margin "security" on buckling multiplier

[Ing.Vedder]

Good morning to all,
I performed a buckling analysis of a component and the computing software returns me a critical multiplier equal to "3". I think we can say in line theorica the component is not subject to instability (in this specific case it is instability to flexotortion).

However, I was wondering what a reasonable "safety factor" is to be kept to be calm, I think (but I'm not sure) that critical multipliers are usually kept much higher (over 10 to understand).

Can anyone help me? This component (in detail is a stunning beam) is creating a nice skyscraper.

thank you very much to those who will help me

 

[meccanicamg]

for steels factor 3 to 5, for cast iron 7 to 8 and for construction wood from 9 to 11. all this applies to static loads. for dynamic loads multiply everything by a coefficient between 2 and 3.

 

[Ing.Vedder]

for steels factor 3 to 5, for cast iron 7 to 8 and for construction wood from 9 to 11. all this applies to static loads. for dynamic loads multiply everything by a coefficient between 2 and 3.

Wow thank you! what precise and concise answer.
Can I know where these values come from? from the experience of buckling analysis?
I ask this not for poor trust is clear, but only because I have sought a lot of answers on the subject but I have always found little or nothing.

Thanks again

 

[meccanicamg]

I have collected the various information over the years from manuals, dispenses and notes and have come to us.

 

[volaff]

Good morning, I'm going slightly off-topic.
talking about manuals and books as you judge (if you have any knowledge), this:

manual of machine organs
design methodologies, joints, screw connections, springs, bearings, lubrication and wear, trees, picks and seals

tastev niemann, hans winter, berndt-robert höhn.

Thanks

 

[abelli12]

Good morning, I'm going slightly off-topic.
talking about manuals and books as you judge (if you have any knowledge), this:

manual of machine organs
design methodologies, joints, screw connections, springs, bearings, lubrication and wear, trees, picks and seals

tastev niemann, hans winter, berndt-robert höhn.

Thanks

This is the translation of the German "maschinenelemente" vol. 1 of the niemann (bviera monk university), printed also in Italy in the 1980s. the one you mentioned is the last edition available.

I find it a great book, complete and precise, very useful in the design and sizing phase of the main mechanical organs (excluding gears and other elements), although many topics can also be found in our mechanical manuals.
the treatment and the symbolism are obviously of German imprint and the rules of reference are din, therefore it is necessary a little attention to those who are not accustomed.

 

[volaff]

This is the translation of the German "maschinenelemente" vol. 1 of the niemann (bviera monk university), printed also in Italy in the 1980s. the one you mentioned is the last edition available.

I find it a great book, complete and precise, very useful in the design and sizing phase of the main mechanical organs (excluding gears and other elements), although many topics can also be found in our mechanical manuals.
the treatment and the symbolism are obviously of German imprint and the rules of reference are din, therefore it is necessary a little attention to those who are not accustomed.

Thank you very much.
Then, possibly, extrapolation by chapters