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Reduction of Bolt Allowable in Lap Joint with packer in shear load

Reduction of Bolt Allowable in Lap Joint with packer in shear load

Reduction of Bolt Allowable in Lap Joint with packer in shear load

(OP)
In a structural Steel or Aluminium Lap Joint subject to shear load, with a shim (packer) in the joint, what is the Reduction in the bolt allowable load when the packer is thick (more then 15% of bolt diameter). What is the method to calculate the bolt stress when the packer (shim) is more then about 15% the bolt diameter?.  

RE: Reduction of Bolt Allowable in Lap Joint with packer in shear load

structural Aluminium Lap Joint?

RE: Reduction of Bolt Allowable in Lap Joint with packer in shear load

I would suggest that you carry out 2 checks.
1) Calculate bending stresses in the bolt based on the bolt being bent into an s-shape (assume head and nut fixed in rotation and reaction forces at mid-thickness of plates) and then check for combined (bending) tension plus shear in the bolt using the normal formulae.
2) Check stresses if the entire bolt rotates (as seen from the edge of the plate) without bending.  This will cause additional bearing stresses on the edges of the holes and additional tension on the bolt.

RE: Reduction of Bolt Allowable in Lap Joint with packer in shear load

(OP)
The bolts/rivets can be either steel or aluminium, the plates are aluminium

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