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[jduriez <jerome.duriez@xxxxxxxxxxxxxxx>]

Hi,

I committed finally some change [1], that I began before your
assignment, Jan. For the examples script above, the results seem indeed
now identical (provided that NewtonIntegrator is put after
UniaxialStrainer in the list of engines of testUS.py).

Feel free to test/change it more, Jan. (for me I guess I will not use
much more this engine)

Jérôme

[1] :
https://github.com/yade/trunk/commit/50727a206bda1ff0129b391ef16daa5cc659ef3c

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https://bugs.launchpad.net/bugs/1300167

Title:
  (Not) Defining velocities in UniaxialStrainer ?

Status in Yet Another Dynamic Engine:
  New

Bug description:
  Hi,

  I have the feeling that there is something "wrong" with
  UniaxialStrainer where the velocities of the "posIds" and "negIds"
  bodies are not defined, and I illustrate it with following examples
  (attached)

  It deals with 2 contacting spheres, with an oblic contact. One sphere is moved towards the 2d sphere, and here both normal and tangential relative displacements occur. 
  - In testUS.py the moving sphere is moved through UniaxialStrainer
  - Whereas in testUSb.py the movement comes from an initial value of velocity (and NewtonIntegrator)

  And, obviously, the two simulations are different (see e.g. the plot
  of fZ sustained by moving sphere). While I would tend to consider
  these two simulations as identical.

  What do you think ?

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