Yade

The parameter (en, es )of the DMT model

Asked by zhao dejin

Hi , yade users :
      recently, I'm doing the DEM simulation of the stainless steel, the DMT model must be considered. However , I fail to find the effective parameters of the material, such as gamma, en, es. If someone did the research of this material or somebody can provide me some paper about it . Thanks in advance.
     Best wishes
    ZDJ

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Chiara Modenese
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Chiara Modenese (chiara-modenese) said : 		#1

Hi,

If you are looking to use the DMT model for adhesive particles, this is a simple extension of the Hertz Mindlin formulation. The Hertzian contact relationship is shifted down by the adhesive force. You can check this on the literature, or at page 39, 40 of my PhD thesis [*].

The adhesive force should already be implemented in the current version of the HertzMindlin.cpp contact law and it is a function of gamma. Apologies if this has not been documented properly but it should work fine if you are familiar with Yade. If you need further assistance, let me know and I can provide you with a sample script.

HTH,
Chiara
[*] http://www.eng.ox.ac.uk/civil/publications/theses/modenese_pdf

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zhao dejin (515jingege) said : 		#2

Hi,
Thanks ,Chiara, I have read your PhD thesis yet ,It's really a wonderful work and thanks to your work ,I am familiar with the DMT model . Three parameter are need in the DMT model of YADE, such as gamma ,en ,es. But I failed to find the effective valus of the 316L stainless steel which is the material I have studied .So I turn to someone did the research of this material for help.Thanks again.

Best wishes
ZDJ

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Best Chiara Modenese (chiara-modenese) said : 		#3

Hi,

Glad to know the work has been useful.

Surface energy (gamma) is a measurable material parameter, and also an input of the DMT model. You need to find out what the typical value(s) is for your material based on the relevant literature (sorry but I can't help you directly with this).

For the damping coefficients, en and es, these are there to replicate dissipation forces, which you will need to calibrate in your model against experimental values, depending on the purpose of your DEM simulations.

I hope this is of help,
Chiara

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zhao dejin (515jingege) said : 		#4

Thanks Chiara Modenese, that solved my question.