|From:||"Chowdhury, Sanjib Chandra" <sanjib@...2437...>|
|Date:||Thu, 3 May 2018 01:23:44 +0000|
Experimental E that is reported in the references is usually determined from the quasi-static loading (strain rate < 0.1/s) which is quite impossible to achieve in MD simulations. That’s why MD predicted E values are usually higher than experimental E values. One approach is to extrapolate the high strain rate MD modulus data to predict the low strain rate value. Check the paper that I mentioned in the previous email.
From: J Moon <answodbs43@...24...>
Thanks for pointing that out. As a person outside the field, I am quite new to calculating/measuring mechanical properties.
If the Young's modulus depends on the strain rate, how do we define a single value for E? For example, when searching for a table of E, books/references only provide one single value. Perhaps, these values are only for linearly elastic materials.
On the other hand, I thought c-Si was a linearly elastic material. When i changed the strain rate by 4 order of magnitude higher, I got E = 125 GPa vs 90 GPa that I used to get for lower strain rate.
Would you happen to have some insights into this?
I'd appreciate any comments.
On Wed, May 2, 2018 at 2:51 PM, Chowdhury, Sanjib Chandra <sanjib@...2437...> wrote: