iMechanica - suo group research - Comments

Thanks

rks2010 — Mon, 14 May 2012 07:30:50 -0400

Haeriest thanks for shearing such an unforgettable papers. Paper have a alot of information which is very much fruitful to me.

One's again thanks Dr. Foo for shearing this.

Thanking You

RajKumar sahu

Phd Scholar
IIT Patna

Dear Stephan, Thanks

tongqing.lu — Sat, 05 May 2012 11:24:29 -0400

Dear Stephan,

Thanks for your interests. I'm very glad to discuss!

Best

tongqing

It is a very interesting work

Stephan Rudykh — Fri, 04 May 2012 23:02:59 -0400

Dear Tongqing,

It is a very interesting paper. It would be great to discuss. Unfortunatelly, I did not find your e-mail -- could you please contact me by e-mail

rudykh-at-mit.edu

Look forward to hearing from you.

Best,

Stephan

cool~

fruit — Fri, 04 May 2012 21:49:54 -0400

^_^

Cons

jason Zhu — Wed, 08 Feb 2012 20:25:20 -0500

Hi, Keith,

Congratulations, Keith. It's a wonderful paper.

Jason Zhu

Best Regards

Re. Question

Kejie Zhao — Tue, 29 Nov 2011 12:54:51 -0500

Hi Dibakar,

Thanks for the questions. We considered the amorphous lithiated silicon shell and crystalline silicon core is seperated by a sharp phase boundary, without more experimental evidence, we didn't describe details of such boundary, for example, how lithium assiste the reconstruction of the structure, if a small amount of lithium is dissolved in the crystalline silicon lattice ahead of reaction front, etc. There are still quite a bit open questions to make the picture clearer. Please let me know if I answered your concerns.

-Kejie

Question

Dibakar Datta — Tue, 29 Nov 2011 00:01:30 -0500

Kejie,

You have mentioned in the introduction section that the phase boundary between the crystalline silicon and the lithiated silicon has a thickness of ~1 nm as observed in experiment . However, in your model, you have not considered phase boundary. You have considered only LixSi zone . Any explanation ?

I am trying to do some work related to your work. Thanks .

Regards,
Dibakar Datta
Email : dibakar_datta@brown.edu
PhD Student ; Major : Solid Mechanics
Shenoy Research Group
Brown University
Providence 02912 , USA

Thank you

Kejie Zhao — Sun, 27 Nov 2011 19:27:00 -0500

Thank you Dibakar, hope you can find it interesting. -Kejie

Great Work

Dibakar Datta — Sun, 27 Nov 2011 17:42:16 -0500

Congrats Kejie .. Great Work ...

Regards,
Dibakar Datta
Email : dibakar_datta@brown.edu
PhD Student ; Major : Solid Mechanics
Shenoy Research Group
Brown University
Providence 02912 , USA

Thanks

Rui He — Sun, 02 Oct 2011 21:18:50 -0400

Hi, Yuhang, thanks very much for your reply, and I have read the paper and book you mentioned, they're very helpful, thanks!

Hi Rui, 1. The

Yuhang Hu — Tue, 27 Sep 2011 08:27:09 -0400

Hi Rui,

1. The poroelasticity theory which was orignially developed By Terzaghi and later genaralized by Biot has been studied for many years. There are many versions to define the poroelastic constants. But in general, there are five independent constants including the kinetic constant (diffusivity or permeability). In gel theory it is usually assumed that the individual polymer chains and solvent molecules are incompressible, so we are left with three paramters. For soil material, Darcy's law is addapted as kinetic model. The effective diffusivity is D=2(1-v)Gk/(1-2v)η, where k is the so-called permeability and η is the viscosity of the fluid. Details about how the expression is derived, you can refer to the following paper:

Jinhwan Yoon, Shengqiang Cai, Zhigang Suo, and Ryan C. Hayward. Poroelastic swelling kinetics of thin hydrogel layers: Comparison of theory and experiment. Soft Matter 6, 6004-6012 (2010). http://www.seas.harvard.edu/suo/papers/232.pdf

2. The inelastic deformation so fas has not been considered in the indentation method. About theory, it has long been studied for soil material. You may refer to the following book:

O. Coussy, Poromechanics, (2004)

one more question

Rui He — Sun, 25 Sep 2011 09:34:58 -0400

Hi, Yuhang, thanks very much for your reply. When comes to soil material, I still have some questions

1. There're only three constants in poroelastic gels, however, there're four poroelastic constants (Lame constant and two more Biot's constants) in soil material, and would you explain what "effective diffusivity" correspond to in soil?

2. In your experiment, the indentation can be treated as purely elastic, however, as you can imagine, lots of soil materials are very soft and inelastic (such as plastic) properties can easily comes out. Do you have any idea of how to treat this problem?

Hi Rui, theoretically it

Yuhang Hu — Fri, 23 Sep 2011 23:37:08 -0400

Hi Rui, theoretically it works for saturated soil material. Just several points need to be considered.

In our model, the individual solvent molecules and solid skeleton are assumed to be incompressible. The volume change of the material is due to the change of solvent concentration.

No inelastic deformation has been taken into consideration in our method.

a question

Rui He — Wed, 21 Sep 2011 08:41:14 -0400

Hello, Yuhang, I have read your paper, it's a good method, and I wonder whether your method can be used to determine the poroelastic constants of the saturated soil ?

Thank You Prof. Suo

Dibakar Datta — Tue, 13 Sep 2011 12:17:37 -0400

Dear Prof. Suo,

Thank you very much for sharing your work. I really enjoyed your recent talk in June at Brown University .

Regards,
Dibakar Datta
Email : dibakar_datta@brown.edu
PhD Student ; Major : Solid Mechanics
Shenoy Research Group
Brown University
Providence 02912 , USA