Blind Bolt Bending Analysis

[Neworder]

Hello,

Does anyone know why within structural aerospace analysis the preference appears to be to ignore blind bolts in bending?

John.

 

[SWComposites]

What do you mean by "ignore blind bolts in bending"? not perform a stress analysis of a bolt in a particular joint configuration? not use such bolts in a highly eccentric joint? ignore them in a load share analysis? or something else?

Please post the detailed reason for your question, and details of your particular joint configuration, strap materials, loadings, etc.

 

[Dan320]

As far as I know, blind bolts are fitted to interference holes. As long as the interference is intact, bending can be neglegted in most cases.

Dan

 

[SuperStress]

Bolt bending is not a function of hole fit, but of joint eccentricity as SWComposites infers.

Blind bolts are not preferred for large-eccentricity joints. They lack the clamp-up capability of a traditional threaded fastener, and will fail prematurely in that usage. That's why you can't find data or analysis for that failure mode; it's a bad design detail.

SuperStress

 

[Dan320]

Fastener bending occurs (or can occur) in non-interference shear joints.
That is a more elaborate answer to my interpretation of the OP question.

Dan