as per the other forum post Fatigue Study Error
check the solidworks kb (customerportal.solidworks.com) to see if that enhancement request has been implemented. i'm not aware that it has. so you would need to switch to solid or shells (check on shells, not sure if they are valid for fatigue either).
normally I would recommend also checking the help but it doesn't say specifically what element types are supported
thank you for your input, unfortunately when I switched everything to solids the model failed to mesh at all, neither a coarse mesh or control meshes were possible. It seems I have hit a dead end. I have to perform this analysis for three different frames and do not have time to really alter the design.
not much you can do when there is a software limitation. you'll need to do the geometry repair and idealization the old fashioned way.
try reducing the size of elements. After creating mesh, hide mesh display for better performance
I would mesh the model using beam elements and either:
1. Use the stresses in the members to carry out the fatigue calculations by hand using the appropriate fatigue category from a relevant standard.
2. If your interested in the joint fatigue, for example, a weld then extract the forces and moments at the joints and calculate the stress in the weld and carryout the fatigue calculations by hand using the appropriate fatigue category from a relevant standard.
This is not as difficult as it seems.