Can not find the source of the damping coefficient expression of Hertz-Mindlin (no slip) model in the EDEM help

Hi all,

I am checking the contact model used in the software. But I find the contact model in the EDEM help file, where the damping coefficient is different from all the references listed. I can not understand what is the constant item at the begining of the expression of Hertz-Mindlin (no slip) model. Can anyone explain or give me a reference about this?

Thanks!

https://2022.help.altair.com/2022.1/EDEM/index.htm#t=Creator/Physics/Base_Models/Hertz-Mindlin_(no_slip.htm&rhsearch=damping

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Stephen Cole

Hi Chandler,

You can find the references for the EDEM models here:

https://help.altair.com/edem/Bibliography.htm

Regards

Stephen

chandler

Hi Chandler,

You can find the references for the EDEM models here:

https://help.altair.com/edem/Bibliography.htm

Regards

Stephen

Hi Stephen,

Thank you for the reply.

I checked those references, but I didn't find this expression used by EDEM software in those papers. Can you please give a specific reference where the damping coefficient that I attached in the previous question comes from? We need it when we are writing papers about the simulation by EDEM.

Best

Chandler

Stephen Cole

Hi Stephen,

Thank you for the reply.

I checked those references, but I didn't find this expression used by EDEM software in those papers. Can you please give a specific reference where the damping coefficient that I attached in the previous question comes from? We need it when we are writing papers about the simulation by EDEM.

Best

Chandler

Hi,

You can check:

Ning, Z., Ghadiri, M.: Incorporation of Rayleigh damping into TRUBAL and determination of the critical time step. (1996)

Abbaspour-Fard, M. H. ( 2000). “Discrete element modelling of the dynamic behaviour of non-spherical particulate materials.” PhD thesis, University of Newcastle, Newcastle upon Tyne, U.K.

Regards

Stephen

chandler

This is helpful. Thank you very much, Stephen.