module of young

[cliff23]

Bye to all,

with reference to the metal elasticity module I have a doubt:

example:

- aluminum 1050 sp 1.5mm module of young=110
- stainless steel 18/10 crni1810c1000 sp 0.8mm module of young=300

Does this indicate that the younger value is lower and the material is deformable? Is that gonna have menop elastic returns?
Does practice tell me so, but technically it's correct?

 

[cacciatorino]

No, things are unfair.
the young module indicates the rigidity of the material, as long as you stay in the elastic field. What happens then once you get out of the elastic field is not predictable by looking at the only young module.

For example, all steels, either sweet or reclaimed or bonded, etc. etc., have the same value as and, what differentiates them is then the tension they can endure before leaving the elastic field, and then how much they can stretch plastically before breaking, always after they came out of the elastic field.

think of two helical springs made of steel type fe360 and one of c40 tempered, equal dimensionally. both will deform the same quantity under the same load (sigma = e*epsilon), but that of fe360 will be able to absorb lower loads (and therefore lower deformations) without undergoing permanent deformation (i.e. before reaching the yield).

 

[michele81]

means that at equal load conditions plus the young module is lower the greater the elastic deformation suffered from the piece (but valid only in the elastic field for both materials compared)

 

[cliff23]

Okay.

But if we move to the molding field, it should be that the module is lower, the material will have less elastic returns...right?

 

[Ing.Vedder]

I'm sorry, it's not my field, and maybe I'm talking shit, but an elastic deformation you have to see with the molding? !
try to explain the problem better.

 

[sampom]

I'm sorry, it's not my field, and maybe I'm talking shit, but an elastic deformation you have to see with the molding? !
try to explain the problem better.

I think cliff refers to the molding of sheets.

greetings
Mar

 

[cacciatorino]

Okay.

But if we move to the molding field, it should be that the module is lower, the material will have less elastic returns...right?

I think you have to choose the material that has less yielding elongation, which then a material with low yielding also has low elastic module is likely but not automatic.
what this means: if you take a material that has the yield to 3% and attach it to 5%, you will have a deformation residue of 2% (i.e. after deformed, he first recovered 3%, and then stopped with the residual deformation of 2%).

if instead you take a material that yields to 1%, of 5% deformation that imposes them, 4% is maintained while instead 1% is recovered.

 

[africagia]

to make molding you must impose deformations in plastic field where you use the law of plastisco flow given by: sigma= c*epslon^n where c and n are constant of the material.
on the elastic field, instead, you use the law of hooke given by: sigma= and*epslon where and is the module of young.

 

[cliff23]

thanks to all for the delucidazioni in materia.
I actually refer to the molding of sheet metal.
in particular on the cad of the truth a module called visi blank that in practice develops automatically the details imbuted.
in addition to this releases reports with the particular shadate and with the incorrect idle a different coloring of the critical zones for thinning or thickening of the material.
all this according to the definition of the material that is set.
the database of the materials available also indicates the elasticity module expressed in mpa. for this I posted and assumed that on low module corresponds a greater plasticity and, on high module, a greater elastic return. For example by setting the docol 600 the module corresponds to 600 and in fact its elastic return under press is remarkable.

 

[africagia]

Got it. in the definition of the material the module of young wants us because, even if the deformation is plastic, when it is discharged, it is discharged according to a straight that has as angular coefficient just the module of young and from here you get to the only plastic deformation. this because when you charge beyond the yield you will have both a plastic and elastic deformation. However also the constant c I said in the previous post is measured in mpa.