Eccentrically loaded bolted connections 1

[Nigel]

I am looking for some reference material for doing a plastic analysis on eccentrically loaded bolted connection.

This is an aircraft application but it doesn't really matter.

What I have is a joint where 2 of the nine bolts are failing in bearing. The remaining bolts are relatively lightly loaded. I want to show that as the highest loaded holes plastically deform in bearing the other bolts take up the load so in the end all the bolts are sharing equal load.

I am not able to use larger bolts or move them because of other constaints.

Any advice will be welcome from fellow pro's.
Nigel Waterhouse
n_a_waterhouse@hotmail.com

A licensed aircraft mechanic and graduate engineer. Attended university in England and graduated in 1996. Currenty,living in British Columbia,Canada, working as a design engineer responsible for aircraft mods and STC's.

 

[ishvaaag]

If the dynamical aspects can be assumed to be well covered in the represented loads, then typical design of connections should be able to be used. There are lots of typified connections and yours and the solicitations be covered in one of then.

As well, "equal" may not be the correct word but of course redistribution on plastification happens, assuming plastic behaviour remains standing for the materials, and one successive failure mechanism doesn't develo (which won't as long the stiffness of the lightly loaded bolts is met before the yielded bolts rupture).

This of course must be an extraordinary -factored level limit- situation, not one forecasted to be seen at the service level of the solicitation, for one never relies in plastic capacity (with the correlative deformations) at service level. At this service level all bolts must stay unyielded by one Von Mises check, and preferably the same should be true for the metal in the bearing hole.