formula for safety factor

[kikko]

In stress analysis the safety factor is exposed.
Can you help me find the formula used in the calculation?
the customer is not enough the presentation of the result but also the method used.
Thank you very much
kikko

 

[pompeo79]

in inventor the safety factor is calculated according to the yield load or the breaking load of the material.

the formula used is the same as always.

fs=carico disnervazione/carico design
fs=load break/load design

and as always if less than one | > design failure,
and fs normally desired are from 2 up depending on the fields.

 

[Maurs79]

Good morning
my name is maurizio I am a new user but purtoppo in mechanical design I have little experience.
I would like to know:
if I have to design a mechanical piece, for example a motor support, this support must withstand a certain weight.
the safety factor, from which the characteristics of the support derive, must be calculated by attempts or is there a way to dimensional the support depending on the load you have to support?
I hope I've been clear.
thanks and distinguished greetings maurizio

 

[TECNOMODEL]

There are, of course, methods to dimensional each mechanical organ.
even because otherwise before the advent of the fem you could not have planned anything.
If you have no knowledge in mechanical design I think it's hard for you to succeed in the task.
Do you have any school knowledge?

 

[Maurs79]

There are, of course, methods to dimensional each mechanical organ.
even because otherwise before the advent of the fem you could not have planned anything.
If you have no knowledge in mechanical design I think it's hard for you to succeed in the task.
Do you have any school knowledge?

technomodel thanks to answering me, the school knowledge I'm trying to do, a little I have and a little not.
But the speech is that if the safety factor has to be greater or equal than 1 if it is greater than one I how do I know how much it has to be greater than 1?
If there was no fem calculation if the safety factor has to be greater than 1 how do I know how much it has to be greater than 1?
thanks and distinguished greetings maurizio

 

[TECNOMODEL]

in inventor the safety factor is calculated according to the yield load or the breaking load of the material.

the formula used is the same as always.

fs=carico disnervazione/carico design
fs=load break/load design

and as always if less than one | > design failure,
and fs normally desired are from 2 up depending on the fields.

who hai già la risposta.

 

[Maurs79]

who hai già la risposta.

Good evening.
technomodel thanks to your help, you have been very helpful.
thanks and distinguished greetings maurizio

 

[Nico306]

you have to calculate your stress whether you work with traction, compression, bending, twisting or combinations of these which must be lower than the resistance of the material normally you take the resistance to yielding that for steel for example is 1600 kg/cm2 the ratio between this value and what you have to calculate is the safety factor. for ductile materials is between 1.3 and 2 and for fragile materials is between 2 and 4.