Kt for a joggle - bolted single lap shear

[drescheg07]

I have a small composite assy FEM that includes a joggled bolted single lap shear joint with a small amount of bending and compression. Macro panel geometry is organically curved. About 2 dozen fasteners. Since the joggle depth is 1 panel thickness, I was planning to exclude the joggle step from the mesh, include an element offset on the overlap face, RBE2/CBUSH elements to model the fastener connections between the two components, and calculate the fastener and bearing margins by hand along with a Kt for the joggle strains. However, I am having a hard time finding a reference for an appropriate Kt. Does anyone have a reference for a good Kt on this geometry? Is this a recommended path?

Thanks in advance for any guidance.

 

[SWComposites]

The joggle and the joint are separate analyses.
Don’t model the joggle, and don’t use offsets (they can have incorrect or unintuitive results).
For the joggle, you need to check:
- in-plane laminate strength with the moment due to the joggle. Use a hand calc given the applied far field loads.
- interlaminar tension in the joggle radii using applied moment and curved beam formula.