plasticity theory

[Ing Italy]

Good morning to all,

being the molding forum that is a plastic deformation processing I think can be the right section. My question is: Is the fact that a plastic deformation in every point of the material in deformation I can write the tensor of the efforts and the tensor of the incremental deformations (i.e. infinitesime) from which through other criteria I can obtain the value of an equivalent voltage and of an equivalent infinitesima deformation that characterize point by point the material. thanks to anyone who will have time and availability to clarify these concepts

 

[Fulvio Romano]

I don't understand much. . .

p.s.
perhaps it is better to move it to the forum "students mechanical engineering"

 

[SHIREN]

Good morning to all,

being the molding forum that is a plastic deformation processing I think can be the right section.

hi ing... .
This is the industrial molding forum.
but here we are interested in "dirty work"

as the lightning friend rightly says
we transfer to another forum this discussion
that in my humble opinion
seems interesting
Thank you very much
p.s.
try to move it to engineering students mecc
then if we find other specific forums we will adapt

 

[Ing Italy]

hello to both, first of all thank you for answering me!I wasn't sure where to post it, in the end I decided to put it here thinking that in a plastic processing like molding you use cam software and fem analysis in which incremental deformation equivalent and finite deformation equivalent from what I know are parameters used.I will try to move it immediately.

ps:ah well you have already thought about it,better because I would not have known how to do it! :

 

[meccanicamg]

Now,from the equivalent incremental deformation for integration I get the finite equivalent deformation,is the latter still characteristic of the single point of the material or concerns all the deformation material?

In my opinion if you have a tensor of infinitesimal efforts (which can be resulting 1d, 2d or 3d) and do the integral of the generalized formula of the applied infinity on the body you get the behavior of the deformation of the body. an infinitesimal applies to the point that is adimensional or better in our case at a 3d point.

is it right to say that the equivalent incremental deformation is the equivalent deformation of a point that deforms infinitesimal quantities and the equivalent finite deformation is the deformation of a point when this is subject to finite deformations? thanks to anyone who will have time and availability to clarify these concepts

if "equivalent incremental deformation" is the same as "equivalent infinitesimal deformation" will be the definition of how much a point is deformed (or better an infinitesimal of the body) applying external forces that deform it.

It goes by itself that the finite equivalent deformation is the deformation of a portion or of the entire body when I apply the external forces that deform it.

if you look at the state of effort on any science book of buildings you will find that there is an infinitesimal elementary volume (cubetto), a Cartesian reference system 3d and sigma and tau efforts arranged on the faces. through the matrix system is calculated the characteristic equation of the solution of tensions. simplifying in case 2d you can apply mohr circles always to determine the stresses.

the definition of posting instead you can get it from the principle of virtual works or from the elastic line, where you find yourself to have integrations of the trend of the moment slender throughout the body to know the trend of the law of displacement or rotation-

shift, effort and deformation are linked together.

If you want more information, I suggest you recover some books on finite element analysis or search for dispenses. something is always found to clarify ideas.

That's what I know. then or some female gives us the solution or... find you on some text and tell us whether it is actually like this or not:finger: