New question #269724 on Yade:
https://answers.launchpad.net/yade/+question/269724

Hello everybody!

I'm so sorry about my lack of knowledge but i'm trying to understand what type 
of interactions are used in CpmMat:

1) Is CpmMat a bonded particle model (BPM) which is described for example in "A 
bonded-particle model for rock"
D.O. Potyondya, P.A. Cundall. 
(http://mech.spbstu.ru/images/b/bd/Potyondy_Cundall_2004_A_bonded-particle_model_for_rock.pdf).
 Generally, are all models in yade that support cohesion can be viewed like BMP?

2) If first is true, does CpmMat use contact bond model or beam bond mode, like 
here (http://i10.pixs.ru/storage/0/9/8/picPNG_2192511_18182098.png).

3) Do i understand correctly for CpmMat that:
a) cohesive contact is created only at the beginning before simulation has been 
started?
b) during simulation new cohesion contacts aren't created only old can be 
broken?

3) Is it possible to use CpmMat for modeling damages (e.g. break on tension) 
for metallic and composite materials (not concrete and rock)? (I mean that 
concrete and metal have different behavior under tensile load because metal is 
streched fist and concrete breaks immediately) .

with regards, Alexander

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