7.2.6 Main Takeaways on Failure of Mechanically Fastened Joints
Course subject(s)
Module 7. Joining of Structures and Manufacturing
Failure modes
Failure in mechanically fastened joints is a complex competition between different possible failure modes. We examined the major failure modes illustrated below and looked at which design variables are dominant in each failure mode.
![](https://ocw.tudelft.nl/wp-content/uploads/failuremodes.png)
Accompanying Failure Load Formulas
Net Section Failure: Β πΉπ ππ=π‘(πβπβ π)β ππ‘π’, with n the number of fasteners along net section, d the diameter of the fastener, and t the plate thickness of the section.
Bearing Failure: πΉππ=πβ π‘β πππ, with d the diameter of the bolt and t the thickness of the sheet
Shear Out Failure: Β πΉπππ=2β πβ π‘β ππ π’, with bΒ the distance to the edge and t the thickness of the sheet.
FastenerΒ Shear Failure:Β
![](https://ocw.tudelft.nl/wp-content/uploads/Screen-Shot-2019-06-21-at-11.46.15.png)
,with d the diameter of the bolt and n the number of shear plainsΒ (n = 1 for 2 plates, n = 2 for 3 plates etc.)
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