help fem

[pika]

@ radio: thank you so much! tomorrow I try to get it.

@ boscar: how is that pin made? is it not possible to add fitting rays? I believe that in section 2 you do not create interference problems while in section 3 you should at least increase the diameter. Is there a welding at section 1?

 

[boscar]

Hi, it's a turned hexagonal block.

 

[pika]

Hi, it's a turned hexagonal block.

if it is turned back then you can also make the fittings. surely will help the behavior of the particular when it is subject to fatigue and will decrease the affect effect.

 

[AlbertoC]

Okay, get the lesson! !

Now I put you in the annex (I messed up writing it nicely) the calculations I made for the static case.

I have not considered the tension state present in the pin due to the precarious tightening because first I did not notice, second I do not know well how I can calculate it.

Tell me what you think

The static scheme is wrong.
Look at this:http://corsiadistanza.polito.it/corsi/pdf/05asbdk/esercizio31_albero_soluzione.pdfsigma eq=(sigma^2+4tau^2)^(1/2)
ciao

 

[Fulvio Romano]

von mises for steels is more precise, but tresca is conservative (from safety). .

 

[AlbertoC]

von mises for steels is more precise, but tresca is conservative (from safety). .

by the good old youth:
the hypothesis of distortion energy (or von mises) is the most reliable for steels with similar traction and compression behaviour.
the hypothesis of the maximum tangential voltage (or tresca) is the most precautionary and it is worth having or not equal traction or compression behaviour.

I like to go on the safe:biggrin:
Hi.

 

[Fulvio Romano]

by the good old youth:
the hypothesis of distortion energy (or von mises) is the most reliable for steels with similar traction and compression behaviour.
the hypothesis of the maximum tangential voltage (or tresca) is the most precautionary and it is worth having or not equal traction or compression behaviour.

I like to go on the safe:biggrin:
Hi.

or to say it with the "scientists", the yield limit for trespass is a hexagon on the plane of the main tensions, von mises is the ellipse to it circumscribed. . .

I wonder what these finesses look like when the turn architect tells you "put security factor 3, so we're quieter." At that point, it's dimensional to the eye, right?
I don't know if it only happens to me...

 

[boscar]

thanks to all for the precious help!