sfepy/sfepy — Issue #150: Develop term for concentrated point loads
Author: rc
Created: 2012-01-30 10:27:26+00:00
State: open

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.

Migrated from http://code.google.com/p/sfepy/issues/detail?id=148

earlier comments

robert.cimrman said, at 2010-12-14T10:39:29.000Z:

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?

robert.cimrman said, at 2012-01-01T12:04:12.000Z:

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