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[Bruno Chareyre <question280376@xxxxxxxxxxxxxxxxxxxxx>]

Question #280376 on Yade changed:
https://answers.launchpad.net/yade/+question/280376

Bruno Chareyre posted a new comment:
Hi, sorry for late remark but I think this paper [1] is relevant to your question.
It shows an example of a deformable potatoe (spherical potatoe in the example but it is not a restriction).
Also an example of a flexible membrane and of a tube.
By now this code should be available. Else it will happen shortly.

Clearly, a difficulty is to relate the elastic properties of a continuous potatoe to that of the model, since it simulates hollow objects with sort of shell elements instead of volume elements. I don't think filling the potatoe with overlapping spheres make this problem easier though. 
Regards
Bruno

[1] http://www.sciencedirect.com/science/article/pii/S0266114415001235

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