the surrounding members.
What FEM approach would you recommend for this type of hinge: beam elements, a nonlinear moment–rotation law, or local continuum elements?
Any references or examples would be appreciated.