pin calculation: only cut or even bending?

[s.gigi]

Good morning
My name is gluigi
I have a doubt about the size of pins
more in detail: when a pin can be sized only to cut (tough pin) and when instead it is necessary to consider also the bending? do there exist dimensional parameters that allow to define whether a pin is precisely tozzo or not?
Thank you.

 

[MBT]

Good morning
My name is gluigi
I have a doubt about the size of pins
more in detail: when a pin can be sized only to cut (tough pin) and when instead it is necessary to consider also the bending? do there exist dimensional parameters that allow to define whether a pin is precisely tozzo or not?
Thank you.

Good morning to you

vadetecum of the designer, ing. baldassini, published hoepli, 19th edition, page f-15

in my humble opinion, more than depending on the size of the pin, you must consider its assembly.
if the pin is not blocked, if the intersection between the supports is high, if there are all those conditions that allow the bending, then you must check both bending and cutting

I only check the thorns or calculate the cutting effort of a piece. for the rest, I generally consider bending and combined cutting

 

[davide75]

Well if a pin is loaded to cut it is also to bending by force.cmq in my engineering times they made us make verification of the pins soderando both the cut and the bending.cmq I think that goes very to experience and common sense, maybe considering good safety wiring and maybe checking also in what percentage the bending affects the cut.

 

[s.gigi]

thanks to all

 

[MBT]

little digression.
the only elements that come to mind as calculable only to cut are the tabs.
in fact they are made so that they are "cut".
tightened mating on the tree
mating with game on the hub, but stuff from cents of mm.
no light, or even the order of cents, between tree and hub.
In fact, with these assumptions, the bending is negligible.

 

[Fulvio Romano]

quoto mbt and specific:
does not depend on the size of the pin, but on the forces. If I have a pin along a metre, with two opposing forces half a millimeter away, the break will be cut. if they allude the forces, the cut always remains the same, while the flender moment increases until the tensions from moment on exceed the cutting ones until they are practically negligible. in the most common load cases this is what happens.

attention: It is not that if there is the moment there is no cut and vice versa. the two efforts always coexist, and should be added, in the case of steel, to de Saintvenant

Therefore, if "eye" the pin bends before breaking, you can overlook the cut, but if there are doubts, you should calculate the cutting tau (jourawski), the bending sigma and sum them to de saint venant.

last known for s.gigigi: the terms "tozzo" and "sle" are used in the case of tip load to divide the case of lateral instability and crushing. if you do not intend to consider effects of buckling, it should avoid these terms that can generate confusion

 

[bisogna_rimanere_umili]

and the admissible pressure verification should always be done or "val" only for the creeping bearings?