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[Jan Stránský <question247006@xxxxxxxxxxxxxxxxxxxxx>]

Question #247006 on Yade changed:
https://answers.launchpad.net/yade/+question/247006

Jan Stránský proposed the following answer:
Hi Behzad,


> Jan;
>

this can be any developer :-)


> To start writing and compiling a new constitutive law, perhaps it's not a
> bad idea if I first have a look on the simple already implemented laws.
>

yes :-)


> for example where I can find the C++ files of a simple law of
> frictMat=frictMat contact?
>

the answer to your question is not so easy.. have a look at [1,2] chapters
in user's manual. For the standard basic case:
- when two bodies newly interct:
- Firstly Ig2  (e.g. Ig2_Sphere_Sphere_ScGeom) functor is called creating
geometric properties of the interaction from bodies' Shapes.
- these properties are stored in IGeom instace, belonging to interaction
(in this case ScGeom)
- then Ip2 functor is called, in this case Ip2_FrictMat_FrictMat_FrictPhys.
It take the two bodies' Materials and create new IPhys (specifically
FrictPhys) instance.
- IPhys stores variables specific for the interaction physics (could be
e.g. material parameter like internal friction angle - same for all
interactions - but also internal variables like plastic strain - different
for every interaction -etc.)
- for forces evaluation, you need Law2 functor (in this case
Law2_ScGeom_FrictPhys_CundallStrack) combining IGeom and IPhys of the
interaction and computing forces, that are then used by NewtonIntegrator

Files related to the example:
pkg/common/Sphere.xpp
pkg/dem/Ig2_Sphere_Sphere_ScGeom.xpp
pkg/dem/ScGeom.xpp
pkg/common/ElastMat.xpp
pkg/dem/Ip2_FrictMat_FrictMat_FrictPhys.xpp
pkg/dem/FrictPhys.xpp
pkg/dem/ElasticContactLaw.xpp


Let's say I modify this, then how do I compile it?
>

See [3]. After a modification, recompile yade by 'make' and 'make install'
commands

in case of any problem, write us, we will try to help
cheers
Jan

[1] https://yade-dem.org/doc/user.html#creating-interactions
[2] https://yade-dem.org/doc/user.html#base-engines
[3] https://yade-dem.org/doc/installation.html#source-code

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