fastener tension results from multiple layers

[051174]

Supposing to have 3 fem/quad layers and a 2 allined cbar simulating fasteners crossing them.I'm in doubt about tension element results if summing (supposing 3 layers)the 2 bar element forces is as to say having resultant tension acting force on bolt....it seems to me that single element can give by themself a relative reading on the stiffness of the 2 remaining layers from each side so that both from their side can give a real tension acting load....so that the maximum tension results from these 2 forces can be considered to verify the bolt.
Is it true? Can give this question some doubt? How to approach correctly this question?

 

[vonlueke]

051174: In general, your statement is true. The maximum positive tensile force from the two cbar elements could be considered to be the applied bolt tensile force. But don't forget to also convert the maximum cbar prying moment to additional tension on the bolt (by dividing the cbar moment by the heel contact distance), then add that additional tension to the maximum cbar positive tensile force (unless you are also modeling surface contact between your three quadrilateral shell element layers). Also include preload in your hand calculations when verifying the bolt. Good luck.

 

[051174]

Thank you for your so helpful and deep answer.
...and for shear resultant on bolt?always in multiple layer configuration. thank you in advance.

 

[vonlueke]

051174: List the shear resultant at each end of each beam element. See which one of these shear force resultants is the maximum. The bolt should be able to withstand the maximum shear resultant.