Dear Oleg and Marks
Thank you for your quick reply. Sorry for late, I was away for two days.
@Oleg:
Yes I mean ultimate material strength. The sent paper is quite helping. In
FIG. 2., stress-strain curve is drawn. We know applied strain but how can
we measure stress (F/A). Ok A is known but What is
Maybe it is appropriate to clarify this.
As a rule plasticity occurs via dislocation motion and/or nucleation. While
these can be modelled it is a complex calculation to obtain the needed
terms. If you are interested in this read up on terms such as Peierls
stresses, e.g. https://en.wikipedia.org/
Do you mean the ultimate material strength when you refer to "breaking point”?
Straightforward calculations (like this one
http://arxiv.org/pdf/1303.7259v1.pdf) are possible, but the obtained result
will be orders (!) of magnitude higher than any practical values. The reason is
that it is hard
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