Develop term for concentrated point loads

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We have a surface traction term that can be applied to surfaces for 3D models 
and edges for 2D models. Similarly, we need a "line traction" term that can be 
applied to edges for 3D models and points for 2D models.

I remember years back applying a simple conversion where a edge load is 
converted to point loads concentrated at the nodes along the edge.

The current formulation is perfect for strain-controlled tests but a term to 
apply point loads would be useful for stress-controlled tests. 

Original issue reported on code.google.com by freevryh...@gmail.com on 13 Dec 2010 at 6:54

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I agree that having those terms is useful.

If you need to simulate stress-controlled tests, you can proceed IMHO even now 
as follows:

- if you need to apply stress, dw_surface_ltr is ok.
- if you need to apply force F:
  - the load is applied to some surface region (right?), so use d_surface to compute the surface S of the region, get the stress as F/S and use dw_surface_ltr

Does it help?

Original comment by robert.c...@gmail.com on 14 Dec 2010 at 10:39

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There is new dw_point_load now (quite easy to implement!).

Original comment by robert.c...@gmail.com on 1 Jan 2012 at 12:04

• Changed state: Fixed

[GoogleCodeExporter]

Migrated to http://github.com/sfepy/sfepy/issues/150

Original comment by robert.c...@gmail.com on 30 Jan 2012 at 10:27

• Changed state: Migrated