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add Van der Waals force into the Hertz-Mindlin model

Asked by zhao dejin

Dear all:

Hi, recently, I did some research about the selective laser welding, and I intend to simulate the motion of the particles in this process. According to other research's paper, non linear contact law type Hertz-Mindlin between the spheres is suitable for the model. However, when the particle size is less than 100 μm, the effect of Van der Waals force is necessary to be considered, so I want to know if there is possible to add Van der Waals force into the Hertz-Mindlin model ,just like the 'Hertz-Mindlin with JKR cohesion' in EDEM.

Thanks for any tips and advice!
 zdj

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Bruno Chareyre
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Bruno Chareyre (bruno-chareyre) said : 		#1

Hi,
The JKR model is not implemented currently but with relatively limited efforts (with examples from existing functors) you could code it. Let us know if you need guidance.
Bruno

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zhao dejin (515jingege) said : 		#2

Hi,Bruno：
Thanks for your replay. I really appreciate it if you can guide me how to do it !

Thanks again!
zdj

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Best Bruno Chareyre (bruno-chareyre) said : 		#3

Where should we start? :)
Did you read the documentation?
If so what about jumping on an existing contact model and experimenting how to play/modify it to your needs?
I guess [1] is a relevant starting point.
Bruno

[1] https://github.com/yade/trunk/blob/master/pkg/dem/CohesiveFrictionalContactLaw.hpp

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zhao dejin (515jingege) said : 		#4

Thanks Bruno Chareyre, that solved my question.