Le 4 janv. 2010 à 13:36, Václav Šmilauer a écrit :
>>> - with log, there is no upper limit to strain (except the grain
>>> size/period size condition), you can compress 100, 200, 300%. With your
>>> definition, e=100% has no meaning.
>> e=-100% ;-)
> (This BTW is not really "valid" argument... the same as that it would be
> better to use log(abs temperature) instead of temperature so that you
> can't get below 0K, or something similar for velocity so that you can't
> get above light speed. I still agree with you on that it makes more
> sense for compression to use log, though, and that the point is valid in
> general.)
Hi Vaclav and Bruno,
I've got just one short comment (it could help... or not...):
To avoid log, you could basically compute the natural strain as the sum of the
increment strain at each time step.
eps = sum deps
so that (in 1D)
eps = sum dl/l /simeq dl/l0 for small strain
/simeq log(1+dl/l0) for large strain
Vincent
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